<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      width: 100%;
      height: 100%;
      background: #ffffff;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px;
      user-select: none;
    }
    .diagram-svg {
      width: 100%;
      max-width: 500px;
      height: auto;
      display: block;
    }
    .balance-pill {
      margin-top: 10px;
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      padding: 6px 16px;
      border-radius: 9999px;
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .val-left { color: #2563eb; }
    .val-right { color: #2563eb; }
    .equal-sign { color: #64748b; }
  </style>
</head>
<body>

  <svg class="diagram-svg" viewBox="0 0 500 270" aria-label="Number line balance diagram showing the mean at 4">
    <defs>
      
      <marker id="arrow-left" viewBox="0 0 10 10" refX="2" refY="5" markerWidth="6" markerHeight="6" orient="auto">
        <path d="M 8 1 L 2 5 L 8 9" fill="none" stroke="#2563eb" stroke-width="2" stroke-linecap="round" />
      </marker>
      <marker id="arrow-right" viewBox="0 0 10 10" refX="8" refY="5" markerWidth="6" markerHeight="6" orient="auto">
        <path d="M 2 1 L 8 5 L 2 9" fill="none" stroke="#2563eb" stroke-width="2" stroke-linecap="round" />
      </marker>
    </defs>

    
    
    <path d="M 205 76 C 205 46, 95 46, 95 76" fill="none" stroke="#2563eb" stroke-width="2" stroke-dasharray="4 4" marker-end="url(#arrow-left)" />
    <rect x="122" y="36" width="56" height="22" rx="11" fill="#eff6ff" stroke="#bfdbfe" stroke-width="1" />
    <text x="150" y="51" text-anchor="middle" font-size="12" font-weight="700" fill="#2563eb">Left: 3</text>

    
    <text x="210" y="70" text-anchor="middle" font-size="12" font-weight="700" fill="#64748b">Dist: 0</text>
    <line x1="210" y1="76" x2="210" y2="88" stroke="#94a3b8" stroke-width="1.5" stroke-dasharray="2 2" />

    
    <path d="M 215 76 C 215 46, 325 46, 325 76" fill="none" stroke="#2563eb" stroke-width="2" stroke-dasharray="4 4" marker-end="url(#arrow-right)" />
    <rect x="242" y="36" width="60" height="22" rx="11" fill="#eff6ff" stroke="#bfdbfe" stroke-width="1" />
    <text x="272" y="51" text-anchor="middle" font-size="12" font-weight="700" fill="#2563eb">Right: 3</text>

    
    
    <circle cx="90" cy="116" r="20" fill="#3b82f6" stroke="#1d4ed8" stroke-width="2" />
    <text x="90" y="121" text-anchor="middle" font-size="12" font-weight="700" fill="#ffffff">1 kg</text>

    
    <circle cx="210" cy="116" r="20" fill="#3b82f6" stroke="#1d4ed8" stroke-width="2" />
    <text x="210" y="121" text-anchor="middle" font-size="12" font-weight="700" fill="#ffffff">1 kg</text>

    
    <circle cx="330" cy="116" r="20" fill="#3b82f6" stroke="#1d4ed8" stroke-width="2" />
    <text x="330" y="121" text-anchor="middle" font-size="12" font-weight="700" fill="#ffffff">1 kg</text>

    
    <rect x="35" y="136" width="430" height="12" rx="6" fill="#334155" />

    
    
    
    <line x1="50" y1="148" x2="50" y2="155" stroke="#64748b" stroke-width="2" />
    <text x="50" y="172" text-anchor="middle" font-size="13" font-weight="600" fill="#64748b">0</text>
    
    <line x1="90" y1="148" x2="90" y2="155" stroke="#1e2945" stroke-width="2" />
    <text x="90" y="172" text-anchor="middle" font-size="13" font-weight="700" fill="#1e2945">1</text>
    
    <line x1="130" y1="148" x2="130" y2="155" stroke="#64748b" stroke-width="2" />
    <text x="130" y="172" text-anchor="middle" font-size="13" font-weight="600" fill="#64748b">2</text>
    
    <line x1="170" y1="148" x2="170" y2="155" stroke="#64748b" stroke-width="2" />
    <text x="170" y="172" text-anchor="middle" font-size="13" font-weight="600" fill="#64748b">3</text>
    
    <line x1="210" y1="148" x2="210" y2="155" stroke="#ef4444" stroke-width="2.5" />
    <text x="210" y="172" text-anchor="middle" font-size="14" font-weight="800" fill="#ef4444">4</text>
    
    <line x1="250" y1="148" x2="250" y2="155" stroke="#64748b" stroke-width="2" />
    <text x="250" y="172" text-anchor="middle" font-size="13" font-weight="600" fill="#64748b">5</text>
    
    <line x1="290" y1="148" x2="290" y2="155" stroke="#64748b" stroke-width="2" />
    <text x="290" y="172" text-anchor="middle" font-size="13" font-weight="600" fill="#64748b">6</text>
    
    <line x1="330" y1="148" x2="330" y2="155" stroke="#1e2945" stroke-width="2" />
    <text x="330" y="172" text-anchor="middle" font-size="13" font-weight="700" fill="#1e2945">7</text>
    
    <line x1="370" y1="148" x2="370" y2="155" stroke="#64748b" stroke-width="2" />
    <text x="370" y="172" text-anchor="middle" font-size="13" font-weight="600" fill="#64748b">8</text>
    
    <line x1="410" y1="148" x2="410" y2="155" stroke="#64748b" stroke-width="2" />
    <text x="410" y="172" text-anchor="middle" font-size="13" font-weight="600" fill="#64748b">9</text>
    
    <line x1="450" y1="148" x2="450" y2="155" stroke="#64748b" stroke-width="2" />
    <text x="450" y="172" text-anchor="middle" font-size="13" font-weight="600" fill="#64748b">10</text>

    
    <polygon points="210,148 186,192 234,192" fill="#ef4444" stroke="#dc2626" stroke-width="2" stroke-linejoin="round" />
    <circle cx="210" cy="155" r="2.5" fill="#ffffff" />

    
    <rect x="174" y="192" width="72" height="6" rx="3" fill="#cbd5e1" />
    <text x="210" y="216" text-anchor="middle" font-size="13" font-weight="800" fill="#ef4444">▲ Balance Point (Mean)</text>
  </svg>

  
  <div class="balance-pill">
    <span class="val-left">Left Dist: 3</span>
    <span class="equal-sign">=</span>
    <span class="val-right">Right Dist: 3</span>
    <span>⚖️</span>
  </div>

</body>
</html>

Understanding the Mean as Equal Sharing and Balance Point

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: #ffffff;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px 8px;
      min-height: 100%;
      user-select: none;
    }

    .main-stage {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      width: 100%;
      max-width: 480px;
    }

    .card-panel {
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      background: #f8fafc;
      border: 1px solid #e6e6e6;
      border-radius: 12px;
      padding: 10px 6px 12px;
      position: relative;
    }

    .panel-title {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 8px;
      color: #475569;
    }

    .tower-group {
      display: flex;
      align-items: flex-end;
      justify-content: center;
      gap: 8px;
      height: 160px;
      width: 100%;
      border-bottom: 2px solid #cbd5e1;
      padding-bottom: 2px;
      position: relative;
    }

    .mean-line {
      position: absolute;
      bottom: calc(2px + (4 * 20px));
      left: 0;
      right: 0;
      border-top: 2px dashed #94a3b8;
      pointer-events: none;
      z-index: 5;
    }

    .tower {
      display: flex;
      flex-direction: column-reverse;
      align-items: center;
      width: 28px;
      position: relative;
    }

    .cube {
      width: 26px;
      height: 18px;
      margin-bottom: 2px;
      border-radius: 3px;
      border: 1.5px solid rgba(0, 0, 0, 0.15);
      position: relative;
      transition: transform 0.4s ease, opacity 0.4s ease;
    }

    .cube::after {
      content: '';
      position: absolute;
      top: 2px;
      left: 3px;
      right: 3px;
      height: 3px;
      background: rgba(255, 255, 255, 0.45);
      border-radius: 2px;
    }

    .cube.blue { background: #3b82f6; }
    .cube.yellow { background: #f59e0b; }
    .cube.green { background: #10b981; }

    .cube.moved {
      box-shadow: 0 0 0 1.5px #2563eb inset;
    }

    .counts-row {
      display: flex;
      justify-content: center;
      gap: 8px;
      width: 100%;
      margin-top: 6px;
    }

    .count-tag {
      width: 28px;
      text-align: center;
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
    }

    .summary-badge {
      margin-top: 8px;
      font-size: 12px;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 6px;
      background: #e2e8f0;
      color: #334155;
    }

    .summary-badge.highlight {
      background: #dbeafe;
      color: #1d4ed8;
      border: 1px solid #bfdbfe;
    }

    .arrow-divider {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      color: #94a3b8;
      font-weight: 900;
      padding: 0 2px;
    }

    .toggle-bar {
      display: flex;
      gap: 8px;
      margin-top: 10px;
    }

    .btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      color: #1e2945;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .btn.active {
      background: #2563eb;
      color: #ffffff;
      border-color: #1d4ed8;
    }
  </style>
</head>
<body>

  <div class="main-stage">
    
    <div class="card-panel" id="panelBefore">
      <div class="panel-title">Before</div>
      <div class="tower-group">
        
        <div class="tower" id="beforeT1">
          <div class="cube blue"></div>
          <div class="cube blue"></div>
          <div class="cube blue"></div>
          <div class="cube blue"></div>
          <div class="cube blue transfer-source"></div>
          <div class="cube blue transfer-source"></div>
          <div class="cube blue transfer-source"></div>
        </div>
        
        <div class="tower" id="beforeT2">
          <div class="cube yellow"></div>
        </div>
        
        <div class="tower" id="beforeT3">
          <div class="cube green"></div>
          <div class="cube green"></div>
          <div class="cube green"></div>
          <div class="cube green"></div>
        </div>
      </div>
      <div class="counts-row">
        <div class="count-tag">7</div>
        <div class="count-tag">1</div>
        <div class="count-tag">4</div>
      </div>
      <div class="summary-badge">Total: 12</div>
    </div>

    
    <div class="arrow-divider">→</div>

    
    <div class="card-panel" id="panelAfter">
      <div class="panel-title">Equal Share</div>
      <div class="tower-group">
        <div class="mean-line"></div>
        
        <div class="tower">
          <div class="cube blue"></div>
          <div class="cube blue"></div>
          <div class="cube blue"></div>
          <div class="cube blue"></div>
        </div>
        
        <div class="tower">
          <div class="cube yellow"></div>
          <div class="cube blue moved"></div>
          <div class="cube blue moved"></div>
          <div class="cube blue moved"></div>
        </div>
        
        <div class="tower">
          <div class="cube green"></div>
          <div class="cube green"></div>
          <div class="cube green"></div>
          <div class="cube green"></div>
        </div>
      </div>
      <div class="counts-row">
        <div class="count-tag">4</div>
        <div class="count-tag">4</div>
        <div class="count-tag">4</div>
      </div>
      <div class="summary-badge highlight">Mean: 4</div>
    </div>
  </div>

  <div class="toggle-bar">
    <button class="btn active" id="btnFocus">✦ Level Out (12 ÷ 3 = 4)</button>
  </div>

  <script>
    const btn = document.getElementById('btnFocus');
    const movedCubes = document.querySelectorAll('.cube.moved');
    const sourceCubes = document.querySelectorAll('.transfer-source');
    let highlighted = true;

    function updateHighlight() {
      movedCubes.forEach(c => {
        c.style.transform = highlighted ? 'scale(1.08)' : 'scale(1)';
        c.style.boxShadow = highlighted ? '0 0 0 2px #f59e0b' : 'none';
      });
      sourceCubes.forEach(c => {
        c.style.transform = highlighted ? 'scale(1.08)' : 'scale(1)';
        c.style.boxShadow = highlighted ? '0 0 0 2px #f59e0b' : 'none';
      });
    }

    btn.addEventListener('click', () => {
      highlighted = !highlighted;
      btn.classList.toggle('active', highlighted);
      updateHighlight();
    });

    updateHighlight();
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #1e2945;
      padding: 12px;
      user-select: none;
      -webkit-user-select: none;
    }
    .header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 10px;
    }
    .title {
      font-size: 16px;
      font-weight: 700;
      color: #0f172a;
    }
    .key-box {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      padding: 4px 10px;
      border-radius: 9999px;
      font-size: 13px;
      font-weight: 600;
    }
    .key-item {
      display: flex;
      align-items: center;
      gap: 5px;
    }
    .chart {
      display: flex;
      flex-direction: column;
      gap: 8px;
      margin-bottom: 12px;
    }
    .team-row {
      display: grid;
      grid-template-columns: 95px 1fr auto;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 10px;
      padding: 6px 10px;
      cursor: pointer;
      transition: background-color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    }
    .team-row:hover {
      background: #f8fafc;
    }
    .team-row.active {
      background: #eff6ff;
      border-color: #3b82f6;
      box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.25);
    }
    .badge {
      display: inline-block;
      text-align: center;
      padding: 4px 8px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.2px;
    }
    .badge-red { background: #fee2e2; color: #b91c1c; }
    .badge-blue { background: #dbeafe; color: #1d4ed8; }
    .badge-green { background: #dcfce7; color: #15803d; }
    .badge-yellow { background: #fef9c3; color: #a16207; }

    .apples-cell {
      display: flex;
      align-items: center;
      gap: 6px;
      min-height: 28px;
    }
    .apple-icon {
      width: 24px;
      height: 24px;
      flex-shrink: 0;
      display: inline-block;
    }
    .apple-half {
      width: 14px;
      height: 24px;
      flex-shrink: 0;
      display: inline-block;
    }
    .total-cell {
      display: flex;
      flex-direction: column;
      align-items: flex-end;
      min-width: 54px;
    }
    .total-num {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
    }
    .calc-pill {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
    }

    .equation-bar {
      background: #f8fafc;
      border: 1.5px solid #cbd5e1;
      border-radius: 8px;
      padding: 8px 12px;
      display: flex;
      flex-direction: column;
      gap: 3px;
      transition: border-color 0.2s ease;
    }
    .eq-main {
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
    }
    .eq-sub {
      font-size: 12px;
      font-weight: 600;
      color: #2563eb;
    }
    svg {
      display: block;
      width: 100%;
      height: 100%;
    }
  </style>
</head>
<body>

  
  <svg style="display: none;">
    <defs>
      <g id="svg-apple-full">
        
        <path d="M12 8 C12 4 14 2 16 2" stroke="#78350f" stroke-width="2" fill="none" stroke-linecap="round"/>
        
        <ellipse cx="15" cy="4" rx="2.5" ry="1.5" transform="rotate(-30 15 4)" fill="#22c55e"/>
        
        <circle cx="9" cy="14" r="6" fill="#ef4444"/>
        <circle cx="15" cy="14" r="6" fill="#ef4444"/>
        <ellipse cx="12" cy="15" rx="6.5" ry="6" fill="#ef4444"/>
      </g>
      <clipPath id="left-half-clip">
        <rect x="0" y="0" width="12" height="24"/>
      </clipPath>
    </defs>
  </svg>

  <div class="header">
    <div class="title">Apples Picked by Teams</div>
    <div class="key-box">
      <span class="key-item">
        <span class="apple-icon">
          <svg viewBox="0 0 24 24"><use href="#svg-apple-full"/></svg>
        </span>
        = 10
      </span>
      <span class="key-item">
        <span class="apple-half">
          <svg viewBox="0 0 12 24">
            <g clip-path="url(#left-half-clip)">
              <use href="#svg-apple-full"/>
            </g>
          </svg>
        </span>
        = 5
      </span>
    </div>
  </div>

  <div class="chart" id="teamList">
    
    <div class="team-row" data-index="0">
      <span class="badge badge-red">Team Red</span>
      <div class="apples-cell">
        <span class="apple-icon"><svg viewBox="0 0 24 24"><use href="#svg-apple-full"/></svg></span>
        <span class="apple-icon"><svg viewBox="0 0 24 24"><use href="#svg-apple-full"/></svg></span>
        <span class="apple-icon"><svg viewBox="0 0 24 24"><use href="#svg-apple-full"/></svg></span>
      </div>
      <div class="total-cell">
        <span class="total-num">30</span>
        <span class="calc-pill">3 × 10</span>
      </div>
    </div>

    
    <div class="team-row active" data-index="1">
      <span class="badge badge-blue">Team Blue</span>
      <div class="apples-cell">
        <span class="apple-icon"><svg viewBox="0 0 24 24"><use href="#svg-apple-full"/></svg></span>
        <span class="apple-icon"><svg viewBox="0 0 24 24"><use href="#svg-apple-full"/></svg></span>
        <span class="apple-half">
          <svg viewBox="0 0 12 24">
            <g clip-path="url(#left-half-clip)">
              <use href="#svg-apple-full"/>
            </g>
          </svg>
        </span>
      </div>
      <div class="total-cell">
        <span class="total-num">25</span>
        <span class="calc-pill">20 + 5</span>
      </div>
    </div>

    
    <div class="team-row" data-index="2">
      <span class="badge badge-green">Team Green</span>
      <div class="apples-cell">
        <span class="apple-icon"><svg viewBox="0 0 24 24"><use href="#svg-apple-full"/></svg></span>
        <span class="apple-icon"><svg viewBox="0 0 24 24"><use href="#svg-apple-full"/></svg></span>
        <span class="apple-icon"><svg viewBox="0 0 24 24"><use href="#svg-apple-full"/></svg></span>
        <span class="apple-icon"><svg viewBox="0 0 24 24"><use href="#svg-apple-full"/></svg></span>
      </div>
      <div class="total-cell">
        <span class="total-num">40</span>
        <span class="calc-pill">4 × 10</span>
      </div>
    </div>

    
    <div class="team-row" data-index="3">
      <span class="badge badge-yellow">Team Yellow</span>
      <div class="apples-cell">
        <span class="apple-icon"><svg viewBox="0 0 24 24"><use href="#svg-apple-full"/></svg></span>
        <span class="apple-half">
          <svg viewBox="0 0 12 24">
            <g clip-path="url(#left-half-clip)">
              <use href="#svg-apple-full"/>
            </g>
          </svg>
        </span>
      </div>
      <div class="total-cell">
        <span class="total-num">15</span>
        <span class="calc-pill">10 + 5</span>
      </div>
    </div>
  </div>

  <div class="equation-bar" id="eqBar">
    <div class="eq-main" id="eqMain">Team Blue: (2 × 10) + (10 ÷ 2) = 20 + 5 = 25 apples</div>
    <div class="eq-sub" id="eqSub">Half symbol = 10 ÷ 2 = 5 apples</div>
  </div>

  <script>
    const teamData = [
      {
        name: "Team Red",
        main: "Team Red: 3 × 10 = 30 apples",
        sub: "3 whole symbols × 10 each = 30 apples"
      },
      {
        name: "Team Blue",
        main: "Team Blue: (2 × 10) + (10 ÷ 2) = 20 + 5 = 25 apples",
        sub: "Half symbol = 10 ÷ 2 = 5 apples"
      },
      {
        name: "Team Green",
        main: "Team Green: 4 × 10 = 40 apples",
        sub: "4 whole symbols × 10 each = 40 apples"
      },
      {
        name: "Team Yellow",
        main: "Team Yellow: (1 × 10) + (10 ÷ 2) = 10 + 5 = 15 apples",
        sub: "Half symbol = 10 ÷ 2 = 5 apples"
      }
    ];

    const rows = document.querySelectorAll('.team-row');
    const eqMain = document.getElementById('eqMain');
    const eqSub = document.getElementById('eqSub');

    rows.forEach((row) => {
      row.addEventListener('click', () => {
        rows.forEach(r => r.classList.remove('active'));
        row.classList.add('active');
        const idx = parseInt(row.getAttribute('data-index'), 10);
        eqMain.textContent = teamData[idx].main;
        eqSub.textContent = teamData[idx].sub;
      });
    });
  </script>
</body>
</html>

Reading Scaled Pictographs with Many-to-One Keys

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background-color: #f8fafc;
      color: #1e293b;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      width: 100%;
      min-height: 100%;
    }

    /* Key Section */
    .key-card {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 12px 14px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }
    .badge {
      align-self: flex-start;
      background: #fff7ed;
      color: #c2410c;
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      padding: 2px 8px;
      border-radius: 6px;
      border: 1px solid #fed7aa;
    }
    .key-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      flex-wrap: wrap;
      width: 100%;
    }
    .symbol-box {
      display: flex;
      flex-direction: column;
      align-items: center;
      background: #fff7ed;
      border: 1.5px dashed #f97316;
      border-radius: 10px;
      padding: 6px 14px;
    }
    .symbol-icon {
      font-size: 32px;
      line-height: 1.1;
    }
    .symbol-sub {
      font-size: 12px;
      font-weight: 700;
      color: #ea580c;
    }
    .equals-sign {
      font-size: 22px;
      font-weight: 800;
      color: #94a3b8;
    }
    .actual-group {
      display: flex;
      flex-direction: column;
      align-items: center;
      background: #f1f5f9;
      border: 1.5px solid #cbd5e1;
      border-radius: 10px;
      padding: 6px 12px;
    }
    .actual-slices {
      display: flex;
      gap: 4px;
    }
    .actual-icon {
      font-size: 20px;
      line-height: 1.1;
    }
    .actual-sub {
      font-size: 12px;
      font-weight: 700;
      color: #475569;
    }
    .key-caption {
      font-size: 13px;
      font-weight: 700;
      color: #334155;
    }
    .key-caption span {
      color: #ea580c;
    }

    /* Interactive Scaled Section */
    .calc-card {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 12px 14px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
      flex: 1;
    }
    .selector-row {
      display: flex;
      align-items: center;
      gap: 6px;
      background: #f1f5f9;
      padding: 4px;
      border-radius: 8px;
    }
    .selector-label {
      font-size: 12px;
      font-weight: 700;
      color: #64748b;
      padding: 0 4px;
    }
    .count-btn {
      background: transparent;
      border: none;
      font-size: 13px;
      font-weight: 700;
      color: #475569;
      padding: 4px 10px;
      border-radius: 6px;
      cursor: pointer;
      transition: background 0.15s ease, color 0.15s ease;
    }
    .count-btn.active {
      background: #f97316;
      color: #ffffff;
      box-shadow: 0 2px 4px rgba(249, 115, 22, 0.25);
    }

    /* Symbol Grid & Groups */
    .visual-breakdown {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      width: 100%;
    }
    .symbol-row-display {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 8px;
      min-height: 40px;
      flex-wrap: wrap;
    }
    .symbol-pill {
      background: #fff7ed;
      border: 1px solid #fed7aa;
      border-radius: 8px;
      padding: 4px 8px;
      font-size: 22px;
      line-height: 1;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .groups-container {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 6px;
      flex-wrap: wrap;
      width: 100%;
    }
    .slice-cluster {
      display: flex;
      align-items: center;
      gap: 2px;
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 3px 5px;
      font-size: 15px;
    }

    /* Math Equation Banner */
    .equation-banner {
      background: #fff7ed;
      border: 1.5px solid #fed7aa;
      border-radius: 8px;
      padding: 6px 14px;
      font-size: 14px;
      font-weight: 700;
      color: #9a3412;
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: 0.02em;
    }
    .highlight-val {
      color: #ea580c;
      font-size: 16px;
      font-weight: 800;
    }
  </style>
</head>
<body>

  
  <div class="key-card">
    <div class="badge">KEY</div>
    <div class="key-row">
      <div class="symbol-box">
        <span class="symbol-icon">🍕</span>
        <span class="symbol-sub">1 Symbol</span>
      </div>
      <div class="equals-sign">=</div>
      <div class="actual-group">
        <div class="actual-slices">
          <span class="actual-icon">🍕</span>
          <span class="actual-icon">🍕</span>
          <span class="actual-icon">🍕</span>
          <span class="actual-icon">🍕</span>
        </div>
        <span class="actual-sub">4 Actual Slices</span>
      </div>
    </div>
    <div class="key-caption">Key: <span>1 symbol</span> = <span>4 slices</span></div>
  </div>

  
  <div class="calc-card">
    <div class="selector-row">
      <span class="selector-label">Symbols:</span>
      <button class="count-btn" onclick="setCount(1)">1</button>
      <button class="count-btn" onclick="setCount(2)">2</button>
      <button class="count-btn active" onclick="setCount(3)">3</button>
      <button class="count-btn" onclick="setCount(4)">4</button>
    </div>

    <div class="visual-breakdown">
      
      <div class="symbol-row-display" id="symbolRow">
        <span class="symbol-pill">🍕</span>
        <span class="symbol-pill">🍕</span>
        <span class="symbol-pill">🍕</span>
      </div>

      
      <div class="groups-container" id="groupsContainer">
        <div class="slice-cluster">🍕🍕🍕🍕</div>
        <div class="slice-cluster">🍕🍕🍕🍕</div>
        <div class="slice-cluster">🍕🍕🍕🍕</div>
      </div>
    </div>

    
    <div class="equation-banner" id="equationBanner">
      <span id="symCountText">3 symbols</span>
      <span>=</span>
      <span id="multText">3 × 4</span>
      <span>=</span>
      <span class="highlight-val" id="totalText">12 slices</span>
    </div>
  </div>

  <script>
    function setCount(n) {
      // Update active button
      const btns = document.querySelectorAll('.count-btn');
      btns.forEach((btn, idx) => {
        if (idx + 1 === n) {
          btn.classList.add('active');
        } else {
          btn.classList.remove('active');
        }
      });

      // Update symbols row
      const symbolRow = document.getElementById('symbolRow');
      let symbolsHtml = '';
      for (let i = 0; i < n; i++) {
        symbolsHtml += '<span class="symbol-pill">🍕</span>';
      }
      symbolRow.innerHTML = symbolsHtml;

      // Update groups breakdown
      const groupsContainer = document.getElementById('groupsContainer');
      let groupsHtml = '';
      for (let i = 0; i < n; i++) {
        groupsHtml += '<div class="slice-cluster">🍕🍕🍕🍕</div>';
      }
      groupsContainer.innerHTML = groupsHtml;

      // Update equation text
      const total = n * 4;
      document.getElementById('symCountText').textContent = n === 1 ? '1 symbol' : n + ' symbols';
      document.getElementById('multText').textContent = n + ' × 4';
      document.getElementById('totalText').textContent = total + ' slices';
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <title>Scaled Pictograph Key Guide</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #1e2945;
      padding: 12px 16px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 16px;
      min-height: 100%;
    }

    .row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      width: 100%;
    }

    /* Top Comparison Cards */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
      width: 100%;
      max-width: 540px;
      margin: 0 auto;
    }

    .compare-col {
      background: #f8fafc;
      border: 1.5px solid #e2e8f0;
      border-radius: 14px;
      padding: 12px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      text-align: center;
    }

    .title-label {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
    }

    .book-icon-box {
      width: 100px;
      height: 60px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .book-svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 4px 10px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 700;
      background: #e0f2fe;
      color: #0284c7;
      border: 1px solid #bae6fd;
      white-space: nowrap;
    }

    /* Bottom Worked Example */
    .calc-panel {
      background: #f0f9ff;
      border: 1.5px dashed #7dd3fc;
      border-radius: 14px;
      padding: 12px 10px;
      width: 100%;
      max-width: 540px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .calc-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      flex-wrap: nowrap;
    }

    .item-group {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
    }

    .mini-book {
      width: 64px;
      height: 40px;
    }

    .op {
      font-size: 18px;
      font-weight: 800;
      color: #64748b;
      margin-bottom: 16px;
    }

    .tag {
      font-size: 13px;
      font-weight: 700;
      color: #64748b;
    }

    .result-group {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      margin-bottom: 2px;
    }

    .total-val {
      font-size: 20px;
      font-weight: 800;
      color: #0284c7;
      line-height: 1.1;
    }

    .total-lbl {
      font-size: 12px;
      font-weight: 700;
      color: #0f172a;
      white-space: nowrap;
    }

    @media (max-width: 400px) {
      .compare-grid { gap: 8px; }
      .compare-col { padding: 10px 6px; }
      .book-icon-box { width: 84px; height: 50px; }
      .title-label { font-size: 14px; }
      .badge { font-size: 12px; padding: 3px 8px; }
      .mini-book { width: 48px; height: 32px; }
      .op { font-size: 16px; margin-bottom: 14px; }
      .tag { font-size: 12px; }
      .total-val { font-size: 18px; }
      .total-lbl { font-size: 11px; }
    }
  </style>
</head>
<body>

  
  <div class="compare-grid">
    
    <div class="compare-col">
      <div class="title-label">1 Full Symbol</div>
      <div class="book-icon-box">
        <svg class="book-svg" viewBox="0 0 100 64" fill="none" xmlns="http://www.w3.org/2000/svg">
          
          <path d="M50 56 C34 56 16 52 8 46 L8 14 C16 20 34 24 50 24 Z" fill="#0284c7" stroke="#0369a1" stroke-width="1.5" stroke-linejoin="round"/>
          <path d="M16 26 C24 29 36 31 44 32" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round" stroke-opacity="0.8"/>
          <path d="M16 34 C24 37 36 39 44 40" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round" stroke-opacity="0.8"/>
          
          <path d="M50 56 C66 56 84 52 92 46 L92 14 C84 20 66 24 50 24 Z" fill="#38bdf8" stroke="#0284c7" stroke-width="1.5" stroke-linejoin="round"/>
          <path d="M84 26 C76 29 64 31 56 32" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round" stroke-opacity="0.8"/>
          <path d="M84 34 C76 37 64 39 56 40" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round" stroke-opacity="0.8"/>
          
          <path d="M50 24 L50 56" stroke="#0f172a" stroke-width="2" stroke-linecap="round"/>
        </svg>
      </div>
      <div class="badge">= 8 books</div>
    </div>

    
    <div class="compare-col">
      <div class="title-label">½ Symbol</div>
      <div class="book-icon-box">
        <svg class="book-svg" viewBox="0 0 100 64" fill="none" xmlns="http://www.w3.org/2000/svg">
          
          <path d="M50 56 C34 56 16 52 8 46 L8 14 C16 20 34 24 50 24 Z" fill="#0284c7" stroke="#0369a1" stroke-width="1.5" stroke-linejoin="round"/>
          <path d="M16 26 C24 29 36 31 44 32" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round" stroke-opacity="0.8"/>
          <path d="M16 34 C24 37 36 39 44 40" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round" stroke-opacity="0.8"/>
          
          <path d="M50 56 C66 56 84 52 92 46 L92 14 C84 20 66 24 50 24 Z" fill="#f1f5f9" stroke="#cbd5e1" stroke-width="1.5" stroke-dasharray="3 3" stroke-linejoin="round"/>
          
          <path d="M50 12 L50 58" stroke="#94a3b8" stroke-width="2" stroke-dasharray="3 3" stroke-linecap="round"/>
          
          <text x="44" y="10" font-size="12" fill="#64748b">✂</text>
        </svg>
      </div>
      <div class="badge">8 ÷ 2 = 4 books</div>
    </div>
  </div>

  
  <div class="calc-panel">
    <div class="calc-row">
      
      <div class="item-group">
        <svg class="mini-book" viewBox="0 0 100 64" fill="none">
          <path d="M50 56 C34 56 16 52 8 46 L8 14 C16 20 34 24 50 24 Z" fill="#0284c7" stroke="#0369a1" stroke-width="1.5"/>
          <path d="M50 56 C66 56 84 52 92 46 L92 14 C84 20 66 24 50 24 Z" fill="#38bdf8" stroke="#0284c7" stroke-width="1.5"/>
          <path d="M50 24 L50 56" stroke="#0f172a" stroke-width="2"/>
        </svg>
        <span class="tag">8</span>
      </div>

      <div class="op">+</div>

      
      <div class="item-group">
        <svg class="mini-book" viewBox="0 0 100 64" fill="none">
          <path d="M50 56 C34 56 16 52 8 46 L8 14 C16 20 34 24 50 24 Z" fill="#0284c7" stroke="#0369a1" stroke-width="1.5"/>
          <path d="M50 56 C66 56 84 52 92 46 L92 14 C84 20 66 24 50 24 Z" fill="#38bdf8" stroke="#0284c7" stroke-width="1.5"/>
          <path d="M50 24 L50 56" stroke="#0f172a" stroke-width="2"/>
        </svg>
        <span class="tag">8</span>
      </div>

      <div class="op">+</div>

      
      <div class="item-group">
        <svg class="mini-book" viewBox="0 0 100 64" fill="none">
          <path d="M50 56 C34 56 16 52 8 46 L8 14 C16 20 34 24 50 24 Z" fill="#0284c7" stroke="#0369a1" stroke-width="1.5"/>
          <path d="M50 56 C66 56 84 52 92 46 L92 14 C84 20 66 24 50 24 Z" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5" stroke-dasharray="3 3"/>
          <path d="M50 24 L50 56" stroke="#94a3b8" stroke-width="2" stroke-dasharray="3 3"/>
        </svg>
        <span class="tag">4</span>
      </div>

      <div class="op">=</div>

      
      <div class="result-group">
        <div class="total-val">20</div>
        <div class="total-lbl">books total</div>
      </div>
    </div>
  </div>

</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #1e2945;
      padding: 16px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .plot-card {
      width: 100%;
      max-width: 440px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .title {
      font-size: 17px;
      font-weight: 700;
      text-align: center;
      color: #1e2945;
      letter-spacing: -0.01em;
    }

    /* Plot Table Structure */
    .plot-table {
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      overflow: hidden;
      background: #ffffff;
    }

    .plot-header {
      display: grid;
      grid-template-columns: 80px 1fr;
      background: #f8fafc;
      border-bottom: 2px solid #e2e8f0;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: #64748b;
    }

    .plot-header > div {
      padding: 8px 14px;
    }

    .plot-header > div:first-child {
      text-align: center;
      border-right: 2px solid #cbd5e1;
    }

    .plot-row {
      display: grid;
      grid-template-columns: 80px 1fr;
      border-bottom: 1px solid #f1f5f9;
      align-items: center;
      transition: background-color 0.2s ease;
    }

    .plot-row:last-child {
      border-bottom: none;
    }

    .plot-row:hover {
      background: #f8fafc;
    }

    .stem-col {
      display: flex;
      justify-content: center;
      align-items: center;
      padding: 8px 0;
      border-right: 2px solid #cbd5e1;
    }

    .stem-badge {
      background: #dbeafe;
      color: #1d4ed8;
      font-weight: 700;
      font-size: 15px;
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 8px;
    }

    .leaf-col {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 8px;
      padding: 8px 14px;
    }

    .leaf-btn {
      appearance: none;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      color: #1e2945;
      font-family: inherit;
      font-size: 15px;
      font-weight: 600;
      width: 30px;
      height: 30px;
      border-radius: 6px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      user-select: none;
      transition: background-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
    }

    .leaf-btn:hover {
      background: #e2e8f0;
    }

    .leaf-btn.active {
      background: #1d4ed8;
      color: #ffffff;
      border-color: #1d4ed8;
      box-shadow: 0 2px 4px rgba(29, 78, 216, 0.25);
    }

    /* Footer Meta Area */
    .footer-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
      font-size: 13px;
    }

    .key-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      padding: 6px 10px;
      border-radius: 8px;
      font-weight: 500;
      color: #1e2945;
    }

    .key-badge strong {
      font-weight: 700;
      color: #1d4ed8;
    }

    .count-badge {
      display: inline-flex;
      align-items: center;
      background: #f1f5f9;
      border: 1px solid #e2e8f0;
      padding: 6px 10px;
      border-radius: 8px;
      font-weight: 600;
      color: #475569;
    }

    /* Live Value Viewer */
    .readout {
      background: #eff6ff;
      border: 1px solid #bfdbfe;
      color: #1e40af;
      border-radius: 8px;
      padding: 8px 12px;
      font-size: 13px;
      font-weight: 600;
      text-align: center;
      min-height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
  </style>
</head>
<body>
  <div class="plot-card">
    <div class="title">Basketball Game Scores</div>

    <div class="plot-table">
      <div class="plot-header">
        <div>Stem</div>
        <div>Leaf</div>
      </div>

      
      <div class="plot-row" data-stem="1">
        <div class="stem-col">
          <div class="stem-badge">1</div>
        </div>
        <div class="leaf-col">
          <button class="leaf-btn" data-value="15">5</button>
          <button class="leaf-btn" data-value="15">5</button>
          <button class="leaf-btn" data-value="19">9</button>
        </div>
      </div>

      
      <div class="plot-row" data-stem="2">
        <div class="stem-col">
          <div class="stem-badge">2</div>
        </div>
        <div class="leaf-col">
          <button class="leaf-btn active" data-value="24">4</button>
          <button class="leaf-btn" data-value="24">4</button>
          <button class="leaf-btn" data-value="24">4</button>
          <button class="leaf-btn" data-value="27">7</button>
          <button class="leaf-btn" data-value="28">8</button>
        </div>
      </div>

      
      <div class="plot-row" data-stem="3">
        <div class="stem-col">
          <div class="stem-badge">3</div>
        </div>
        <div class="leaf-col">
          <button class="leaf-btn" data-value="31">1</button>
          <button class="leaf-btn" data-value="32">2</button>
          <button class="leaf-btn" data-value="35">5</button>
        </div>
      </div>

      
      <div class="plot-row" data-stem="4">
        <div class="stem-col">
          <div class="stem-badge">4</div>
        </div>
        <div class="leaf-col">
          <button class="leaf-btn" data-value="40">0</button>
        </div>
      </div>
    </div>

    
    <div class="readout" id="readout">
      Selected: Stem 2 + Leaf 4 = 24 points
    </div>

    <div class="footer-row">
      <div class="key-badge">
        Key: <strong>2 | 4</strong> = 24 points
      </div>
      <div class="count-badge">
        Total Leaves = 12 games
      </div>
    </div>
  </div>

  <script>
    const leafButtons = document.querySelectorAll('.leaf-btn');
    const readout = document.getElementById('readout');

    leafButtons.forEach(btn => {
      btn.addEventListener('click', () => {
        leafButtons.forEach(b => b.classList.remove('active'));
        btn.classList.add('active');

        const row = btn.closest('.plot-row');
        const stem = row.getAttribute('data-stem');
        const leaf = btn.textContent.trim();
        const score = btn.getAttribute('data-value');

        readout.textContent = `Selected: Stem ${stem} + Leaf ${leaf} = ${score} points`;
      });
    });
  </script>
</body>
</html>

Reading and Interpreting Stem-and-Leaf Plots with Whole Numbers

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Stem-and-Leaf Plot: Minimum and Maximum</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      width: 100%;
      min-height: 100vh;
      background: #ffffff;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px 8px;
      overflow-x: hidden;
    }

    .plot-container {
      position: relative;
      width: 100%;
      max-width: 420px;
      display: flex;
      flex-direction: column;
      align-items: center;
      margin: 0 auto;
    }

    /* Key Box */
    .key-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 6px;
      padding: 4px 10px;
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      margin-bottom: 24px;
      user-select: none;
    }

    .key-badge span {
      color: #1e2945;
      font-weight: 700;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    }

    /* Content Layout */
    .plot-layout {
      position: relative;
      width: 100%;
      display: flex;
      justify-content: flex-start;
      align-items: flex-start;
      min-height: 220px;
      padding-top: 10px;
    }

    /* Table Grid */
    .table-wrap {
      display: grid;
      grid-template-columns: 50px auto;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      font-size: 18px;
      line-height: 1.4;
      user-select: none;
      z-index: 2;
    }

    .col-header {
      font-family: system-ui, sans-serif;
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: #64748b;
      padding-bottom: 8px;
      border-bottom: 2px solid #cbd5e1;
    }

    .header-stem {
      text-align: right;
      padding-right: 12px;
      border-right: 2px solid #94a3b8;
    }

    .header-leaf {
      text-align: left;
      padding-left: 12px;
    }

    .stem-cell {
      text-align: right;
      padding: 6px 12px 6px 0;
      font-weight: 700;
      color: #334155;
      border-right: 2px solid #94a3b8;
      display: flex;
      align-items: center;
      justify-content: flex-end;
    }

    .leaf-cell {
      padding: 6px 0 6px 12px;
      font-weight: 600;
      color: #1e2945;
      display: flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
    }

    .leaf-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 22px;
      height: 24px;
    }

    /* Target Highlights */
    .target-leaf {
      width: 24px;
      height: 24px;
      border-radius: 5px;
      font-weight: 800;
      position: relative;
      z-index: 3;
    }

    .min-target {
      color: #9333ea;
      background: #f3e8ff;
      outline: 2px solid #9333ea;
    }

    .max-target {
      color: #ea580c;
      background: #ffedd5;
      outline: 2px solid #ea580c;
    }

    /* Callout Badges Container */
    .callouts-wrap {
      position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      width: 140px;
      pointer-events: auto;
      z-index: 10;
    }

    .callout {
      position: absolute;
      border-radius: 8px;
      padding: 6px 10px;
      display: flex;
      flex-direction: column;
      gap: 1px;
      box-shadow: 0 3px 10px rgba(0, 0, 0, 0.06);
      width: 138px;
      right: 0;
    }

    .callout-title {
      font-size: 13px;
      font-weight: 800;
      white-space: nowrap;
    }

    .callout-sub {
      font-size: 11px;
      font-weight: 500;
      opacity: 0.9;
      white-space: nowrap;
    }

    .callout-min {
      top: 2px;
      background: #faf5ff;
      border: 1.5px solid #c084fc;
      color: #7e22ce;
    }

    .callout-max {
      bottom: 4px;
      background: #fff7ed;
      border: 1.5px solid #fdba74;
      color: #c2410c;
    }

    /* SVG Connector Overlay */
    .connector-svg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 6;
      overflow: visible;
    }

    .arrow-path {
      fill: none;
      stroke-width: 2;
      stroke-dasharray: 4 4;
      animation: dash 1.2s linear infinite;
    }

    .path-min {
      stroke: #9333ea;
    }

    .path-max {
      stroke: #ea580c;
    }

    @keyframes dash {
      to {
        stroke-dashoffset: -8;
      }
    }

    /* Small Mobile Viewports */
    @media (max-width: 380px) {
      .plot-container {
        max-width: 100%;
      }

      .table-wrap {
        grid-template-columns: 42px auto;
        font-size: 16px;
      }

      .leaf-cell {
        gap: 4px;
        padding-left: 8px;
      }

      .header-stem, .stem-cell {
        padding-right: 8px;
      }

      .leaf-num, .target-leaf {
        width: 20px;
        height: 22px;
      }

      .callouts-wrap {
        width: 122px;
      }

      .callout {
        width: 120px;
        padding: 5px 8px;
      }

      .callout-title {
        font-size: 12px;
      }

      .callout-sub {
        font-size: 10px;
      }
    }
  </style>
</head>
<body>

  <div class="plot-container" id="plotWrap">
    
    <div class="key-badge">Key: <span>1 | 5 = 15</span></div>

    <div class="plot-layout" id="plotLayout">
      
      <div class="table-wrap">
        <div class="col-header header-stem">Stem</div>
        <div class="col-header header-leaf">Leaf</div>

        
        <div class="stem-cell">1</div>
        <div class="leaf-cell">
          <span class="leaf-num target-leaf min-target" id="minLeaf">5</span>
          <span class="leaf-num">5</span>
          <span class="leaf-num">9</span>
        </div>

        
        <div class="stem-cell">2</div>
        <div class="leaf-cell">
          <span class="leaf-num">4</span>
          <span class="leaf-num">4</span>
          <span class="leaf-num">4</span>
          <span class="leaf-num">7</span>
          <span class="leaf-num">8</span>
        </div>

        
        <div class="stem-cell">3</div>
        <div class="leaf-cell">
          <span class="leaf-num">1</span>
          <span class="leaf-num">2</span>
          <span class="leaf-num">5</span>
        </div>

        
        <div class="stem-cell">4</div>
        <div class="leaf-cell">
          <span class="leaf-num target-leaf max-target" id="maxLeaf">0</span>
        </div>
      </div>

      
      <div class="callouts-wrap">
        <div class="callout callout-min" id="minBox">
          <div class="callout-title">Minimum = 15</div>
          <div class="callout-sub">(lowest score)</div>
        </div>

        <div class="callout callout-max" id="maxBox">
          <div class="callout-title">Maximum = 40</div>
          <div class="callout-sub">(highest score)</div>
        </div>
      </div>

      
      <svg class="connector-svg" id="svgCanvas">
        <defs>
          <marker id="arrowMin" viewBox="0 0 8 8" refX="6" refY="4" markerWidth="6" markerHeight="6" orient="auto">
            <path d="M 1 1 L 7 4 L 1 7" fill="none" stroke="#9333ea" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" />
          </marker>
          <marker id="arrowMax" viewBox="0 0 8 8" refX="6" refY="4" markerWidth="6" markerHeight="6" orient="auto">
            <path d="M 1 1 L 7 4 L 1 7" fill="none" stroke="#ea580c" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" />
          </marker>
        </defs>
        <path id="pathMin" class="arrow-path path-min" marker-end="url(#arrowMin)" />
        <path id="pathMax" class="arrow-path path-max" marker-end="url(#arrowMax)" />
      </svg>
    </div>
  </div>

  <script>
    function updateConnectors() {
      const layout = document.getElementById('plotLayout').getBoundingClientRect();
      const minLeaf = document.getElementById('minLeaf').getBoundingClientRect();
      const maxLeaf = document.getElementById('maxLeaf').getBoundingClientRect();
      const minBox = document.getElementById('minBox').getBoundingClientRect();
      const maxBox = document.getElementById('maxBox').getBoundingClientRect();

      // Minimum arrow: arches cleanly from the top-left of the callout box into the top-center of leaf '5'
      // This prevents the line from crossing adjacent leaf digits (5, 9) in row 1.
      const minStartX = minBox.left - layout.left;
      const minStartY = minBox.top + minBox.height / 2 - layout.top;
      const minTargetX = minLeaf.left + minLeaf.width / 2 - layout.left;
      const minTargetY = minLeaf.top - layout.top - 2;

      // Arc smoothly up and land directly onto the top of minLeaf
      const cp1X = minStartX - (minStartX - minTargetX) * 0.4;
      const cp1Y = minTargetY - 14;
      const cp2X = minTargetX + (minStartX - minTargetX) * 0.2;
      const cp2Y = minTargetY - 16;

      document.getElementById('pathMin').setAttribute(
        'd',
        `M ${minStartX} ${minStartY} C ${cp1X} ${cp1Y}, ${cp2X} ${cp2Y}, ${minTargetX} ${minTargetY}`
      );

      // Maximum arrow: connects left side of Max callout to right side of leaf '0' on stem 4
      const maxStartX = maxBox.left - layout.left;
      const maxStartY = maxBox.top + maxBox.height / 2 - layout.top;
      const maxTargetX = maxLeaf.right - layout.left + 3;
      const maxTargetY = maxLeaf.top + maxLeaf.height / 2 - layout.top;

      const cpMaxX = (maxStartX + maxTargetX) / 2;
      document.getElementById('pathMax').setAttribute(
        'd',
        `M ${maxStartX} ${maxStartY} Q ${cpMaxX} ${maxStartY}, ${maxTargetX} ${maxTargetY}`
      );
    }

    window.addEventListener('resize', updateConnectors);
    window.addEventListener('load', updateConnectors);
    if (document.fonts && document.fonts.ready) {
      document.fonts.ready.then(updateConnectors);
    }
    setTimeout(updateConnectors, 60);
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Finding the Mode on a Stem-and-Leaf Plot</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      width: 100%;
      background: #ffffff;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding: 10px;
    }
    .main-wrap {
      width: 100%;
      max-width: 480px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .header-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
      font-weight: 700;
      color: #475569;
      padding: 0 4px;
    }
    .key-badge {
      background: #f1f5f9;
      color: #1e293b;
      padding: 3px 8px;
      border-radius: 6px;
      font-weight: 700;
      font-size: 12px;
      border: 1px solid #e2e8f0;
    }
    .plot-table {
      width: 100%;
      border-collapse: collapse;
      background: #ffffff;
    }
    .plot-row {
      border-bottom: 1px solid #f1f5f9;
      transition: background-color 0.15s ease;
    }
    .plot-row:last-child {
      border-bottom: none;
    }
    .plot-row:hover {
      background-color: #f8fafc;
    }
    .plot-row.active-mode {
      background-color: #f0fdf4;
    }
    .stem-cell {
      width: 42px;
      min-width: 42px;
      text-align: right;
      padding: 6px 12px 6px 0;
      font-size: 18px;
      font-weight: 800;
      color: #1e2945;
      border-right: 3px solid #cbd5e1;
    }
    .leaves-cell {
      padding: 6px 4px 6px 10px;
      display: flex;
      align-items: center;
      gap: 5px;
      flex-wrap: wrap;
    }
    .leaf {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 22px;
      height: 24px;
      font-size: 16px;
      font-weight: 700;
      color: #334155;
      border-radius: 4px;
    }
    /* Mode highlight group */
    .mode-group {
      display: inline-flex;
      align-items: center;
      gap: 2px;
      padding: 1px 5px;
      background: rgba(16, 185, 129, 0.16);
      border: 2px solid #10b981;
      border-radius: 999px;
      box-shadow: 0 0 8px rgba(16, 185, 129, 0.35);
    }
    .mode-group .leaf {
      color: #064e3b;
      font-weight: 900;
    }
    /* Repeat minor indicator */
    .minor-group {
      display: inline-flex;
      align-items: center;
      gap: 2px;
      padding: 1px 5px;
      background: #f1f5f9;
      border: 1.5px dashed #94a3b8;
      border-radius: 999px;
    }
    .minor-group .leaf {
      color: #334155;
    }
    .callout-tag {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 7px;
      border-radius: 6px;
      white-space: nowrap;
      margin-left: auto;
    }
    .callout-mode {
      background: #ecfdf5;
      color: #065f46;
      border: 1px solid #6ee7b7;
    }
    .callout-minor {
      background: #f8fafc;
      color: #475569;
      border: 1px solid #cbd5e1;
    }
    .bottom-card {
      background: #ecfdf5;
      border: 2px solid #10b981;
      border-radius: 8px;
      padding: 8px 12px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      margin-top: 2px;
    }
    .mode-title {
      font-size: 15px;
      font-weight: 900;
      color: #064e3b;
      line-height: 1.2;
    }
    .mode-sub {
      font-size: 12px;
      font-weight: 700;
      color: #047857;
      line-height: 1.2;
    }
    .pill {
      background: #065f46;
      color: #ffffff;
      font-size: 12px;
      font-weight: 800;
      padding: 4px 10px;
      border-radius: 999px;
      white-space: nowrap;
      letter-spacing: 0.2px;
    }
    @media (max-width: 375px) {
      .stem-cell {
        width: 36px;
        min-width: 36px;
        font-size: 16px;
        padding-right: 8px;
      }
      .leaves-cell {
        padding-left: 8px;
        gap: 3px;
      }
      .leaf {
        width: 18px;
        height: 22px;
        font-size: 14px;
      }
      .callout-tag {
        font-size: 10px;
        padding: 2px 5px;
      }
      .mode-title {
        font-size: 14px;
      }
      .mode-sub {
        font-size: 11px;
      }
      .pill {
        font-size: 11px;
        padding: 3px 8px;
      }
    }
  </style>
</head>
<body>
  <div class="main-wrap">
    <div class="header-row">
      <span>STEM | LEAVES</span>
      <span class="key-badge">Key: 2 | 4 = 24</span>
    </div>

    <table class="plot-table">
      
      <tr class="plot-row">
        <td class="stem-cell">1</td>
        <td class="leaves-cell">
          <div class="minor-group" title="15 appears 2 times">
            <span class="leaf">5</span>
            <span class="leaf">5</span>
          </div>
          <span class="leaf">9</span>
          <span class="callout-tag callout-minor">15 appears 2×</span>
        </td>
      </tr>

      
      <tr class="plot-row active-mode">
        <td class="stem-cell" style="color: #047857;">2</td>
        <td class="leaves-cell">
          <div class="mode-group" title="Leaf 4 appears 3 times on stem 2 → 24, 24, 24">
            <span class="leaf">4</span>
            <span class="leaf">4</span>
            <span class="leaf">4</span>
          </div>
          <span class="leaf">7</span>
          <span class="leaf">8</span>
          <span class="callout-tag callout-mode">24, 24, 24 (3×)</span>
        </td>
      </tr>

      
      <tr class="plot-row">
        <td class="stem-cell">3</td>
        <td class="leaves-cell">
          <span class="leaf">1</span>
          <span class="leaf">2</span>
          <span class="leaf">5</span>
        </td>
      </tr>

      
      <tr class="plot-row">
        <td class="stem-cell">4</td>
        <td class="leaves-cell">
          <span class="leaf">0</span>
        </td>
      </tr>
    </table>

    
    <div class="bottom-card">
      <div>
        <div class="mode-title">Mode = 24</div>
        <div class="mode-sub">Most frequent value</div>
      </div>
      <div class="pill">Appears 3 times</div>
    </div>
  </div>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="1:1">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      width: 100%;
      background: #ffffff;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 12px;
    }

    /* Plot Container */
    .plot-card {
      width: 100%;
      max-width: 420px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 14px 18px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .plot-table {
      display: grid;
      grid-template-columns: 60px 14px 1fr;
      align-items: center;
      row-gap: 8px;
      font-size: 18px;
      font-weight: 600;
    }

    .header-cell {
      font-size: 13px;
      font-weight: 700;
      color: #64748b;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      padding-bottom: 4px;
    }

    .stem-header { text-align: right; }
    .leaf-header { text-align: left; padding-left: 8px; }

    .stem {
      text-align: right;
      color: #334155;
      font-size: 19px;
      font-weight: 700;
      transition: color 0.25s ease;
    }

    .divider {
      width: 2px;
      height: 28px;
      background: #cbd5e1;
      margin: 0 auto;
      border-radius: 1px;
    }

    .leaves {
      display: flex;
      gap: 6px;
      align-items: center;
      padding-left: 8px;
      flex-wrap: wrap;
    }

    .leaf {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 28px;
      height: 28px;
      border-radius: 6px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      color: #1e2945;
      font-size: 16px;
      font-weight: 600;
      transition: all 0.25s ease;
      user-select: none;
    }

    /* Active Highlight States */
    .highlight-all .leaf {
      background: #e0f2fe;
      border-color: #38bdf8;
      color: #0369a1;
      font-weight: 700;
    }

    .highlight-min .stem-3,
    .highlight-min .leaf-32 {
      background: #dcfce7;
      border-color: #4ade80;
      color: #15803d;
      font-weight: 700;
    }
    .highlight-min .stem-3 { background: transparent; }

    .highlight-max .stem-5,
    .highlight-max .leaf-50 {
      background: #fef3c7;
      border-color: #facc15;
      color: #b45309;
      font-weight: 700;
    }
    .highlight-max .stem-5 { background: transparent; }

    .highlight-mode .stem-4,
    .highlight-mode .leaf-45 {
      background: #f3e8ff;
      border-color: #c084fc;
      color: #7e22ce;
      font-weight: 700;
    }
    .highlight-mode .stem-4 { background: transparent; }

    /* Key line */
    .key-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-top: 1px dashed #cbd5e1;
      padding-top: 8px;
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
    }

    .key-badge {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 3px 8px;
      border-radius: 6px;
      color: #1e2945;
    }

    /* Cards Grid */
    .cards-grid {
      width: 100%;
      max-width: 420px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
    }

    .stat-btn {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 10px;
      padding: 9px 10px;
      cursor: pointer;
      text-align: left;
      display: flex;
      flex-direction: column;
      gap: 3px;
      transition: all 0.2s ease;
      position: relative;
    }

    .stat-btn:active {
      transform: scale(0.98);
    }

    .stat-title {
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.4px;
      color: #64748b;
    }

    .stat-val-row {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
    }

    .stat-val {
      font-size: 20px;
      font-weight: 800;
      color: #0f172a;
    }

    .stat-sub {
      font-size: 11px;
      font-weight: 600;
      color: #94a3b8;
    }

    /* Card Themes & Active Highlights */
    .card-total.active {
      border-color: #0284c7;
      background: #f0f9ff;
      box-shadow: 0 2px 8px rgba(2, 132, 199, 0.15);
    }
    .card-total.active .stat-title { color: #0284c7; }
    .card-total.active .stat-val { color: #0369a1; }
    .card-total.active .stat-sub { color: #0284c7; }

    .card-min.active {
      border-color: #16a34a;
      background: #f0fdf4;
      box-shadow: 0 2px 8px rgba(22, 163, 74, 0.15);
    }
    .card-min.active .stat-title { color: #16a34a; }
    .card-min.active .stat-val { color: #15803d; }
    .card-min.active .stat-sub { color: #16a34a; }

    .card-max.active {
      border-color: #d97706;
      background: #fffbeb;
      box-shadow: 0 2px 8px rgba(217, 119, 6, 0.15);
    }
    .card-max.active .stat-title { color: #d97706; }
    .card-max.active .stat-val { color: #b45309; }
    .card-max.active .stat-sub { color: #d97706; }

    .card-mode.active {
      border-color: #9333ea;
      background: #faf5ff;
      box-shadow: 0 2px 8px rgba(147, 51, 234, 0.15);
    }
    .card-mode.active .stat-title { color: #9333ea; }
    .card-mode.active .stat-val { color: #7e22ce; }
    .card-mode.active .stat-sub { color: #9333ea; }
  </style>
</head>
<body>

  
  <div class="plot-card" id="plotContainer">
    <div class="plot-table">
      <div class="header-cell stem-header">Stem</div>
      <div></div>
      <div class="header-cell leaf-header">Leaf</div>

      
      <div class="stem stem-3">3</div>
      <div class="divider"></div>
      <div class="leaves">
        <span class="leaf leaf-32">2</span>
        <span class="leaf">8</span>
      </div>

      
      <div class="stem stem-4">4</div>
      <div class="divider"></div>
      <div class="leaves">
        <span class="leaf">1</span>
        <span class="leaf leaf-45">5</span>
        <span class="leaf leaf-45">5</span>
        <span class="leaf leaf-45">5</span>
        <span class="leaf">9</span>
      </div>

      
      <div class="stem stem-5">5</div>
      <div class="divider"></div>
      <div class="leaves">
        <span class="leaf leaf-50">0</span>
      </div>
    </div>

    
    <div class="key-bar">
      <span>Key</span>
      <span class="key-badge">4 | 1 = 41 pts</span>
    </div>
  </div>

  
  <div class="cards-grid">
    
    <button class="stat-btn card-total active" onclick="selectCard('total', this)">
      <span class="stat-title">Total</span>
      <div class="stat-val-row">
        <span class="stat-val">8</span>
        <span class="stat-sub">8 leaves</span>
      </div>
    </button>

    
    <button class="stat-btn card-min" onclick="selectCard('min', this)">
      <span class="stat-title">Minimum</span>
      <div class="stat-val-row">
        <span class="stat-val">32</span>
        <span class="stat-sub">3 | 2</span>
      </div>
    </button>

    
    <button class="stat-btn card-max" onclick="selectCard('max', this)">
      <span class="stat-title">Maximum</span>
      <div class="stat-val-row">
        <span class="stat-val">50</span>
        <span class="stat-sub">5 | 0</span>
      </div>
    </button>

    
    <button class="stat-btn card-mode" onclick="selectCard('mode', this)">
      <span class="stat-title">Mode</span>
      <div class="stat-val-row">
        <span class="stat-val">45</span>
        <span class="stat-sub">Three 5s</span>
      </div>
    </button>
  </div>

  <script>
    const plot = document.getElementById('plotContainer');
    const buttons = document.querySelectorAll('.stat-btn');

    function selectCard(mode, btn) {
      // Clear plot highlights
      plot.classList.remove('highlight-all', 'highlight-min', 'highlight-max', 'highlight-mode');
      
      // Clear active buttons
      buttons.forEach(b => b.classList.remove('active'));
      btn.classList.add('active');

      // Apply mode class to plot
      if (mode === 'total') {
        plot.classList.add('highlight-all');
      } else if (mode === 'min') {
        plot.classList.add('highlight-min');
      } else if (mode === 'max') {
        plot.classList.add('highlight-max');
      } else if (mode === 'mode') {
        plot.classList.add('highlight-mode');
      }
    }

    // Set initial state
    plot.classList.add('highlight-all');
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    body {
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px;
      min-height: 100%;
    }

    .diagram {
      width: 100%;
      max-width: 440px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
    }

    /* Top Selector */
    .controls {
      display: flex;
      gap: 8px;
      justify-content: center;
      width: 100%;
    }

    .btn-num {
      padding: 5px 12px;
      font-size: 14px;
      font-weight: 700;
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 8px;
      color: #64748b;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .btn-num.active {
      border-color: #2563eb;
      color: #1e2945;
      background: #eff6ff;
    }

    /* Number Split Display */
    .split-card {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      width: 100%;
    }

    .digit-group {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
    }

    .digit-box {
      width: 44px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      font-weight: 800;
      border-radius: 8px;
      transition: transform 0.25s ease, background-color 0.25s ease;
    }

    .stem-box {
      background: #dbeafe;
      color: #2563eb;
      border: 2px solid #2563eb;
    }

    .leaf-box {
      background: #dcfce7;
      color: #16a34a;
      border: 2px solid #16a34a;
    }

    .digit-label {
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .stem-label { color: #2563eb; }
    .leaf-label { color: #16a34a; }

    .split-arrow {
      font-size: 20px;
      color: #94a3b8;
      font-weight: 700;
    }

    /* Table Display */
    .table-container {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 20px;
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .table-header {
      display: grid;
      grid-template-columns: 80px 20px 1fr;
      align-items: center;
      font-size: 14px;
      font-weight: 800;
      padding-bottom: 6px;
      border-bottom: 2px solid #e2e8f0;
      width: 100%;
      text-align: center;
    }

    .table-header .th-stem { color: #2563eb; text-align: right; padding-right: 12px; }
    .table-header .th-leaf { color: #16a34a; text-align: left; padding-left: 12px; }

    .table-body {
      display: flex;
      flex-direction: column;
      width: 100%;
      margin-top: 4px;
    }

    .t-row {
      display: grid;
      grid-template-columns: 80px 20px 1fr;
      align-items: center;
      padding: 4px 0;
      font-size: 18px;
      font-weight: 700;
    }

    .t-stem {
      text-align: right;
      padding-right: 12px;
      color: #64748b;
      transition: color 0.2s ease, font-weight 0.2s ease;
    }

    .t-bar {
      width: 2px;
      height: 100%;
      min-height: 24px;
      background: #cbd5e1;
      margin: 0 auto;
    }

    .t-leaves {
      display: flex;
      gap: 10px;
      text-align: left;
      padding-left: 12px;
      color: #64748b;
    }

    .leaf-val {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 24px;
      height: 24px;
      border-radius: 6px;
      transition: all 0.2s ease;
    }

    /* Active Highlight States */
    .t-row.active .t-stem {
      color: #2563eb;
      font-size: 20px;
      font-weight: 800;
    }

    .leaf-val.active {
      background: #dcfce7;
      color: #16a34a;
      font-weight: 800;
      box-shadow: 0 0 0 2px #16a34a;
    }

    /* Key Box */
    .key-box {
      width: 100%;
      background: #ffffff;
      border: 2px dashed #93c5fd;
      border-radius: 10px;
      padding: 8px 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 15px;
      font-weight: 700;
    }

    .key-tag {
      background: #eff6ff;
      color: #2563eb;
      font-size: 11px;
      padding: 2px 6px;
      border-radius: 4px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .key-eq {
      color: #1e2945;
    }
  </style>
</head>
<body>
  <div class="diagram">
    <div class="controls">
      <button class="btn-num" onclick="selectScore(15)">15</button>
      <button class="btn-num" onclick="selectScore(24)">24</button>
      <button class="btn-num active" onclick="selectScore(35)">35</button>
      <button class="btn-num" onclick="selectScore(40)">40</button>
    </div>

    
    <div class="split-card">
      <div class="digit-group">
        <div id="stemBox" class="digit-box stem-box">3</div>
        <div class="digit-label stem-label">Stem (Tens)</div>
      </div>
      <div class="split-arrow">+</div>
      <div class="digit-group">
        <div id="leafBox" class="digit-box leaf-box">5</div>
        <div class="digit-label leaf-label">Leaf (Ones)</div>
      </div>
    </div>

    
    <div class="table-container">
      <div class="table-header">
        <div class="th-stem">Stem</div>
        <div></div>
        <div class="th-leaf">Leaf</div>
      </div>
      <div class="table-body">
        <div class="t-row" id="row-1">
          <div class="t-stem">1</div>
          <div class="t-bar"></div>
          <div class="t-leaves">
            <span class="leaf-val" data-score="15">5</span>
            <span class="leaf-val" data-score="19">9</span>
          </div>
        </div>
        <div class="t-row" id="row-2">
          <div class="t-stem">2</div>
          <div class="t-bar"></div>
          <div class="t-leaves">
            <span class="leaf-val" data-score="24">4</span>
            <span class="leaf-val">4</span>
            <span class="leaf-val">7</span>
            <span class="leaf-val">8</span>
          </div>
        </div>
        <div class="t-row active" id="row-3">
          <div class="t-stem">3</div>
          <div class="t-bar"></div>
          <div class="t-leaves">
            <span class="leaf-val">1</span>
            <span class="leaf-val">2</span>
            <span class="leaf-val active" data-score="35">5</span>
          </div>
        </div>
        <div class="t-row" id="row-4">
          <div class="t-stem">4</div>
          <div class="t-bar"></div>
          <div class="t-leaves">
            <span class="leaf-val" data-score="40">0</span>
          </div>
        </div>
      </div>
    </div>

    
    <div class="key-box">
      <span class="key-tag">Key</span>
      <span class="key-eq"><span style="color:#2563eb" id="keyStem">3</span> | <span style="color:#16a34a" id="keyLeaf">5</span> = <span id="keyValue">35</span> points</span>
    </div>
  </div>

  <script>
    function selectScore(val) {
      const s = String(val);
      const tens = s[0];
      const ones = s[1];

      // Update Split Digits
      document.getElementById('stemBox').textContent = tens;
      document.getElementById('leafBox').textContent = ones;

      // Update Key
      document.getElementById('keyStem').textContent = tens;
      document.getElementById('keyLeaf').textContent = ones;
      document.getElementById('keyValue').textContent = val;

      // Update Buttons
      document.querySelectorAll('.btn-num').forEach(btn => {
        btn.classList.toggle('active', btn.textContent.trim() === s);
      });

      // Update Table Highlight
      document.querySelectorAll('.t-row').forEach(row => {
        row.classList.remove('active');
      });
      document.querySelectorAll('.leaf-val').forEach(el => {
        el.classList.remove('active');
      });

      const activeRow = document.getElementById('row-' + tens);
      if (activeRow) {
        activeRow.classList.add('active');
        const targetLeaf = activeRow.querySelector(`[data-score="${val}"]`);
        if (targetLeaf) {
          targetLeaf.classList.add('active');
        }
      }
    }
  </script>
</body>
</html>

Formulating Statistical Questions and Collecting Data

Recording Data Using Tally Charts and Tables

Creating and Interpreting Frequency Tables

Reading and Interpreting Two-Way Frequency Tables

Constructing Two-Way Tables from Word Problems

Solving Multi-Step Problems Using Two-Way Tables

math

Data Collection, Tables, and Frequency Displays

Découvrir le tableau à double entrée : lignes et colonnes

Lire et prélever des données dans un tableau à double entrée

Compléter les cases manquantes d'un tableau à double entrée

Calculer les totaux par ligne et par colonne dans un tableau

Retrouver une valeur manquante à partir du total

Construire un tableau à double entrée à partir d'un texte documentaire

Lire un tableau de tarifs et de prix combinés

Résoudre un problème à étapes avec un tableau à double entrée

Comparer deux tableaux de répartition

Détecter et corriger une incohérence dans un tableau

Tableaux de données : lecture, construction et calculs

Identifier les composantes d'un diagramme en barres : titre, axes et légendes

Lire un diagramme en barres avec une graduation de 5 en 5 ou de 10 en 10

Estimer une valeur située entre deux graduations sur un diagramme

Lire et interpréter un diagramme à barres horizontales

Comparer des quantités sur un diagramme en barres

Transposer un tableau de données en diagramme en barres

Choisir une graduation adaptée pour construire son graphique

Lire un diagramme en barres groupées (comparer deux séries)

Résoudre des problèmes à plusieurs étapes avec un diagramme en barres

Diagrammes en barres : lecture, graduation et construction

Finding Mode, Median, and Range From Data Displays

One-Step Problems With Frequency Tables

Two-Step Problems With Dot Plots and Fractions

Solving Problems With Stem-and-Leaf Plots

Choosing the Best Graph Type for Your Data

Interpreting and Solving Problems With Data

Drawing Scaled Pictographs from Frequency Data

Constructing Single Bar Charts with Scaled Axes

Interpreting Double Bar Charts for Comparison

Constructing Double Bar Charts with Keys

Solving Multi-Step Problems Using Bar Graphs

Scaled Graphs and Comparative Data Displays

Comprendre les deux axes d'un repère : abscisse et ordonnée

Placer et lire un ensemble de points dans un repère

Lire et suivre une courbe d'évolution dans le temps

Décrire les variations d'une courbe : hausse, baisse et stabilité

Identifier les valeurs remarquables d'un graphique : maximum, minimum et point d'inflexion

Construire une courbe d'évolution en reliant des points consécutifs

Comparer deux courbes d'évolution sur un même graphique

Résoudre des problèmes de distance et de durée avec un graphique cartésien

Courbes d'évolution et nuages de points dans un repère

Introduction to Line Plots With Fractional Measurements

Making Line Plots With Fractional Measurements

Interpreting Line Plots With Fractions

Adding and Subtracting Fractions Using Line Plot Data

Redistributing Quantities Equally from Line Plots

Solving Multi-Step Fraction Word Problems with Line Plots

Line Plots and Fractional Data

Découvrir le diagramme circulaire : la totalité et les parts

Associer des angles de secteurs à des fractions simples : demi, quart et trois quarts

Lire des pourcentages sur un diagramme circulaire avec légende

Calculer un effectif à partir d'un secteur simple (moitié, quart)

Lire et interpréter un diagramme semi-circulaire

Associer un tableau de données au diagramme circulaire correspondant

Résoudre des problèmes à étapes avec un diagramme circulaire

Diagrammes circulaires : lecture de secteurs et proportions

Creating Stem-and-Leaf Plots from Data Sets

Creating Stem-and-Leaf Plots With Fractions and Decimals

Interpreting and Drawing Time Graphs for Continuous Data

Drawing Continuous Time-Series Line Graphs

Solving Multi-Step Problems Using Pie Charts and Line Graphs

Stem-and-Leaf Plots and Time Graphs

Calculating the Mean of a Data Set

Finding the Median of Ordered Data Sets

Determining Mode and Range to Describe Variability

Describing Data Distribution Shapes: Symmetry and Skew

Comparing Mean, Median, and Mode

Choosing Between Mean, Median, and Mode for Skewed Data

Solving Real-World Problems with Measures of Center

Measures of Center and Data Distributions

Croiser les données d'un tableau et d'un diagramme pour résoudre des énigmes

Résoudre un problème de budget avec tableau de recettes et graphique d'évolution

Interpréter des données météorologiques croisées (températures et précipitations)

OGM.5.ST.2

Aligned learning resources

Related diagrams