<!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: transparent;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 10px 8px;
      user-select: none;
    }

    .main-svg {
      width: 100%;
      max-width: 580px;
      height: auto;
      display: block;
      overflow: visible;
    }

    /* Interactive Stepper Bar */
    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin-top: 4px;
      flex-wrap: wrap;
    }

    .btn-step {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      color: #475569;
      font-size: 14px;
      font-weight: 700;
      padding: 6px 14px;
      border-radius: 20px;
      cursor: pointer;
      transition: background 0.2s, color 0.2s, box-shadow 0.2s;
    }

    .btn-step.active {
      background: #0284c7;
      color: #ffffff;
      border-color: #0284c7;
      box-shadow: 0 2px 6px rgba(2, 132, 199, 0.35);
    }

    .btn-play {
      background: #e0f2fe;
      border: 1px solid #7dd3fc;
      color: #0369a1;
      font-size: 14px;
      font-weight: 700;
      padding: 6px 14px;
      border-radius: 20px;
      cursor: pointer;
      transition: background 0.2s, color 0.2s;
    }

    /* SVG styling */
    .hop-path {
      fill: none;
      stroke: #0284c7;
      stroke-width: 3.5;
      stroke-linecap: round;
      stroke-linejoin: round;
      transition: opacity 0.3s ease, stroke-dashoffset 0.4s ease;
    }

    .hop-label {
      font-size: 13px;
      font-weight: 800;
      fill: #0284c7;
      text-anchor: middle;
      transition: opacity 0.3s ease;
    }

    .slice {
      transition: fill 0.3s ease;
      stroke: #ffffff;
      stroke-width: 2.5;
      cursor: pointer;
    }

    .tick-label {
      font-size: 14px;
      font-weight: 700;
      fill: #475569;
      text-anchor: middle;
    }

    .tick-sub {
      font-size: 12px;
      font-weight: 600;
      fill: #94a3b8;
      text-anchor: middle;
    }

    .target-highlight {
      font-weight: 800;
      fill: #0284c7;
    }

    .slice-num {
      font-size: 13px;
      font-weight: 800;
      text-anchor: middle;
      dominant-baseline: central;
      pointer-events: none;
      transition: fill 0.3s ease;
    }
  </style>
</head>
<body>

  <svg class="main-svg" viewBox="0 0 580 340" aria-label="5 hops of 1/3 on a number line and circle models">
    
    
    
    <line x1="30" y1="90" x2="550" y2="90" stroke="#cbd5e1" stroke-width="4" stroke-linecap="round" />

    
    
    <line x1="50" y1="80" x2="50" y2="100" stroke="#64748b" stroke-width="3" stroke-linecap="round" />
    <text x="50" y="120" class="tick-label">0</text>

    
    <line x1="130" y1="82" x2="130" y2="98" stroke="#94a3b8" stroke-width="2.5" stroke-linecap="round" />
    <text x="130" y="120" class="tick-label">¹/₃</text>

    
    <line x1="210" y1="82" x2="210" y2="98" stroke="#94a3b8" stroke-width="2.5" stroke-linecap="round" />
    <text x="210" y="120" class="tick-label">²/₃</text>

    
    <line x1="290" y1="78" x2="290" y2="102" stroke="#64748b" stroke-width="3" stroke-linecap="round" />
    <text x="290" y="120" class="tick-label">³/₃</text>
    <text x="290" y="136" class="tick-sub">(1)</text>

    
    <line x1="370" y1="82" x2="370" y2="98" stroke="#94a3b8" stroke-width="2.5" stroke-linecap="round" />
    <text x="370" y="120" class="tick-label">⁴/₃</text>

    
    <line x1="450" y1="78" x2="450" y2="102" stroke="#0284c7" stroke-width="3.5" stroke-linecap="round" />
    <text x="450" y="120" class="tick-label target-highlight">⁵/₃</text>

    
    <line x1="530" y1="80" x2="530" y2="100" stroke="#64748b" stroke-width="3" stroke-linecap="round" />
    <text x="530" y="120" class="tick-label">⁶/₃</text>
    <text x="530" y="136" class="tick-sub">(2)</text>

    
    
    <g id="hop-1" opacity="1">
      <path d="M 50 85 Q 90 35 130 85" class="hop-path" />
      <polygon points="127,78 132,87 122,87" fill="#0284c7" />
      <text x="90" y="44" class="hop-label">+¹/₃</text>
    </g>

    
    <g id="hop-2" opacity="1">
      <path d="M 130 85 Q 170 35 210 85" class="hop-path" />
      <polygon points="207,78 212,87 202,87" fill="#0284c7" />
      <text x="170" y="44" class="hop-label">+¹/₃</text>
    </g>

    
    <g id="hop-3" opacity="1">
      <path d="M 210 85 Q 250 35 290 85" class="hop-path" />
      <polygon points="287,78 292,87 282,87" fill="#0284c7" />
      <text x="250" y="44" class="hop-label">+¹/₃</text>
    </g>

    
    <g id="hop-4" opacity="1">
      <path d="M 290 85 Q 330 35 370 85" class="hop-path" />
      <polygon points="367,78 372,87 362,87" fill="#0284c7" />
      <text x="330" y="44" class="hop-label">+¹/₃</text>
    </g>

    
    <g id="hop-5" opacity="1">
      <path d="M 370 85 Q 410 35 450 85" class="hop-path" />
      <polygon points="447,78 452,87 442,87" fill="#0284c7" />
      <text x="410" y="44" class="hop-label">+¹/₃</text>
    </g>

    
    <circle id="marker-dot" cx="450" cy="90" r="6.5" fill="#0284c7" stroke="#ffffff" stroke-width="2.5" />

    

    
    <g transform="translate(170, 240)">
      
      <circle cx="0" cy="0" r="54" fill="none" stroke="#e2e8f0" stroke-width="3" />
      
      
      
      <path id="slice-1" class="slice" d="M 0 0 L 0 -52 A 52 52 0 0 1 45.03 26 Z" fill="#38bdf8" />
      <text x="17" y="-12" id="snum-1" class="slice-num" fill="#ffffff">¹/₃</text>

      
      
      <path id="slice-2" class="slice" d="M 0 0 L 45.03 26 A 52 52 0 0 1 -45.03 26 Z" fill="#38bdf8" />
      <text x="0" y="24" id="snum-2" class="slice-num" fill="#ffffff">¹/₃</text>

      
      
      <path id="slice-3" class="slice" d="M 0 0 L -45.03 26 A 52 52 0 0 1 0 -52 Z" fill="#38bdf8" />
      <text x="-17" y="-12" id="snum-3" class="slice-num" fill="#ffffff">¹/₃</text>

      <text x="0" y="74" class="tick-label">³/₃ = 1</text>
    </g>

    
    <g transform="translate(410, 240)">
      
      <circle cx="0" cy="0" r="54" fill="none" stroke="#e2e8f0" stroke-width="3" />
      
      
      <path id="slice-4" class="slice" d="M 0 0 L 0 -52 A 52 52 0 0 1 45.03 26 Z" fill="#38bdf8" />
      <text x="17" y="-12" id="snum-4" class="slice-num" fill="#ffffff">¹/₃</text>

      
      <path id="slice-5" class="slice" d="M 0 0 L 45.03 26 A 52 52 0 0 1 -45.03 26 Z" fill="#38bdf8" />
      <text x="0" y="24" id="snum-5" class="slice-num" fill="#ffffff">¹/₃</text>

      
      <path id="slice-6" class="slice" d="M 0 0 L -45.03 26 A 52 52 0 0 1 0 -52 Z" fill="#f1f5f9" />
      <text x="-17" y="-12" id="snum-6" class="slice-num" fill="#cbd5e1">¹/₃</text>

      <text x="0" y="74" class="tick-label">²/₃</text>
    </g>

    
    <text x="290" y="245" font-size="24" font-weight="800" fill="#94a3b8" text-anchor="middle">+</text>
  </svg>

  
  <div class="controls">
    <button class="btn-play" id="btn-play" aria-label="Toggle auto-play">⏸ Pause</button>
    <button class="btn-step" data-step="1">1</button>
    <button class="btn-step" data-step="2">2</button>
    <button class="btn-step" data-step="3">3</button>
    <button class="btn-step" data-step="4">4</button>
    <button class="btn-step active" data-step="5">5</button>
  </div>

  <script>
    let currentStep = 5;
    let isPlaying = true;
    let timer = null;

    const hopCoords = [50, 130, 210, 290, 370, 450];
    const buttons = document.querySelectorAll('.btn-step');
    const playBtn = document.getElementById('btn-play');
    const marker = document.getElementById('marker-dot');

    function updateState(step) {
      currentStep = step;

      // Update buttons
      buttons.forEach(btn => {
        const s = parseInt(btn.getAttribute('data-step'), 10);
        btn.classList.toggle('active', s === step);
      });

      // Update hops and dot
      marker.setAttribute('cx', hopCoords[step]);

      for (let i = 1; i <= 5; i++) {
        const hop = document.getElementById('hop-' + i);
        const slice = document.getElementById('slice-' + i);
        const snum = document.getElementById('snum-' + i);

        if (i <= step) {
          hop.style.opacity = '1';
          slice.setAttribute('fill', '#0284c7');
          snum.setAttribute('fill', '#ffffff');
        } else {
          hop.style.opacity = '0.15';
          slice.setAttribute('fill', '#f1f5f9');
          snum.setAttribute('fill', '#cbd5e1');
        }
      }
    }

    function nextStep() {
      let next = currentStep + 1;
      if (next > 5) next = 1;
      updateState(next);
    }

    function startAutoPlay() {
      if (timer) clearInterval(timer);
      timer = setInterval(nextStep, 2600);
      isPlaying = true;
      playBtn.textContent = '⏸ Pause';
    }

    function stopAutoPlay() {
      if (timer) clearInterval(timer);
      isPlaying = false;
      playBtn.textContent = '▶ Play';
    }

    playBtn.addEventListener('click', () => {
      if (isPlaying) {
        stopAutoPlay();
      } else {
        nextStep();
        startAutoPlay();
      }
    });

    buttons.forEach(btn => {
      btn.addEventListener('click', () => {
        stopAutoPlay();
        const s = parseInt(btn.getAttribute('data-step'), 10);
        updateState(s);
      });
    });

    // Initialize to full 5 thirds
    updateState(5);
    startAutoPlay();
  </script>
</body>
</html>

Numerator as Repeated Addition of a Unit Fraction

<!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: transparent;
      color: #1e293b;
      padding: 12px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      width: 100%;
      max-width: 640px;
    }

    @media (max-width: 520px) {
      .comparison-grid {
        grid-template-columns: 1fr;
        gap: 12px;
      }
    }

    .col-box {
      background: #ffffff;
      border-radius: 12px;
      padding: 14px 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
    }

    .correct-box {
      border: 2px solid #10b981;
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.08);
    }

    .error-box {
      border: 2px solid #f87171;
      box-shadow: 0 4px 12px rgba(239, 68, 68, 0.08);
    }

    .badge {
      font-size: 13px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .badge-correct {
      background: #ecfdf5;
      color: #059669;
    }

    .badge-error {
      background: #fef2f2;
      color: #dc2626;
    }

    /* Fraction Formatting */
    .frac-row {
      display: flex;
      align-items: center;
      gap: 6px;
      font-weight: 700;
      font-size: 17px;
      color: #334155;
    }

    .frac {
      display: inline-flex;
      flex-direction: column;
      vertical-align: middle;
      text-align: center;
      font-size: 15px;
      line-height: 1;
    }

    .frac .top {
      padding: 0 3px 2px;
      border-bottom: 1.5px solid currentColor;
    }

    .frac .bottom {
      padding: 2px 3px 0;
    }

    .correct-text { color: #059669; }
    .error-text { color: #dc2626; }

    /* Visual Bars */
    .bar-wrap {
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
    }

    .bar {
      width: 100%;
      height: 38px;
      display: flex;
      border-radius: 8px;
      overflow: hidden;
      border: 2px solid #cbd5e1;
      background: #f1f5f9;
    }

    /* 4 Segments */
    .seg-4 {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      font-weight: 700;
      border-right: 1.5px solid #fff;
    }
    .seg-4:last-child { border-right: none; }
    .seg-4.filled {
      background: #10b981;
      color: #ffffff;
    }
    .seg-4.empty {
      background: #f8fafc;
      color: #94a3b8;
    }

    /* 12 Segments */
    .seg-12 {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      border-right: 1px solid rgba(255,255,255,0.7);
    }
    .seg-12:last-child { border-right: none; }
    .seg-12.filled {
      background: #ef4444;
    }
    .seg-12.empty {
      background: #f8fafc;
    }

    /* Bracket & Annotation */
    .annotation {
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 100%;
      font-size: 13px;
      font-weight: 600;
    }

    .bracket-svg {
      width: 100%;
      height: 12px;
      overflow: visible;
    }

    .note-correct {
      color: #047857;
      margin-top: 2px;
    }

    .note-error {
      color: #b91c1c;
      margin-top: 2px;
    }

    .toggle-btn {
      margin-top: 14px;
      background: #0ea5e9;
      color: #fff;
      border: none;
      padding: 8px 16px;
      font-size: 13px;
      font-weight: 700;
      border-radius: 20px;
      cursor: pointer;
      box-shadow: 0 2px 6px rgba(14, 165, 233, 0.25);
      transition: background 0.2s, transform 0.1s;
    }
    .toggle-btn:active {
      transform: scale(0.98);
      background: #0284c7;
    }
  </style>
</head>
<body>

  <div class="comparison-grid">
    
    <div class="col-box correct-box">
      <div class="badge badge-correct">✓ Keep Piece Size</div>
      
      <div class="frac-row">
        <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
        +
        <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
        +
        <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
        =
        <span class="frac correct-text"><span class="top">3</span><span class="bottom">4</span></span>
      </div>

      <div class="bar-wrap">
        <div class="bar" id="bar4">
          <div class="seg-4 filled">¼</div>
          <div class="seg-4 filled">¼</div>
          <div class="seg-4 filled">¼</div>
          <div class="seg-4 empty"></div>
        </div>
        <div class="annotation">
          <svg class="bracket-svg" viewBox="0 0 100 12" preserveAspectRatio="none">
            <path d="M 0,2 L 0,8 Q 0,10 5,10 L 32.5,10 Q 37.5,10 37.5,12 Q 37.5,10 42.5,10 L 70,10 Q 75,10 75,8 L 75,2" fill="none" stroke="#059669" stroke-width="2" />
          </svg>
          <span class="note-correct">3 fourth-sized pieces</span>
        </div>
      </div>
    </div>

    
    <div class="col-box error-box">
      <div class="badge badge-error">✗ Adding Denominators</div>
      
      <div class="frac-row">
        <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
        +
        <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
        +
        <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
        ≠
        <span class="frac error-text"><span class="top">3</span><span class="bottom">12</span></span>
      </div>

      <div class="bar-wrap">
        <div class="bar" id="bar12">
          <div class="seg-12 filled"></div>
          <div class="seg-12 filled"></div>
          <div class="seg-12 filled"></div>
          <div class="seg-12 empty"></div>
          <div class="seg-12 empty"></div>
          <div class="seg-12 empty"></div>
          <div class="seg-12 empty"></div>
          <div class="seg-12 empty"></div>
          <div class="seg-12 empty"></div>
          <div class="seg-12 empty"></div>
          <div class="seg-12 empty"></div>
          <div class="seg-12 empty"></div>
        </div>
        <div class="annotation">
          <svg class="bracket-svg" viewBox="0 0 100 12" preserveAspectRatio="none">
            <path d="M 0,2 L 0,8 Q 0,10 3,10 L 9.5,10 Q 12.5,10 12.5,12 Q 12.5,10 15.5,10 L 22,10 Q 25,10 25,8 L 25,2" fill="none" stroke="#dc2626" stroke-width="2" />
          </svg>
          <span class="note-error">Pieces shrink to twelfths!</span>
        </div>
      </div>
    </div>
  </div>

  <button class="toggle-btn" id="compareBtn">⚡ Highlight Difference</button>

  <script>
    const btn = document.getElementById('compareBtn');
    let highlighted = false;

    btn.addEventListener('click', () => {
      highlighted = !highlighted;
      const bar4 = document.getElementById('bar4');
      const bar12 = document.getElementById('bar12');

      if (highlighted) {
        bar4.style.boxShadow = '0 0 0 3px #10b981';
        bar12.style.boxShadow = '0 0 0 3px #ef4444';
        bar4.style.transition = 'box-shadow 0.3s ease';
        bar12.style.transition = 'box-shadow 0.3s ease';
        btn.textContent = '✓ Reset View';
      } else {
        bar4.style.boxShadow = 'none';
        bar12.style.boxShadow = 'none';
        btn.textContent = '⚡ Highlight Difference';
      }
    });
  </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 {
      background: #f8f9fa;
      color: #1e2945;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      padding: 16px;
      user-select: none;
    }

    .diagram {
      width: 100%;
      max-width: 520px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 24px;
    }

    /* Fraction Strip */
    .strip-container {
      width: 100%;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      width: 100%;
      height: 72px;
      background: #ffffff;
      border: 2px solid #cbd5e1;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
    }

    .segment {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      border-right: 2px solid #cbd5e1;
      background: #ffffff;
      color: #64748b;
      font-weight: 700;
      transition: background-color 0.35s ease, color 0.35s ease;
      cursor: pointer;
    }

    .segment:last-child {
      border-right: none;
    }

    .segment.active {
      background: #2563eb;
      color: #ffffff;
    }

    .frac {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      vertical-align: middle;
      font-size: 16px;
      line-height: 1.1;
    }

    .frac .top {
      border-bottom: 1.5px solid currentColor;
      padding: 0 3px;
      display: block;
    }

    .frac .bottom {
      padding: 0 3px;
      display: block;
    }

    /* Equation Display */
    .equation-box {
      width: 100%;
      min-height: 64px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: #1e2945;
      padding: 10px 16px;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
    }

    .eq-term {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      opacity: 0.2;
      transition: opacity 0.3s ease;
    }

    .eq-term.active {
      opacity: 1;
      color: #2563eb;
    }

    .eq-result {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      opacity: 0.2;
      transition: opacity 0.3s ease;
    }

    .eq-result.active {
      opacity: 1;
      color: #1e2945;
    }

    .symbol {
      color: #94a3b8;
      font-size: 18px;
    }

    .eq-result .symbol {
      color: #64748b;
    }

    /* Controls */
    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      width: 100%;
      flex-wrap: wrap;
    }

    .btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #1e2945;
      border-radius: 8px;
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: background-color 0.2s ease, border-color 0.2s ease;
    }

    .btn:active {
      background: #f1f5f9;
    }

    .step-btn {
      min-width: 40px;
      justify-content: center;
    }

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

  <div class="diagram">
    
    <div class="strip-container">
      <div class="strip">
        <div class="segment" id="seg-0" onclick="setStep(1)">
          <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
        </div>
        <div class="segment" id="seg-1" onclick="setStep(2)">
          <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
        </div>
        <div class="segment" id="seg-2" onclick="setStep(3)">
          <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
        </div>
        <div class="segment" id="seg-3" onclick="setStep(3)">
          <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
        </div>
      </div>
    </div>

    
    <div class="equation-box">
      <span class="eq-term" id="term-0">
        <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
      </span>

      <span class="eq-term" id="term-1">
        <span class="symbol">+</span>
        <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
      </span>

      <span class="eq-term" id="term-2">
        <span class="symbol">+</span>
        <span class="frac"><span class="top">1</span><span class="bottom">4</span></span>
      </span>

      <span class="eq-result" id="eq-res">
        <span class="symbol">=</span>
        <span class="frac" id="result-frac"><span class="top" id="res-num">3</span><span class="bottom">4</span></span>
      </span>
    </div>

    
    <div class="controls">
      <button class="btn" id="playBtn" onclick="togglePlay()">⏸ Pause</button>
      <button class="btn step-btn" id="btn-1" onclick="setStep(1)">1</button>
      <button class="btn step-btn" id="btn-2" onclick="setStep(2)">2</button>
      <button class="btn step-btn" id="btn-3" onclick="setStep(3)">3</button>
    </div>
  </div>

  <script>
    let currentStep = 1;
    let isPlaying = true;
    let timer = null;

    const segs = [
      document.getElementById('seg-0'),
      document.getElementById('seg-1'),
      document.getElementById('seg-2'),
      document.getElementById('seg-3')
    ];

    const terms = [
      document.getElementById('term-0'),
      document.getElementById('term-1'),
      document.getElementById('term-2')
    ];

    const stepBtns = [
      document.getElementById('btn-1'),
      document.getElementById('btn-2'),
      document.getElementById('btn-3')
    ];

    const eqRes = document.getElementById('eq-res');
    const resNum = document.getElementById('res-num');
    const playBtn = document.getElementById('playBtn');

    function render() {
      // Update segments
      segs.forEach((seg, i) => {
        if (i < currentStep) {
          seg.classList.add('active');
        } else {
          seg.classList.remove('active');
        }
      });

      // Update equation terms
      terms.forEach((term, i) => {
        if (i < currentStep) {
          term.classList.add('active');
        } else {
          term.classList.remove('active');
        }
      });

      // Update result fraction
      resNum.textContent = currentStep;
      eqRes.classList.add('active');

      // Update buttons
      stepBtns.forEach((btn, i) => {
        if (i + 1 === currentStep) {
          btn.classList.add('active');
        } else {
          btn.classList.remove('active');
        }
      });
    }

    function setStep(step) {
      currentStep = step;
      render();
    }

    function nextStep() {
      currentStep = currentStep >= 3 ? 1 : currentStep + 1;
      render();
    }

    function togglePlay() {
      isPlaying = !isPlaying;
      if (isPlaying) {
        playBtn.textContent = '⏸ Pause';
        startTimer();
      } else {
        playBtn.textContent = '▶ Play';
        clearInterval(timer);
      }
    }

    function startTimer() {
      clearInterval(timer);
      timer = setInterval(() => {
        if (isPlaying) {
          nextStep();
        }
      }, 3000);
    }

    // Initialize
    render();
    startTimer();
  </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;
      -webkit-tap-highlight-color: transparent;
    }

    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;
      min-height: 100%;
      padding: 16px 12px;
      user-select: none;
    }

    .diagram-content {
      width: 100%;
      max-width: 520px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
    }

    /* Top fraction display */
    .top-display {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .main-fraction {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      font-size: 26px;
      font-weight: 800;
      line-height: 1;
      color: #f97316;
    }

    .main-fraction .num {
      border-bottom: 2.5px solid #f97316;
      padding-bottom: 2px;
      width: 100%;
      text-align: center;
    }

    .main-fraction .denom {
      padding-top: 3px;
      color: #1e2945;
    }

    .badge-label {
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      padding: 6px 12px;
      border-radius: 20px;
      letter-spacing: 0.2px;
    }

    /* Bar container */
    .bar-section {
      width: 100%;
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .whole-bar {
      display: flex;
      width: 100%;
      height: 58px;
      border-radius: 10px;
      overflow: hidden;
      border: 2px solid #e2e8f0;
      background: #f8fafc;
      box-shadow: 0 2px 6px rgba(0,0,0,0.04);
    }

    .block {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      border-right: 1.5px solid #ffffff;
      cursor: pointer;
      transition: background-color 0.25s ease, opacity 0.25s ease;
    }

    .block:last-child {
      border-right: none;
      border-left: 1.5px dashed #cbd5e1;
    }

    .block.shaded {
      background: #f97316;
      color: #ffffff;
    }

    .block.dimmed {
      opacity: 0.35;
    }

    .block.unshaded {
      background: #f1f5f9;
      color: #94a3b8;
    }

    /* Fraction typography inside blocks */
    .frac-inline {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      font-size: 15px;
      font-weight: 700;
      line-height: 1;
      pointer-events: none;
    }

    .frac-inline .num {
      border-bottom: 1.5px solid currentColor;
      padding-bottom: 1.5px;
      width: 100%;
      text-align: center;
    }

    .frac-inline .denom {
      padding-top: 2px;
    }

    /* Bracket */
    .bracket-container {
      width: calc((5 / 6) * 100%);
      height: 22px;
      display: flex;
      align-items: center;
      margin-top: 4px;
    }

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

    /* Equation Section */
    .equation-card {
      width: 100%;
      background: #fffaf5;
      border: 1.5px solid #fed7aa;
      border-radius: 12px;
      padding: 12px 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 6px 8px;
      font-size: clamp(14px, 3.8vw, 17px);
      font-weight: 700;
      color: #1e2945;
    }

    .eq-target {
      color: #f97316;
      display: inline-flex;
      align-items: center;
    }

    .eq-symbol {
      color: #94a3b8;
      font-size: 16px;
      padding: 0 1px;
    }

    .eq-pill {
      background: #ffffff;
      border: 1.5px solid #fdba74;
      color: #f97316;
      padding: 4px 8px;
      border-radius: 8px;
      display: inline-flex;
      align-items: center;
      transition: all 0.25s ease;
      box-shadow: 0 1px 3px rgba(249, 115, 22, 0.08);
    }

    .eq-pill.dimmed {
      opacity: 0.3;
      border-color: #e2e8f0;
      color: #94a3b8;
    }

    .eq-pill.highlight {
      background: #f97316;
      color: #ffffff;
      border-color: #ea580c;
    }

    .eq-pill .frac-inline .num {
      border-bottom-color: currentColor;
    }

    /* Bottom helper note */
    .caption {
      font-size: 12px;
      font-weight: 600;
      color: #94a3b8;
      text-align: center;
    }
  </style>
</head>
<body>
  <div class="diagram-content">
    
    
    <div class="top-display">
      <div class="main-fraction">
        <span class="num">5</span>
        <span class="denom">6</span>
      </div>
      <div class="badge-label">5 of 6 equal parts</div>
    </div>

    
    <div class="bar-section">
      <div class="whole-bar" id="wholeBar">
        <div class="block shaded" data-idx="0">
          <span class="frac-inline"><span class="num">1</span><span class="denom">6</span></span>
        </div>
        <div class="block shaded" data-idx="1">
          <span class="frac-inline"><span class="num">1</span><span class="denom">6</span></span>
        </div>
        <div class="block shaded" data-idx="2">
          <span class="frac-inline"><span class="num">1</span><span class="denom">6</span></span>
        </div>
        <div class="block shaded" data-idx="3">
          <span class="frac-inline"><span class="num">1</span><span class="denom">6</span></span>
        </div>
        <div class="block shaded" data-idx="4">
          <span class="frac-inline"><span class="num">1</span><span class="denom">6</span></span>
        </div>
        <div class="block unshaded" data-idx="5">
          <span class="frac-inline"><span class="num">1</span><span class="denom">6</span></span>
        </div>
      </div>

      
      <div class="bracket-container">
        <svg class="bracket-svg" viewBox="0 0 250 20" preserveAspectRatio="none">
          <path d="M 4 2 Q 4 11 14 11 L 115 11 Q 125 11 125 19 Q 125 11 135 11 L 236 11 Q 246 11 246 2" 
                fill="none" 
                stroke="#f97316" 
                stroke-width="2.5" 
                stroke-linecap="round" />
        </svg>
      </div>
    </div>

    
    <div class="equation-card">
      <div class="eq-target">
        <span class="frac-inline"><span class="num">5</span><span class="denom">6</span></span>
      </div>
      <span class="eq-symbol">=</span>
      <div class="eq-pill" data-idx="0">
        <span class="frac-inline"><span class="num">1</span><span class="denom">6</span></span>
      </div>
      <span class="eq-symbol">+</span>
      <div class="eq-pill" data-idx="1">
        <span class="frac-inline"><span class="num">1</span><span class="denom">6</span></span>
      </div>
      <span class="eq-symbol">+</span>
      <div class="eq-pill" data-idx="2">
        <span class="frac-inline"><span class="num">1</span><span class="denom">6</span></span>
      </div>
      <span class="eq-symbol">+</span>
      <div class="eq-pill" data-idx="3">
        <span class="frac-inline"><span class="num">1</span><span class="denom">6</span></span>
      </div>
      <span class="eq-symbol">+</span>
      <div class="eq-pill" data-idx="4">
        <span class="frac-inline"><span class="num">1</span><span class="denom">6</span></span>
      </div>
    </div>

    <div class="caption">Tap pieces to highlight unit fractions</div>
  </div>

  <script>
    const blocks = document.querySelectorAll('.block.shaded');
    const pills = document.querySelectorAll('.eq-pill');
    let activeIndex = null;

    function highlightPiece(idx) {
      if (activeIndex === idx) {
        // Reset to all 5 active
        activeIndex = null;
        blocks.forEach(b => { b.classList.remove('dimmed'); });
        pills.forEach(p => { p.classList.remove('dimmed', 'highlight'); });
      } else {
        activeIndex = idx;
        blocks.forEach((b, i) => {
          if (i === idx) {
            b.classList.remove('dimmed');
          } else {
            b.classList.add('dimmed');
          }
        });
        pills.forEach((p, i) => {
          if (i === idx) {
            p.classList.remove('dimmed');
            p.classList.add('highlight');
          } else {
            p.classList.remove('highlight');
            p.classList.add('dimmed');
          }
        });
      }
    }

    blocks.forEach((block, idx) => {
      block.addEventListener('click', () => highlightPiece(idx));
    });

    pills.forEach((pill, idx) => {
      pill.addEventListener('click', () => highlightPiece(idx));
    });
  </script>
</body>
</html>

Comprendre la fraction comme partage

Nommer les fractions usuelles : demi, tiers et quart

Rôle du numérateur et du dénominateur

Lire et écrire des fractions en chiffres et en lettres

Représenter une fraction avec des figures géométriques

Fractions inférieures, supérieures ou égales à 1

Décomposer une fraction en somme d'un entier et d'une fraction inférieure à 1

math

Bases et représentations des fractions

Understanding Unit Fractions as Building Blocks

Writing Fractions as Sums of Unit Fractions

Decomposing Fractions with Area Models

Decomposing Fractions on Number Lines

Decomposing Fractions in More Than One Way

Recording Fraction Decompositions with Equations

Decomposing Fractions into Unit Fractions

Liczby całkowite na osi liczbowej

Dodawanie liczb całkowitych

Odejmowanie liczb całkowitych

Mnożenie liczb całkowitych

Dzielenie liczb całkowitych

Kolejność działań z liczbami całkowitymi

Liczby całkowite – działania i porządkowanie

Découvrir les fractions décimales : dixièmes et centièmes

Passer d'une fraction décimale à un nombre décimal

Partager une collection d'objets avec des fractions

Partager des longueurs avec des fractions

Identifier des parts non égales : pièges du partage

Fractions et unités de mesure usuelles

Modéliser des situations de partage avec des fractions

Décomposer les fractions en somme de fractions unitaires

Synthèse : le sens fondamental des fractions

Fractions décimales, grandeurs et applications du partage

Introducing Mixed Numbers

Understanding Improper Fractions When a Is Greater Than b

Converting Between Mixed Numbers and Improper Fractions

Multiplying Fractions by Whole Numbers: What It Means

Multiplying Fractions by Whole Numbers: Finding the Product

Fraction Decomposition Word Problems

Mixed Numbers, Improper Fractions, and Whole Number Multiplication

Dodawanie i odejmowanie ułamków zwykłych

Mnożenie ułamków zwykłych

Dzielenie ułamków zwykłych

Dodawanie i odejmowanie ułamków dziesiętnych

Mnożenie i dzielenie ułamków dziesiętnych

Zamiana ułamków zwykłych na dziesiętne i odwrotnie

Działania łączne na ułamkach

Wartość bezwzględna liczby

Zastosowania liczb całkowitych w zadaniach

Ułamki zwykłe i dziesiętne – działania i zastosowania

Breaking Proper Fractions in Multiple Ways

Breaking Improper Fractions into Wholes and Parts

Counting by Fractions and Mixed Numbers on a Number Line

Converting Improper Fractions to Mixed Numbers Using Models

Converting Between Improper Fractions and Mixed Numbers

Breaking Mixed Numbers with Regrouping

Fraction Decomposition, Number Lines, and Mixed Numbers

Comprendre le sens quotient d'une fraction

Relier une fraction au résultat exact d'une division

Compléter des égalités multiplicatives à trous

Quotient exact et quotient approché

Fractions représentant des nombres entiers

Passer d'une fraction à un nombre décimal

Fractions représentant des nombres non décimaux

Calculer le quotient décimal d'une fraction par division posée

La fraction comme quotient et écriture décimale

Finding Equivalent Fractions with Area Models

Finding Equivalent Fractions by Multiplying

Finding Equivalent Fractions by Dividing

Simplifying Fractions to Simplest Form

Generating Lists of Equivalent Fractions

Equivalent Fractions on Number Lines

Understanding Equivalent Fractions

Counting by Fractions on a Number Line

Understanding Mixed Numerals

Locating Mixed Numbers on Number Lines

Counting by Mixed Numerals

Mixed Numerals

Traduire un partage non entier par une fraction

Résoudre des égalités de type a × ? = b

Estimer l'ordre de grandeur d'un quotient

Encadrer un quotient entre deux entiers consécutifs

Utilisation de la calculatrice pour explorer les quotients

Quotient de deux grandeurs et situations de mesure

Propriété fondamentale : multiplier la fraction par son dénominateur

Synthèse : la fraction comme nouveau nombre quotient

Utiliser la fraction quotient : encadrements, propriétés et problèmes

Understanding Fraction Addition with Models

Adding Fractions with Like Denominators

Subtracting Fractions with Like Denominators

Adding Fractions on Number Lines

Decomposing to Subtract Fractions

Adding and Subtracting Fractions with Like Denominators

Connecting Tenths to Decimals

Connecting Hundredths to Decimals

Placing Mixed Numbers and Decimals on the Same Number Line

Converting Fractions to Decimals with Tenths and Hundredths

Fractions and Decimals

Placer des fractions sur une droite numérique

Choisir le bon pas de graduation pour une fraction

Graduer un segment de longueur donnée

Lire l'abscisse fractionnaire d'un point

Placer des fractions supérieures à 1 sur la droite

Placer des fractions décimales sur une ligne graduée

Comparer visuellement des fractions sur la droite

Initiation au repérage de fractions sur demi-droite graduée

Comprendre le rôle du numérateur et du dénominateur

Lire et nommer les fractions usuelles

Représenter une fraction par le coloriage d'une surface

Représenter une fraction sur un segment de longueur donnée

Reconnaître si une fraction est inférieure, égale ou supérieure à 1

Les fractions : sens du partage, lecture et représentations géométriques

Écrire la somme d'un entier et d'une fraction inférieure à 1 comme une unique fraction

OGM.5.NF.3

Aligned learning resources

Related diagrams