<!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%;
      min-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: 16px;
      gap: 16px;
      user-select: none;
    }

    /* Number Selector Buttons */
    .btn-group {
      display: flex;
      gap: 8px;
      justify-content: center;
      width: 100%;
      max-width: 440px;
    }

    .num-btn {
      flex: 1;
      min-width: 44px;
      height: 44px;
      font-size: 18px;
      font-weight: 700;
      border: 2px solid #e2e8f0;
      border-radius: 12px;
      background: #f8fafc;
      color: #475569;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
      box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
      -webkit-tap-highlight-color: transparent;
    }

    .num-btn:hover {
      background: #f1f5f9;
      border-color: #cbd5e1;
    }

    .num-btn.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
      box-shadow: 0 4px 10px rgba(2, 132, 199, 0.25);
    }

    /* Ten-Frame Grid */
    .ten-frame-container {
      width: 100%;
      max-width: 440px;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .ten-frame {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      grid-template-rows: repeat(2, 1fr);
      gap: 6px;
      background: #0f172a;
      padding: 8px;
      border-radius: 14px;
      box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
    }

    .cell {
      aspect-ratio: 1 / 1;
      background: #ffffff;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    /* Dots */
    .dot {
      width: 74%;
      height: 74%;
      border-radius: 50%;
      transition: opacity 0.25s ease, transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
      box-shadow: inset 0 -3px 6px rgba(0, 0, 0, 0.18), 0 2px 5px rgba(0, 0, 0, 0.15);
    }

    .dot.blue {
      background: #0ea5e9;
      opacity: 1;
      transform: scale(1);
    }

    .dot.orange {
      background: #f97316;
      opacity: 0;
      transform: scale(0.2);
    }

    .dot.orange.visible {
      opacity: 1;
      transform: scale(1);
      animation: gentlePulse 0.3s ease-out;
    }

    @keyframes gentlePulse {
      0% {
        transform: scale(0.2);
        opacity: 0;
      }
      70% {
        transform: scale(1.1);
        opacity: 1;
      }
      100% {
        transform: scale(1);
        opacity: 1;
      }
    }

    /* Equation Display */
    .equation-card {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 16px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      font-size: 18px;
      font-weight: 700;
      max-width: 440px;
      width: 100%;
    }

    .badge-blue {
      color: #0284c7;
      background: #e0f2fe;
      padding: 2px 8px;
      border-radius: 6px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .badge-orange {
      color: #ea580c;
      background: #ffedd5;
      padding: 2px 8px;
      border-radius: 6px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .badge-total {
      color: #0f172a;
      background: #e2e8f0;
      padding: 2px 10px;
      border-radius: 6px;
      font-size: 19px;
    }

    .operator {
      color: #94a3b8;
      font-weight: 600;
    }
  </style>
</head>
<body>

  
  <div class="btn-group" role="group" aria-label="Select total dots">
    <button class="num-btn" data-num="6">6</button>
    <button class="num-btn active" data-num="7">7</button>
    <button class="num-btn" data-num="8">8</button>
    <button class="num-btn" data-num="9">9</button>
    <button class="num-btn" data-num="10">10</button>
  </div>

  
  <div class="ten-frame-container">
    <div class="ten-frame" id="tenFrame">
      
      <div class="cell"><div class="dot blue"></div></div>
      <div class="cell"><div class="dot blue"></div></div>
      <div class="cell"><div class="dot blue"></div></div>
      <div class="cell"><div class="dot blue"></div></div>
      <div class="cell"><div class="dot blue"></div></div>

      
      <div class="cell"><div class="dot orange" id="d0"></div></div>
      <div class="cell"><div class="dot orange" id="d1"></div></div>
      <div class="cell"><div class="dot orange" id="d2"></div></div>
      <div class="cell"><div class="dot orange" id="d3"></div></div>
      <div class="cell"><div class="dot orange" id="d4"></div></div>
    </div>
  </div>

  
  <div class="equation-card">
    <span class="badge-blue">5 <span style="font-size: 13px; font-weight: 600;">top</span></span>
    <span class="operator">+</span>
    <span class="badge-orange"><span id="bottomCount">2</span> <span style="font-size: 13px; font-weight: 600;">bottom</span></span>
    <span class="operator">=</span>
    <span class="badge-total" id="totalCount">7 total</span>
  </div>

  <script>
    const buttons = document.querySelectorAll('.num-btn');
    const bottomDots = [
      document.getElementById('d0'),
      document.getElementById('d1'),
      document.getElementById('d2'),
      document.getElementById('d3'),
      document.getElementById('d4')
    ];
    const bottomCountEl = document.getElementById('bottomCount');
    const totalCountEl = document.getElementById('totalCount');

    function updateFrame(total) {
      const bottomCount = total - 5;

      // Update button highlights
      buttons.forEach(btn => {
        const num = parseInt(btn.dataset.num, 10);
        btn.classList.toggle('active', num === total);
      });

      // Update orange dots with sequential appearance
      bottomDots.forEach((dot, index) => {
        if (index < bottomCount) {
          if (!dot.classList.contains('visible')) {
            dot.classList.add('visible');
          }
        } else {
          dot.classList.remove('visible');
        }
      });

      // Update math sentence
      bottomCountEl.textContent = bottomCount;
      totalCountEl.textContent = `${total} total`;
    }

    buttons.forEach(btn => {
      btn.addEventListener('click', () => {
        const num = parseInt(btn.dataset.num, 10);
        updateFrame(num);
      });
    });

    // Initialize with 7
    updateFrame(7);
  </script>
</body>
</html>

Subitizing Small Quantities with Ten-Frames

<!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;
      -webkit-tap-highlight-color: transparent;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      padding: 12px;
      user-select: none;
    }
    .wrapper {
      width: 100%;
      max-width: 380px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
    }
    .badge-top {
      background: #e0f2fe;
      color: #0369a1;
      border: 2px solid #bae6fd;
      border-radius: 999px;
      padding: 6px 18px;
      font-size: 15px;
      font-weight: 800;
      letter-spacing: -0.2px;
      text-align: center;
    }
    .frame-wrapper {
      position: relative;
      width: 100%;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 4px 12px rgba(30, 41, 69, 0.08);
    }
    .frame-container {
      width: 100%;
      aspect-ratio: 5 / 2;
      background: #ffffff;
      border: 3px solid #1e2945;
      border-radius: 12px;
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      grid-template-rows: repeat(2, 1fr);
      overflow: hidden;
    }
    .cell {
      border-right: 2px solid #1e2945;
      border-bottom: 2px solid #1e2945;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }
    .cell:nth-child(5n) {
      border-right: none;
    }
    .cell:nth-child(n+6) {
      border-bottom: none;
    }
    .counter {
      width: 68%;
      aspect-ratio: 1;
      border-radius: 50%;
      background: radial-gradient(circle at 35% 35%, #38bdf8, #0284c7);
      box-shadow: inset 0 -3px 6px rgba(3, 105, 161, 0.4), 0 3px 6px rgba(2, 132, 199, 0.35);
      transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    }
    .numbers-row {
      width: 100%;
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 4px;
    }
    .num-pill {
      margin: 0 auto;
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: #ffffff;
      border: 2px solid #94a3b8;
      color: #64748b;
      font-weight: 800;
      font-size: 15px;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
    }
    .num-pill.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
      transform: translateY(-2px);
      box-shadow: 0 3px 8px rgba(2, 132, 199, 0.3);
    }
    .btn-flash {
      background: #1e2945;
      color: #ffffff;
      border: none;
      border-radius: 999px;
      padding: 10px 24px;
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 4px 10px rgba(30, 41, 69, 0.2);
      transition: opacity 0.15s ease, filter 0.15s ease;
    }
    .btn-flash:hover {
      filter: brightness(1.15);
    }
    .btn-flash:active {
      filter: brightness(0.9);
    }
    .flash-overlay {
      position: absolute;
      inset: 0;
      background: #1e2945;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #ffffff;
      font-size: 28px;
      font-weight: 800;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.1s ease;
      z-index: 10;
      border-radius: 10px;
    }
    .flash-overlay.visible {
      opacity: 1;
    }
  </style>
</head>
<body>

  <div class="wrapper">
    <div class="badge-top">Full Top Row = 5 Dots!</div>

    <div class="frame-wrapper">
      <div class="frame-container" id="tenFrame">
        
        <div class="cell"><div class="counter"></div></div>
        <div class="cell"><div class="counter"></div></div>
        <div class="cell"><div class="counter"></div></div>
        <div class="cell"><div class="counter"></div></div>
        <div class="cell"><div class="counter"></div></div>
        
        <div class="cell"></div>
        <div class="cell"></div>
        <div class="cell"></div>
        <div class="cell"></div>
        <div class="cell"></div>
      </div>
      <div class="flash-overlay" id="flashCover">👀</div>
    </div>

    <div class="numbers-row">
      <div class="num-pill active">1</div>
      <div class="num-pill active">2</div>
      <div class="num-pill active">3</div>
      <div class="num-pill active">4</div>
      <div class="num-pill active">5</div>
    </div>

    <button class="btn-flash" id="flashBtn">
      <span>⚡ Flash 5</span>
    </button>
  </div>

  <script>
    const flashBtn = document.getElementById('flashBtn');
    const flashCover = document.getElementById('flashCover');
    const pills = document.querySelectorAll('.num-pill');
    let isFlashing = false;

    function playPop(freq = 520) {
      try {
        const ctx = new (window.AudioContext || window.webkitAudioContext)();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        osc.type = 'sine';
        osc.frequency.setValueAtTime(freq, ctx.currentTime);
        gain.gain.setValueAtTime(0.2, ctx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.25);
        osc.connect(gain);
        gain.connect(ctx.destination);
        osc.start();
        osc.stop(ctx.currentTime + 0.25);
      } catch (e) {}
    }

    flashBtn.addEventListener('click', () => {
      if (isFlashing) return;
      isFlashing = true;
      flashBtn.style.opacity = '0.5';

      // 1. Cover frame
      flashCover.classList.add('visible');
      pills.forEach(p => p.classList.remove('active'));

      // 2. Quick flash reveal (blink of an eye: 650ms)
      setTimeout(() => {
        playPop(600);
        flashCover.classList.remove('visible');
      }, 500);

      // 3. Hide again briefly to test mental image
      setTimeout(() => {
        flashCover.classList.add('visible');
      }, 1200);

      // 4. Return to full proof state
      setTimeout(() => {
        playPop(750);
        flashCover.classList.remove('visible');
        pills.forEach(p => p.classList.add('active'));
        flashBtn.style.opacity = '1';
        isFlashing = false;
      }, 2000);
    });
  </script>
</body>
</html>

111.3(b)(2)(A)

Aligned learning resources

Related diagrams