<!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>Fraction Comparison: 3/8 vs 5/12</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e293b;
      background: transparent;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 16px;
      justify-content: center;
      min-height: 100%;
    }

    /* Common Math Fraction Stacking */
    .frac {
      display: inline-flex;
      flex-direction: column;
      vertical-align: middle;
      text-align: center;
      font-weight: 700;
      line-height: 1;
      font-size: 1.15rem;
    }
    .frac .num {
      padding-bottom: 2px;
      border-bottom: 2px solid currentColor;
    }
    .frac .den {
      padding-top: 2px;
    }

    .frac-lg {
      font-size: 1.35rem;
    }

    /* TOP SECTION: Conversion Pathways */
    .pathways-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
    }

    .pathway {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 8px;
      border-radius: 12px;
    }

    .pathway-blue {
      background: #eff6ff;
      color: #1d4ed8;
      border: 1px solid #bfdbfe;
    }

    .pathway-purple {
      background: #f5f3ff;
      color: #6d28d9;
      border: 1px solid #ddd6fe;
    }

    .multiplier-col {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
    }

    .multiplier-badge {
      font-size: 0.72rem;
      font-weight: 800;
      padding: 1px 5px;
      border-radius: 4px;
      letter-spacing: -0.2px;
    }

    .badge-blue {
      background: #dbeafe;
      color: #1e40af;
    }

    .badge-purple {
      background: #ede9fe;
      color: #5b21b6;
    }

    .arrow-svg {
      width: 28px;
      height: 14px;
    }

    /* MIDDLE SECTION: 24-Segment Fraction Bars */
    .bars-container {
      display: flex;
      flex-direction: column;
      gap: 12px;
      position: relative;
      padding: 4px 0 10px;
    }

    .bar-row {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .bar-label {
      width: 48px;
      flex-shrink: 0;
      text-align: right;
    }

    .bar-track {
      flex: 1;
      display: grid;
      grid-template-columns: repeat(24, 1fr);
      height: 28px;
      background: #e2e8f0;
      border-radius: 6px;
      overflow: hidden;
      gap: 1px;
      padding: 1px;
      background-color: #cbd5e1;
    }

    .seg {
      background: #e2e8f0;
      height: 100%;
      border-radius: 1px;
    }

    /* Blue segments */
    .seg-blue {
      background: #3b82f6;
    }

    /* Purple segments */
    .seg-purple {
      background: #8b5cf6;
    }

    /* Extra +1/24 highlighted segment */
    .seg-extra {
      background: #a855f7;
      position: relative;
      box-shadow: inset 0 0 0 2px #f59e0b;
      animation: pulse-border 2s infinite ease-in-out;
    }

    @keyframes pulse-border {
      0%, 100% { box-shadow: inset 0 0 0 2px #f59e0b; }
      50% { box-shadow: inset 0 0 0 2px #fbbf24, 0 0 6px rgba(245, 158, 11, 0.6); }
    }

    /* Diff indicator overlay */
    .diff-callout-wrap {
      display: flex;
      align-items: center;
      margin-left: 58px; /* Offset for bar-label */
      position: relative;
      height: 18px;
    }

    .diff-bracket {
      position: absolute;
      left: 37.5%; /* 9/24 */
      width: 4.166%; /* 1/24 */
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .diff-line {
      width: 100%;
      border-bottom: 2px solid #d97706;
      border-left: 2px solid #d97706;
      border-right: 2px solid #d97706;
      height: 4px;
    }

    .diff-tag {
      font-size: 0.7rem;
      font-weight: 800;
      color: #b45309;
      white-space: nowrap;
      margin-top: 1px;
    }

    /* BOTTOM SECTION: Math Conclusion */
    .conclusion {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 6px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 14px;
    }

    .math-statement {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      font-size: 1.25rem;
      font-weight: 800;
    }

    .comp-symbol {
      color: #0f172a;
      font-size: 1.4rem;
    }

    .arrow-trans {
      color: #64748b;
      font-weight: 700;
      font-size: 1.2rem;
    }

    .c-blue {
      color: #2563eb;
    }

    .c-purple {
      color: #7c3aed;
    }

    .caption {
      font-size: 0.8rem;
      font-weight: 600;
      color: #475569;
    }

    @media (max-width: 420px) {
      body {
        padding: 6px;
        gap: 10px;
      }
      .pathway {
        padding: 6px 4px;
        gap: 4px;
      }
      .frac {
        font-size: 1rem;
      }
      .frac-lg {
        font-size: 1.15rem;
      }
      .arrow-svg {
        width: 20px;
      }
      .bar-label {
        width: 38px;
      }
      .diff-callout-wrap {
        margin-left: 48px;
      }
      .math-statement {
        gap: 8px;
      }
    }
  </style>
</head>
<body>

  
  <div class="pathways-grid">
    
    
    <div class="pathway pathway-blue">
      <div class="frac">
        <span class="num">3</span>
        <span class="den">8</span>
      </div>

      <div class="multiplier-col">
        <span class="multiplier-badge badge-blue">×3</span>
        <svg class="arrow-svg" viewBox="0 0 28 12" fill="none">
          <path d="M1 6H24M24 6L19 2M24 6L19 10" stroke="#2563eb" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
        </svg>
        <span class="multiplier-badge badge-blue">×3</span>
      </div>

      <div class="frac">
        <span class="num">9</span>
        <span class="den">24</span>
      </div>
    </div>

    
    <div class="pathway pathway-purple">
      <div class="frac">
        <span class="num">5</span>
        <span class="den">12</span>
      </div>

      <div class="multiplier-col">
        <span class="multiplier-badge badge-purple">×2</span>
        <svg class="arrow-svg" viewBox="0 0 28 12" fill="none">
          <path d="M1 6H24M24 6L19 2M24 6L19 10" stroke="#7c3aed" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
        </svg>
        <span class="multiplier-badge badge-purple">×2</span>
      </div>

      <div class="frac">
        <span class="num">10</span>
        <span class="den">24</span>
      </div>
    </div>

  </div>

  
  <div class="bars-container">
    
    
    <div class="bar-row">
      <div class="bar-label c-blue">
        <div class="frac">
          <span class="num">9</span>
          <span class="den">24</span>
        </div>
      </div>
      <div class="bar-track" id="bar1">
        
        <div class="seg seg-blue"></div><div class="seg seg-blue"></div><div class="seg seg-blue"></div>
        <div class="seg seg-blue"></div><div class="seg seg-blue"></div><div class="seg seg-blue"></div>
        <div class="seg seg-blue"></div><div class="seg seg-blue"></div><div class="seg seg-blue"></div>
        <div class="seg"></div><div class="seg"></div><div class="seg"></div>
        <div class="seg"></div><div class="seg"></div><div class="seg"></div>
        <div class="seg"></div><div class="seg"></div><div class="seg"></div>
        <div class="seg"></div><div class="seg"></div><div class="seg"></div>
        <div class="seg"></div><div class="seg"></div><div class="seg"></div>
      </div>
    </div>

    
    <div class="bar-row">
      <div class="bar-label c-purple">
        <div class="frac">
          <span class="num">10</span>
          <span class="den">24</span>
        </div>
      </div>
      <div class="bar-track" id="bar2">
        
        <div class="seg seg-purple"></div><div class="seg seg-purple"></div><div class="seg seg-purple"></div>
        <div class="seg seg-purple"></div><div class="seg seg-purple"></div><div class="seg seg-purple"></div>
        <div class="seg seg-purple"></div><div class="seg seg-purple"></div><div class="seg seg-purple"></div>
        <div class="seg seg-extra" title="+1/24 extra part"></div>
        <div class="seg"></div><div class="seg"></div><div class="seg"></div>
        <div class="seg"></div><div class="seg"></div><div class="seg"></div>
        <div class="seg"></div><div class="seg"></div><div class="seg"></div>
        <div class="seg"></div><div class="seg"></div><div class="seg"></div>
        <div class="seg"></div><div class="seg"></div>
      </div>
    </div>

    
    <div class="diff-callout-wrap">
      <div class="diff-bracket">
        <div class="diff-line"></div>
        <span class="diff-tag">+<span style="font-size:0.65rem">1</span>/<span style="font-size:0.65rem">24</span></span>
      </div>
    </div>

  </div>

  
  <div class="conclusion">
    <div class="math-statement">
      <span class="frac-lg c-purple"><span class="frac"><span class="num">10</span><span class="den">24</span></span></span>
      <span class="comp-symbol">&gt;</span>
      <span class="frac-lg c-blue"><span class="frac"><span class="num">9</span><span class="den">24</span></span></span>
      <span class="arrow-trans">➔</span>
      <span class="frac-lg c-purple"><span class="frac"><span class="num">5</span><span class="den">12</span></span></span>
      <span class="comp-symbol">&gt;</span>
      <span class="frac-lg c-blue"><span class="frac"><span class="num">3</span><span class="den">8</span></span></span>
    </div>
    <div class="caption">10 parts of <sup>1</sup>/<sub>24</sub> is greater than 9 parts of <sup>1</sup>/<sub>24</sub></div>
  </div>

</body>
</html>

Justifying Fraction Comparisons with Multiple Representations

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html, body {
      width: 100%;
      height: 100%;
      background: #ffffff;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      display: flex;
      align-items: center;
      justify-content: center;
      user-select: none;
      overflow: hidden;
    }
    .diagram-container {
      width: 100%;
      max-width: 620px;
      padding: 8px 12px;
      display: flex;
      justify-content: center;
    }
    .diagram-svg {
      width: 100%;
      height: auto;
      display: block;
    }
    .interactive-group {
      cursor: pointer;
      transition: filter 0.2s ease, opacity 0.2s ease;
    }
    .interactive-group:hover {
      filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.12));
    }
    .interactive-group:hover .card-bg {
      stroke-width: 2px;
    }
  </style>
</head>
<body>
  <div class="diagram-container">
    <svg class="diagram-svg" viewBox="0 0 620 260" preserveAspectRatio="xMidYMid meet">
      <defs>
        <filter id="card-shadow" x="-10%" y="-10%" width="120%" height="125%">
          <feDropShadow dx="0" dy="2" stdDeviation="3" flood-color="#0f172a" flood-opacity="0.07" />
        </filter>
        <filter id="badge-shadow" x="-10%" y="-10%" width="120%" height="125%">
          <feDropShadow dx="0" dy="1.5" stdDeviation="2" flood-color="#312e81" flood-opacity="0.12" />
        </filter>
      </defs>

      
      <line x1="310" y1="52" x2="310" y2="135" stroke="#cbd5e1" stroke-width="1.5" stroke-dasharray="3 3" />

      
      
      <path d="M 283.3 64 
               C 283.3 46, 316.7 48, 316.7 32 
               C 316.7 48, 350.0 46, 350.0 64" 
            fill="none" stroke="#6366f1" stroke-width="2.5" stroke-linecap="round" />

      
      <g transform="translate(316.7, 22)" filter="url(#badge-shadow)">
        <rect x="-62" y="-14" width="124" height="28" rx="14" fill="#eef2ff" stroke="#c7d2fe" stroke-width="1.5" />
        <text x="0" y="4.5" text-anchor="middle" font-size="14" font-weight="700" fill="#4338ca">
          <tspan fill="#e11d48">4/9</tspan>
          <tspan fill="#4338ca"> &lt; </tspan>
          <tspan fill="#16a34a">7/12</tspan>
        </text>
      </g>

      
      
      
      <line x1="45" y1="95" x2="575" y2="95" stroke="#e2e8f0" stroke-width="6" stroke-linecap="round" />

      
      
      <line x1="70" y1="95" x2="310" y2="95" stroke="#fecdd3" stroke-width="5" />
      
      <line x1="310" y1="95" x2="550" y2="95" stroke="#bbf7d0" stroke-width="5" />

      
      <line x1="70" y1="95" x2="550" y2="95" stroke="#1e2945" stroke-width="2" />

      
      <line x1="70" y1="84" x2="70" y2="106" stroke="#1e2945" stroke-width="2.5" stroke-linecap="round" />
      <text x="70" y="125" text-anchor="middle" font-size="15" font-weight="600" fill="#64748b">0</text>

      
      <line x1="550" y1="84" x2="550" y2="106" stroke="#1e2945" stroke-width="2.5" stroke-linecap="round" />
      <text x="550" y="125" text-anchor="middle" font-size="15" font-weight="600" fill="#64748b">1</text>

      
      <line x1="310" y1="80" x2="310" y2="110" stroke="#2563eb" stroke-width="3" stroke-linecap="round" />
      <g transform="translate(310, 126)">
        <rect x="-18" y="-11" width="36" height="22" rx="5" fill="#eff6ff" stroke="#bfdbfe" stroke-width="1.2" />
        <text x="0" y="4" text-anchor="middle" font-size="13" font-weight="700" fill="#1d4ed8">1/2</text>
      </g>

      
      
      <g class="interactive-group" id="group-49">
        
        <line x1="283.3" y1="66" x2="283.3" y2="95" stroke="#e11d48" stroke-width="1.5" stroke-dasharray="2 2" />
        
        
        <circle cx="283.3" cy="95" r="5.5" fill="#e11d48" stroke="#ffffff" stroke-width="2" />
        
        
        <path d="M 283.3 103 L 235 152 L 275 152 Q 275 152 275 152 L 275 240 Q 275 246 269 246 L 51 246 Q 45 246 45 240 L 45 158 Q 45 152 51 152 L 205 152 Z" 
              class="card-bg" fill="#fff1f2" stroke="#fecdd3" stroke-width="1.2" filter="url(#card-shadow)" />

        <text x="160" y="176" text-anchor="middle" font-size="14" font-weight="700" fill="#be123c">
          4/9 &lt; 1/2
        </text>
        <text x="160" y="198" text-anchor="middle" font-size="12.5" font-weight="600" fill="#9f1239">
          since 4 &lt; 4.5
        </text>
        <text x="160" y="222" text-anchor="middle" font-size="11" font-weight="500" fill="#be123c" opacity="0.85">
          (4.5 is half of 9)
        </text>
      </g>

      
      
      <g class="interactive-group" id="group-712">
        
        <line x1="350.0" y1="66" x2="350.0" y2="95" stroke="#16a34a" stroke-width="1.5" stroke-dasharray="2 2" />
        
        
        <circle cx="350.0" cy="95" r="5.5" fill="#16a34a" stroke="#ffffff" stroke-width="2" />
        
        
        <path d="M 350 103 L 385 152 L 345 152 Q 345 152 345 152 L 345 240 Q 345 246 351 246 L 569 246 Q 575 246 575 240 L 575 158 Q 575 152 569 152 L 415 152 Z" 
              class="card-bg" fill="#f0fdf4" stroke="#bbf7d0" stroke-width="1.2" filter="url(#card-shadow)" />

        <text x="460" y="176" text-anchor="middle" font-size="14" font-weight="700" fill="#15803d">
          7/12 &gt; 1/2
        </text>
        <text x="460" y="198" text-anchor="middle" font-size="12.5" font-weight="600" fill="#14532d">
          since 7 &gt; 6
        </text>
        <text x="460" y="222" text-anchor="middle" font-size="11" font-weight="500" fill="#15803d" opacity="0.85">
          (6 is half of 12)
        </text>
      </g>
    </svg>
  </div>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>b6</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      width: 100%;
      min-height: 100%;
      background: #ffffff;
      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;
      padding: 16px 12px;
      gap: 14px;
    }
    .diagram-area {
      width: 100%;
      max-width: 520px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      position: relative;
    }
    .bar-row {
      display: flex;
      flex-direction: column;
      gap: 5px;
      position: relative;
      z-index: 2;
    }
    .bar-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      font-size: 14px;
    }
    .fraction-title {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .badge {
      font-size: 11px;
      font-weight: 600;
      padding: 2px 6px;
      border-radius: 4px;
    }
    .badge-blue { background: #e0f2fe; color: #0284c7; }
    .badge-green { background: #dcfce7; color: #16a34a; }

    .bar-track {
      position: relative;
      width: 100%;
      height: 44px;
      display: flex;
      background: #ffffff;
      border: 2px solid #e6e6e6;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 1px 2px rgba(0,0,0,0.04);
    }
    .segment {
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 700;
      border-right: 1.5px solid rgba(255, 255, 255, 0.45);
      position: relative;
      z-index: 3;
      user-select: none;
      transition: opacity 0.25s ease, background-color 0.25s ease, color 0.25s ease;
    }
    .segment:last-child {
      border-right: none;
    }

    /* 4-part bar */
    .bar-4 .seg-shaded {
      width: 25%;
      background: #0ea5e9;
      color: #ffffff;
    }
    .bar-4 .seg-missing {
      width: 25%;
      background: #f8fafc;
      color: #64748b;
      font-size: 12px;
      font-weight: 600;
      border-left: 2px dashed #cbd5e1;
      white-space: nowrap;
      padding: 0 2px;
    }

    /* 6-part bar */
    .bar-6 .seg-shaded {
      width: 16.666%;
      background: #22c55e;
      color: #ffffff;
    }
    .bar-6 .seg-missing {
      width: 16.666%;
      background: #f8fafc;
      color: #64748b;
      font-size: 11px;
      font-weight: 600;
      border-left: 2px dashed #cbd5e1;
      white-space: nowrap;
      padding: 0 1px;
      letter-spacing: -0.2px;
    }

    /* Comparison Connector Section in between the bars */
    .comparison-zone {
      position: relative;
      height: 28px;
      width: 100%;
      display: flex;
      align-items: center;
    }
    .guide-line {
      position: absolute;
      top: -4px;
      bottom: -4px;
      width: 0;
      border-left: 2px dashed #d97706;
      z-index: 1;
      pointer-events: none;
    }
    .guide-3-4 {
      left: 75%;
    }
    .guide-5-6 {
      left: 83.333%;
    }
    .diff-span {
      position: absolute;
      left: 75%;
      width: 8.333%;
      top: 3px;
      bottom: 3px;
      background: rgba(245, 158, 11, 0.15);
      border-top: 1.5px solid #d97706;
      border-bottom: 1.5px solid #d97706;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 10px;
      font-weight: 700;
      color: #b45309;
      pointer-events: none;
    }
    .diff-label {
      position: absolute;
      left: 75%;
      transform: translateX(-50%);
      font-size: 10px;
      font-weight: 700;
      color: #b45309;
      background: #fef3c7;
      padding: 1px 4px;
      border-radius: 3px;
      white-space: nowrap;
    }
    .diff-label-right {
      position: absolute;
      left: 83.333%;
      transform: translateX(-50%);
      font-size: 10px;
      font-weight: 700;
      color: #15803d;
      background: #dcfce7;
      padding: 1px 4px;
      border-radius: 3px;
      white-space: nowrap;
    }

    .callout {
      width: 100%;
      max-width: 520px;
      background: #f8fafc;
      border: 1.5px solid #e6e6e6;
      border-left: 4px solid #0ea5e9;
      border-radius: 6px;
      padding: 9px 12px;
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
      text-align: center;
      line-height: 1.4;
    }
    .callout span.hl {
      color: #0284c7;
      font-weight: 800;
    }

    .interactive-panel {
      display: flex;
      gap: 8px;
      justify-content: center;
      width: 100%;
      max-width: 520px;
    }
    .btn-toggle {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #1e2945;
      padding: 6px 12px;
      font-size: 12px;
      font-weight: 600;
      border-radius: 6px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 5px;
      transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    }
    .btn-toggle:hover {
      background: #f1f5f9;
    }
    .btn-toggle.active {
      background: #1e2945;
      border-color: #1e2945;
      color: #ffffff;
    }

    /* Missing Highlight Mode */
    .highlight-missing .seg-shaded {
      opacity: 0.3;
    }
    .highlight-missing .seg-missing {
      background: #fee2e2;
      color: #b91c1c;
      border-left-color: #f87171;
      font-weight: 700;
    }
    .highlight-missing .callout {
      border-left-color: #ef4444;
    }

    /* Responsive adjustments for narrow screens (350px) */
    @media (max-width: 420px) {
      body {
        padding: 10px 8px;
        gap: 10px;
      }
      .diagram-area {
        gap: 8px;
      }
      .bar-header {
        font-size: 12.5px;
      }
      .badge {
        font-size: 10px;
        padding: 1px 4px;
      }
      .bar-track {
        height: 38px;
      }
      .segment {
        font-size: 11px;
      }
      .bar-4 .seg-missing {
        font-size: 10.5px;
        padding: 0 1px;
      }
      .bar-6 .seg-missing {
        font-size: 9.5px;
        letter-spacing: -0.4px;
        padding: 0 1px;
      }
      .comparison-zone {
        height: 22px;
      }
      .callout {
        font-size: 11.5px;
        padding: 7px 8px;
      }
      .btn-toggle {
        font-size: 11.5px;
        padding: 5px 10px;
      }
    }
  </style>
</head>
<body>

  <div class="diagram-area" id="diagram">
    
    <div class="bar-row">
      <div class="bar-header">
        <div class="fraction-title">
          <span>3/4</span>
          <span class="badge badge-blue">3 of 4 equal parts</span>
        </div>
      </div>
      <div class="bar-track bar-4">
        <div class="segment seg-shaded">1/4</div>
        <div class="segment seg-shaded">1/4</div>
        <div class="segment seg-shaded">1/4</div>
        <div class="segment seg-missing">Missing 1/4</div>
      </div>
    </div>

    
    <div class="comparison-zone">
      <div class="guide-line guide-3-4" title="3/4 mark"></div>
      <div class="guide-line guide-5-6" title="5/6 mark"></div>
      <div class="diff-span" title="Difference: 5/6 is longer by 1/12"></div>
      <div class="diff-label">3/4</div>
      <div class="diff-label-right">5/6</div>
    </div>

    
    <div class="bar-row">
      <div class="bar-header">
        <div class="fraction-title">
          <span>5/6</span>
          <span class="badge badge-green">5 of 6 equal parts</span>
        </div>
      </div>
      <div class="bar-track bar-6">
        <div class="segment seg-shaded">1/6</div>
        <div class="segment seg-shaded">1/6</div>
        <div class="segment seg-shaded">1/6</div>
        <div class="segment seg-shaded">1/6</div>
        <div class="segment seg-shaded">1/6</div>
        <div class="segment seg-missing">Missing 1/6</div>
      </div>
    </div>
  </div>

  <div class="callout" id="calloutText">
    <b>Smaller missing piece</b> (<span class="hl">1/6 &lt; 1/4</span>) = <b>Larger fraction remaining</b> (<span class="hl">5/6 &gt; 3/4</span>)
  </div>

  <div class="interactive-panel">
    <button class="btn-toggle active" id="btnCompare">Compare Bars</button>
    <button class="btn-toggle" id="btnMissing">Compare Missing Pieces</button>
  </div>

  <script>
    const diagram = document.getElementById('diagram');
    const btnCompare = document.getElementById('btnCompare');
    const btnMissing = document.getElementById('btnMissing');
    const callout = document.getElementById('calloutText');

    btnCompare.addEventListener('click', () => {
      btnCompare.classList.add('active');
      btnMissing.classList.remove('active');
      diagram.classList.remove('highlight-missing');
      callout.innerHTML = '<b>Smaller missing piece</b> (<span class="hl">1/6 &lt; 1/4</span>) = <b>Larger fraction remaining</b> (<span class="hl">5/6 &gt; 3/4</span>)';
    });

    btnMissing.addEventListener('click', () => {
      btnMissing.classList.add('active');
      btnCompare.classList.remove('active');
      diagram.classList.add('highlight-missing');
      callout.innerHTML = 'Missing piece for <b>5/6</b> is only <b>1/6</b>, while <b>3/4</b> misses a larger <b>1/4</b> piece.';
    });
  </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 {
      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: 8px;
    }
    .svg-container {
      width: 100%;
      max-width: 580px;
      height: auto;
      display: block;
    }
    .shaded {
      fill: #059669;
      transition: fill 0.2s ease, opacity 0.2s ease;
      cursor: pointer;
    }
    .shaded:hover {
      fill: #047857;
      opacity: 0.9;
    }
    .unshaded {
      fill: #f8fafc;
      stroke: #cbd5e1;
      stroke-dasharray: 4 3;
    }
    .grid-line {
      stroke: #ffffff;
      stroke-width: 1.5;
    }
    .outer-frame {
      stroke: #047857;
      stroke-width: 2;
      fill: none;
    }
    .unit-frame {
      stroke: #047857;
      stroke-width: 1.5;
      fill: none;
    }
    .dash-line {
      stroke: #d97706;
      stroke-width: 2;
      stroke-dasharray: 5 4;
    }
    .label {
      font-size: 13px;
      font-weight: 600;
      fill: #1e2945;
      text-anchor: middle;
      dominant-baseline: central;
    }
    .label-muted {
      font-size: 11px;
      font-weight: 500;
      fill: #64748b;
      text-anchor: middle;
      dominant-baseline: central;
    }
    .label-amber {
      font-size: 11px;
      font-weight: 700;
      fill: #b45309;
      text-anchor: start;
      dominant-baseline: central;
    }
    .cell-num {
      font-size: 11px;
      font-weight: 700;
      fill: #ffffff;
      text-anchor: middle;
      dominant-baseline: central;
      pointer-events: none;
    }
    .bracket {
      stroke: #475569;
      stroke-width: 1.5;
      fill: none;
    }
    .equation-bar {
      margin-top: 6px;
      background: #f1f5f9;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 6px 16px;
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .frac {
      display: inline-flex;
      flex-direction: column;
      vertical-align: middle;
      text-align: center;
      font-size: 13px;
      line-height: 1;
    }
    .frac-top {
      border-bottom: 1.5px solid currentColor;
      padding-bottom: 1px;
    }
    .frac-bot {
      padding-top: 1px;
    }
    .mixed {
      display: inline-flex;
      align-items: center;
      gap: 2px;
    }
    .tag {
      color: #059669;
      font-weight: 800;
    }
  </style>
</head>
<body>

  <svg class="svg-container" viewBox="0 0 560 265">
    
    
    
    <path class="bracket" d="M 40,42 L 40,36 L 100,36 L 100,30 L 100,36 L 160,36 L 160,42" />
    <text class="label" x="100" y="20">Width = 2</text>

    
    <path class="bracket" d="M 32,46 L 26,46 L 26,110 L 20,110 L 26,110 L 26,174 L 32,174" />
    <text class="label" x="12" y="110">
      <tspan x="10" dy="-8">4</tspan>
      <tspan x="10" dy="16">3</tspan>
    </text>
    <line x1="3" y1="110" x2="17" y2="110" stroke="#1e2945" stroke-width="1.5" />

    
    
    <rect id="L1" class="shaded" x="40" y="46" width="60" height="32" />
    <text class="cell-num" x="70" y="62">1/3</text>

    <rect id="L2" class="shaded" x="40" y="78" width="60" height="32" />
    <text class="cell-num" x="70" y="94">1/3</text>

    <rect id="L3" class="shaded" x="40" y="110" width="60" height="32" />
    <text class="cell-num" x="70" y="126">1/3</text>

    <rect id="L4" class="shaded" x="40" y="142" width="60" height="32" />
    <text class="cell-num" x="70" y="158">1/3</text>

    
    <rect id="L5" class="shaded" x="100" y="46" width="60" height="32" />
    <text class="cell-num" x="130" y="62">1/3</text>

    <rect id="L6" class="shaded" x="100" y="78" width="60" height="32" />
    <text class="cell-num" x="130" y="94">1/3</text>

    <rect id="L7" class="shaded" x="100" y="110" width="60" height="32" />
    <text class="cell-num" x="130" y="126">1/3</text>

    <rect id="L8" class="shaded" x="100" y="142" width="60" height="32" />
    <text class="cell-num" x="130" y="158">1/3</text>

    
    <line class="grid-line" x1="40" y1="78" x2="160" y2="78" />
    <line class="grid-line" x1="40" y1="110" x2="160" y2="110" />
    <line class="grid-line" x1="40" y1="142" x2="160" y2="142" />
    <line class="grid-line" x1="100" y1="46" x2="100" y2="174" />

    
    <line class="dash-line" x1="36" y1="78" x2="164" y2="78" />
    <text class="label-amber" x="168" y="78">1 whole height</text>

    
    <rect class="outer-frame" x="40" y="46" width="120" height="128" rx="2" />
    
    
    <text class="label" x="100" y="196">2 × 4 thirds = 8 thirds</text>
    <text class="label-muted" x="100" y="212">Total area: 8/3</text>

    
    <g transform="translate(242, 110)">
      <circle cx="12" cy="0" r="16" fill="#ecfdf5" stroke="#a7f3d0" stroke-width="1.5" />
      <path d="M 6,-4 L 14,0 L 6,4" fill="none" stroke="#059669" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" />
      <text class="label-muted" x="12" y="26">rearrange</text>
    </g>

    
    
    <g>
      <rect id="R1" class="shaded" x="290" y="78" width="60" height="32" />
      <text class="cell-num" x="320" y="94">1/3</text>
      <rect id="R2" class="shaded" x="290" y="110" width="60" height="32" />
      <text class="cell-num" x="320" y="126">1/3</text>
      <rect id="R3" class="shaded" x="290" y="142" width="60" height="32" />
      <text class="cell-num" x="320" y="158">1/3</text>
      <line class="grid-line" x1="290" y1="110" x2="350" y2="110" />
      <line class="grid-line" x1="290" y1="142" x2="350" y2="142" />
      <rect class="unit-frame" x="290" y="78" width="60" height="96" rx="2" />
      <text class="label" x="320" y="196">1</text>
      <text class="label-muted" x="320" y="212">(3/3)</text>
    </g>

    <text class="label" x="362" y="126" font-size="16">+</text>

    
    <g>
      <rect id="R4" class="shaded" x="374" y="78" width="60" height="32" />
      <text class="cell-num" x="404" y="94">1/3</text>
      <rect id="R5" class="shaded" x="374" y="110" width="60" height="32" />
      <text class="cell-num" x="404" y="126">1/3</text>
      <rect id="R6" class="shaded" x="374" y="142" width="60" height="32" />
      <text class="cell-num" x="404" y="158">1/3</text>
      <line class="grid-line" x1="374" y1="110" x2="434" y2="110" />
      <line class="grid-line" x1="374" y1="142" x2="434" y2="142" />
      <rect class="unit-frame" x="374" y="78" width="60" height="96" rx="2" />
      <text class="label" x="404" y="196">1</text>
      <text class="label-muted" x="404" y="212">(3/3)</text>
    </g>

    <text class="label" x="446" y="126" font-size="16">+</text>

    
    <g>
      <rect class="unshaded" x="458" y="78" width="60" height="32" />
      <rect id="R7" class="shaded" x="458" y="110" width="60" height="32" />
      <text class="cell-num" x="488" y="126">1/3</text>
      <rect id="R8" class="shaded" x="458" y="142" width="60" height="32" />
      <text class="cell-num" x="488" y="158">1/3</text>
      <line class="grid-line" x1="458" y1="142" x2="518" y2="142" />
      <rect class="unit-frame" x="458" y="78" width="60" height="96" rx="2" />
      <text class="label" x="488" y="196">2/3</text>
      <text class="label-muted" x="488" y="212">(2/3)</text>
    </g>
  </svg>

  
  <div class="equation-bar">
    <span>2 × </span>
    <span class="frac"><span class="frac-top">4</span><span class="frac-bot">3</span></span>
    <span>=</span>
    <span class="frac tag"><span class="frac-top">8</span><span class="frac-bot">3</span></span>
    <span>=</span>
    <span class="mixed tag">2<span class="frac"><span class="frac-top">2</span><span class="frac-bot">3</span></span></span>
  </div>

  <script>
    // Link interactive highlights between corresponding thirds
    for (let i = 1; i <= 8; i++) {
      const leftEl = document.getElementById('L' + i);
      const rightEl = document.getElementById('R' + i);
      if (leftEl && rightEl) {
        const highlight = (active) => {
          const col = active ? '#047857' : '#059669';
          leftEl.style.fill = col;
          rightEl.style.fill = col;
        };
        leftEl.addEventListener('mouseenter', () => highlight(true));
        leftEl.addEventListener('mouseleave', () => highlight(false));
        rightEl.addEventListener('mouseenter', () => highlight(true));
        rightEl.addEventListener('mouseleave', () => highlight(false));
      }
    }
  </script>
</body>
</html>

Representing Whole Number × Fraction with Area Models

<!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>Scaling Rules with Whole Numbers</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #1e293b;
      background: #ffffff;
      padding: 10px 12px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    /* Scaling cards */
    .cards-container {
      display: flex;
      flex-direction: column;
      gap: 8px;
      width: 100%;
    }

    .rule-card {
      border-radius: 8px;
      padding: 9px 12px;
      border: 1.5px solid transparent;
      display: flex;
      flex-direction: column;
      gap: 6px;
      transition: box-shadow 0.2s ease, border-color 0.2s ease;
      cursor: pointer;
    }

    .rule-card.active {
      box-shadow: 0 3px 10px rgba(0, 0, 0, 0.06);
    }

    /* Card Themes */
    .card-shrink {
      background: #fffbeb;
      border-color: #fde68a;
    }
    .card-shrink.active {
      border-color: #d97706;
    }

    .card-same {
      background: #f8fafc;
      border-color: #e2e8f0;
    }
    .card-same.active {
      border-color: #64748b;
    }

    .card-grow {
      background: #eff6ff;
      border-color: #bfdbfe;
    }
    .card-grow.active {
      border-color: #2563eb;
    }

    /* Header inside card */
    .card-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 6px;
    }

    .condition {
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .card-shrink .condition { color: #b45309; }
    .card-same .condition { color: #475569; }
    .card-grow .condition { color: #1d4ed8; }

    .equation {
      font-size: 15px;
      font-weight: 800;
      display: inline-flex;
      align-items: center;
      gap: 2px;
    }

    /* Fraction styling */
    .frac {
      display: inline-flex;
      flex-direction: column;
      vertical-align: middle;
      font-size: 0.72em;
      line-height: 1;
      text-align: center;
      margin: 0 1px;
    }
    .frac-top {
      border-bottom: 1.5px solid currentColor;
      padding: 0 1px 1px;
    }
    .frac-bottom {
      padding: 1px 1px 0;
    }

    .status-badge {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 7px;
      border-radius: 5px;
      white-space: nowrap;
    }
    .card-shrink .status-badge {
      background: #fef3c7;
      color: #d97706;
    }
    .card-same .status-badge {
      background: #e2e8f0;
      color: #475569;
    }
    .card-grow .status-badge {
      background: #dbeafe;
      color: #2563eb;
    }

    /* Visual Bar Comparison Area */
    .bar-visual {
      position: relative;
      height: 26px;
      background: rgba(0, 0, 0, 0.04);
      border-radius: 6px;
      display: flex;
      align-items: center;
      padding: 0 4px;
    }

    /* Benchmark line for starting size 4 */
    .ref-line {
      position: absolute;
      left: calc(4 / 5.2 * 100%);
      top: 0;
      bottom: 0;
      width: 2px;
      border-left: 2px dashed #94a3b8;
      z-index: 2;
    }
    .ref-label {
      position: absolute;
      left: calc(4 / 5.2 * 100%);
      top: -6px;
      transform: translateX(-50%);
      background: #ffffff;
      padding: 0 4px;
      font-size: 9px;
      font-weight: 700;
      color: #64748b;
      border-radius: 3px;
      border: 1px solid #cbd5e1;
      z-index: 3;
      white-space: nowrap;
    }

    .bar {
      height: 18px;
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: flex-end;
      padding-right: 6px;
      font-size: 11px;
      font-weight: 800;
      color: #ffffff;
      transition: width 0.35s ease;
      z-index: 1;
    }

    .bar-shrink {
      width: calc(3 / 5.2 * 100%);
      background: #d97706;
    }

    .bar-same {
      width: calc(4 / 5.2 * 100%);
      background: #64748b;
    }

    .bar-grow {
      width: calc(5 / 5.2 * 100%);
      background: #2563eb;
    }

    /* Scale axis markings */
    .scale-wrapper {
      padding: 0 16px;
      width: 100%;
    }
    .scale-ticks {
      position: relative;
      height: 14px;
      width: 100%;
      border-top: 1px solid #cbd5e1;
      padding-top: 2px;
    }
    .tick {
      position: absolute;
      transform: translateX(-50%);
      font-size: 10px;
      font-weight: 600;
      color: #64748b;
    }

    @media (max-width: 400px) {
      .card-head {
        gap: 4px;
      }
      .condition {
        font-size: 11px;
      }
      .equation {
        font-size: 13px;
      }
      .status-badge {
        font-size: 10px;
        padding: 1px 5px;
      }
      .rule-card {
        padding: 8px 10px;
      }
    }
  </style>
</head>
<body>

  <div class="cards-container">
    
    <div class="rule-card card-shrink active" onclick="selectCard(this)">
      <div class="card-head">
        <span class="condition">Fraction &lt; 1</span>
        <span class="equation">4 &times; <span class="frac"><span class="frac-top">3</span><span class="frac-bottom">4</span></span> = 3</span>
        <span class="status-badge">&darr; Product is Smaller (Shrinks)</span>
      </div>
      <div class="bar-visual">
        <div class="ref-line"></div>
        <div class="ref-label">Start (4)</div>
        <div class="bar bar-shrink">3</div>
      </div>
    </div>

    
    <div class="rule-card card-same active" onclick="selectCard(this)">
      <div class="card-head">
        <span class="condition">Fraction = 1</span>
        <span class="equation">4 &times; <span class="frac"><span class="frac-top">4</span><span class="frac-bottom">4</span></span> = 4</span>
        <span class="status-badge">= Product is Equal (Same)</span>
      </div>
      <div class="bar-visual">
        <div class="ref-line"></div>
        <div class="ref-label">Start (4)</div>
        <div class="bar bar-same">4</div>
      </div>
    </div>

    
    <div class="rule-card card-grow active" onclick="selectCard(this)">
      <div class="card-head">
        <span class="condition">Fraction &gt; 1</span>
        <span class="equation">4 &times; <span class="frac"><span class="frac-top">5</span><span class="frac-bottom">4</span></span> = 5</span>
        <span class="status-badge">&uarr; Product is Larger (Grows)</span>
      </div>
      <div class="bar-visual">
        <div class="ref-line"></div>
        <div class="ref-label">Start (4)</div>
        <div class="bar bar-grow">5</div>
      </div>
    </div>
  </div>

  <div class="scale-wrapper">
    <div class="scale-ticks">
      <span class="tick" style="left: 0%;">0</span>
      <span class="tick" style="left: calc(1 / 5.2 * 100%);">1</span>
      <span class="tick" style="left: calc(2 / 5.2 * 100%);">2</span>
      <span class="tick" style="left: calc(3 / 5.2 * 100%);">3</span>
      <span class="tick" style="left: calc(4 / 5.2 * 100%);">4</span>
      <span class="tick" style="left: calc(5 / 5.2 * 100%);">5</span>
    </div>
  </div>

  <script>
    function selectCard(card) {
      document.querySelectorAll('.rule-card').forEach(c => c.classList.remove('active'));
      card.classList.add('active');
    }
  </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>Area Model: 3 × 2/5</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      background: #f8fafc;
      color: #1e293b;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      padding: 16px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      width: 100%;
    }

    .main-container {
      width: 100%;
      max-width: 520px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 18px;
    }

    .toolbar {
      display: flex;
      gap: 10px;
    }

    .btn {
      background: #ffffff;
      border: 1.5px solid #cbd5e1;
      border-radius: 8px;
      padding: 7px 18px;
      font-size: 14px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    }

    .btn:hover {
      border-color: #94a3b8;
      color: #1e293b;
    }

    .btn.active {
      background: #2563eb;
      border-color: #2563eb;
      color: #ffffff;
    }

    .model-area {
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 18px;
    }

    .squares-row {
      display: flex;
      justify-content: center;
      gap: 14px;
      width: 100%;
    }

    .unit-wrap {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      flex: 1;
      max-width: 130px;
      transition: opacity 0.3s ease;
    }

    .unit-square {
      width: 100%;
      aspect-ratio: 1 / 1;
      border: 2px solid #334155;
      border-radius: 4px;
      display: flex;
      overflow: hidden;
      background: #ffffff;
    }

    .strip {
      flex: 1;
      height: 100%;
      border-right: 1px dashed #cbd5e1;
      background-color: #ffffff;
      transition: background-color 0.35s ease;
    }
    .strip:last-child {
      border-right: none;
    }

    .strip.shaded {
      background-color: #2563eb;
    }

    .unit-label {
      font-size: 14px;
      font-weight: 600;
      color: #475569;
      min-height: 20px;
      text-align: center;
    }

    .math-pill {
      font-size: 19px;
      font-weight: 700;
      color: #1e293b;
      background: #e2e8f0;
      padding: 8px 22px;
      border-radius: 9999px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .frac {
      display: inline-flex;
      flex-direction: column;
      vertical-align: middle;
      text-align: center;
      font-size: 16px;
      line-height: 1;
    }
    .frac .top {
      border-bottom: 1.5px solid currentColor;
      padding-bottom: 1px;
    }
    .frac .bottom {
      padding-top: 2px;
    }

    .blue {
      color: #2563eb;
    }

    @media (max-width: 400px) {
      body {
        padding: 10px 8px;
      }
      .squares-row {
        gap: 8px;
      }
      .unit-label {
        font-size: 12px;
      }
      .math-pill {
        font-size: 16px;
        padding: 6px 16px;
      }
      .frac {
        font-size: 14px;
      }
    }
  </style>
</head>
<body>

  <div class="main-container">
    <div class="toolbar">
      <button class="btn active" id="btnSeparate" onclick="setState('separate')">3 × (2/5)</button>
      <button class="btn" id="btnCombined" onclick="setState('combined')">Rearrange &amp; Combine</button>
    </div>

    <div class="model-area">
      <div class="squares-row">
        
        <div class="unit-wrap" id="wrap1">
          <div class="unit-square" id="sq1">
            <div class="strip shaded" id="s1_1"></div>
            <div class="strip shaded" id="s1_2"></div>
            <div class="strip" id="s1_3"></div>
            <div class="strip" id="s1_4"></div>
            <div class="strip" id="s1_5"></div>
          </div>
          <div class="unit-label" id="lbl1">2/5</div>
        </div>

        
        <div class="unit-wrap" id="wrap2">
          <div class="unit-square" id="sq2">
            <div class="strip shaded" id="s2_1"></div>
            <div class="strip shaded" id="s2_2"></div>
            <div class="strip" id="s2_3"></div>
            <div class="strip" id="s2_4"></div>
            <div class="strip" id="s2_5"></div>
          </div>
          <div class="unit-label" id="lbl2">2/5</div>
        </div>

        
        <div class="unit-wrap" id="wrap3">
          <div class="unit-square" id="sq3">
            <div class="strip shaded" id="s3_1"></div>
            <div class="strip shaded" id="s3_2"></div>
            <div class="strip" id="s3_3"></div>
            <div class="strip" id="s3_4"></div>
            <div class="strip" id="s3_5"></div>
          </div>
          <div class="unit-label" id="lbl3">2/5</div>
        </div>
      </div>

      <div class="math-pill" id="equation">
        3 × <span class="frac"><span class="top">2</span><span class="bottom">5</span></span> = <span class="blue"><span class="frac"><span class="top">6</span><span class="bottom">5</span></span></span>
      </div>
    </div>
  </div>

  <script>
    function setState(mode) {
      const btnSep = document.getElementById('btnSeparate');
      const btnComb = document.getElementById('btnCombined');
      const eq = document.getElementById('equation');
      
      const sq1Strips = ['s1_1', 's1_2', 's1_3', 's1_4', 's1_5'].map(id => document.getElementById(id));
      const sq2Strips = ['s2_1', 's2_2', 's2_3', 's2_4', 's2_5'].map(id => document.getElementById(id));
      const sq3Strips = ['s3_1', 's3_2', 's3_3', 's3_4', 's3_5'].map(id => document.getElementById(id));

      const lbl1 = document.getElementById('lbl1');
      const lbl2 = document.getElementById('lbl2');
      const lbl3 = document.getElementById('lbl3');
      const wrap3 = document.getElementById('wrap3');

      if (mode === 'separate') {
        btnSep.classList.add('active');
        btnComb.classList.remove('active');

        // Square 1: 2/5
        sq1Strips[0].className = 'strip shaded';
        sq1Strips[1].className = 'strip shaded';
        sq1Strips[2].className = 'strip';
        sq1Strips[3].className = 'strip';
        sq1Strips[4].className = 'strip';

        // Square 2: 2/5
        sq2Strips[0].className = 'strip shaded';
        sq2Strips[1].className = 'strip shaded';
        sq2Strips[2].className = 'strip';
        sq2Strips[3].className = 'strip';
        sq2Strips[4].className = 'strip';

        // Square 3: 2/5
        sq3Strips[0].className = 'strip shaded';
        sq3Strips[1].className = 'strip shaded';
        sq3Strips[2].className = 'strip';
        sq3Strips[3].className = 'strip';
        sq3Strips[4].className = 'strip';

        lbl1.textContent = '2/5';
        lbl2.textContent = '2/5';
        lbl3.textContent = '2/5';
        wrap3.style.opacity = '1';

        eq.innerHTML = '3 × <span class="frac"><span class="top">2</span><span class="bottom">5</span></span> = <span class="blue"><span class="frac"><span class="top">6</span><span class="bottom">5</span></span></span>';
      } else {
        btnComb.classList.add('active');
        btnSep.classList.remove('active');

        // Square 1: 5/5 full (1 whole)
        sq1Strips.forEach(s => s.className = 'strip shaded');

        // Square 2: 1/5 shaded
        sq2Strips[0].className = 'strip shaded';
        sq2Strips[1].className = 'strip';
        sq2Strips[2].className = 'strip';
        sq2Strips[3].className = 'strip';
        sq2Strips[4].className = 'strip';

        // Square 3: 0/5 (empty)
        sq3Strips.forEach(s => s.className = 'strip');

        lbl1.textContent = '1 Whole (5/5)';
        lbl2.textContent = '1/5';
        lbl3.textContent = '0/5';
        wrap3.style.opacity = '0.35';

        eq.innerHTML = 'Total = <span class="blue"><span class="frac"><span class="top">6</span><span class="bottom">5</span></span></span> = <span class="blue">1 <span class="frac"><span class="top">1</span><span class="bottom">5</span></span></span>';
      }
    }
  </script>
</body>
</html>

111.26(b)(3)(B)

Aligned learning resources

Related diagrams