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

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

    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
      max-width: 600px;
    }

    .panel {
      background: #ffffff;
      border-radius: 12px;
      padding: 14px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      position: relative;
    }

    .panel.valid {
      border: 2px solid #22c55e;
      background: #f0fdf4;
    }

    .panel.caution {
      border: 2px solid #ef4444;
      background: #fef2f2;
    }

    .badge {
      font-size: 13px;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 12px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      margin-bottom: 8px;
    }

    .badge.valid {
      background: #dcfce7;
      color: #15803d;
    }

    .badge.caution {
      background: #fee2e2;
      color: #b91c1c;
    }

    .amount {
      font-size: 32px;
      font-weight: 800;
      letter-spacing: 1px;
      margin-bottom: 10px;
      display: flex;
      align-items: baseline;
      justify-content: center;
    }

    .digit-hl {
      background: rgba(0, 0, 0, 0.08);
      border-radius: 4px;
      padding: 0 2px;
      text-decoration: underline;
      text-underline-offset: 3px;
    }

    .coins-area {
      min-height: 52px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      flex-wrap: wrap;
      margin-bottom: 10px;
    }

    .coin {
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #475569;
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8), 0 2px 4px rgba(0, 0, 0, 0.12);
      border: 1.5px solid #94a3b8;
    }

    .nickel {
      width: 48px;
      height: 48px;
      font-size: 15px;
      background: radial-gradient(circle at 35% 35%, #f1f5f9, #cbd5e1);
    }

    .dime {
      width: 32px;
      height: 32px;
      font-size: 11px;
      background: radial-gradient(circle at 35% 35%, #f8fafc, #cbd5e1);
    }

    .label {
      font-size: 14px;
      font-weight: 600;
      line-height: 1.3;
    }

    .footer-note {
      margin-top: 12px;
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
      text-align: center;
    }

    @media (max-width: 420px) {
      .amount { font-size: 26px; }
      .label { font-size: 12px; }
      .nickel { width: 42px; height: 42px; font-size: 13px; }
      .dime { width: 28px; height: 28px; font-size: 10px; }
    }
  </style>
</head>
<body>

  <div class="grid">
    
    <div class="panel valid">
      <span class="badge valid">✓ Correct</span>
      <div class="amount">
        $0.<span class="digit-hl">0</span>5
      </div>
      <div class="coins-area">
        <div class="coin nickel">5¢</div>
      </div>
      <div class="label">
        5 Cents<br>
        <span style="font-weight:400; color:#475569;">0 in tenths place</span>
      </div>
    </div>

    
    <div class="panel caution">
      <span class="badge caution">⚠ Different</span>
      <div class="amount">
        $0.<span class="digit-hl">5</span>0
      </div>
      <div class="coins-area">
        <div class="coin dime">10¢</div>
        <div class="coin dime">10¢</div>
        <div class="coin dime">10¢</div>
        <div class="coin dime">10¢</div>
        <div class="coin dime">10¢</div>
      </div>
      <div class="label">
        50 Cents<br>
        <span style="font-weight:400; color:#475569;">5 in tenths place</span>
      </div>
    </div>
  </div>

  <div class="footer-note">
    ✦ Always use 2 digits for cents!
  </div>

</body>
</html>

Representing Money Amounts in Dollars and Cents

<!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, sans-serif;
      color: #1e2945;
      background: transparent;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .step-card {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 14px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
      transition: all 0.3s ease;
    }

    .step-card.active {
      border-color: #22b7ff;
      box-shadow: 0 0 0 3px rgba(34, 183, 255, 0.2);
    }

    .step-num {
      background: #f1f5f9;
      color: #64748b;
      font-size: 12px;
      font-weight: 700;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    .active .step-num {
      background: #22b7ff;
      color: #ffffff;
    }

    .group {
      display: flex;
      align-items: center;
      gap: 6px;
      flex-wrap: wrap;
    }

    /* Bills */
    .bill {
      background: #e8f5e9;
      border: 1.5px solid #2e7d32;
      color: #1b5e20;
      font-weight: 800;
      font-size: 13px;
      padding: 4px 8px;
      border-radius: 4px;
      box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    }

    /* Coins */
    .coin {
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      box-shadow: inset 0 -1px 2px rgba(0,0,0,0.2), 0 1px 2px rgba(0,0,0,0.1);
      flex-shrink: 0;
    }
    .quarter {
      width: 32px;
      height: 32px;
      background: #e2e8f0;
      border: 1.5px solid #94a3b8;
      color: #334155;
      font-size: 11px;
    }
    .dime {
      width: 26px;
      height: 26px;
      background: #e2e8f0;
      border: 1.5px solid #94a3b8;
      color: #334155;
      font-size: 10px;
    }
    .penny {
      width: 24px;
      height: 24px;
      background: #ffedd5;
      border: 1.5px solid #c2410c;
      color: #9a3412;
      font-size: 10px;
    }

    .arrow {
      color: #94a3b8;
      font-weight: bold;
      font-size: 14px;
    }

    .subtotal {
      font-weight: 800;
      font-size: 15px;
      white-space: nowrap;
      padding: 4px 8px;
      border-radius: 6px;
    }
    .subtotal.dollars {
      background: #e8f5e9;
      color: #1b5e20;
    }
    .subtotal.cents {
      background: #ffedd5;
      color: #9a3412;
    }

    /* Final notation box */
    .final-box {
      background: #f8fafc;
      border: 2px solid #22b7ff;
      border-radius: 12px;
      padding: 10px 16px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 4px 12px rgba(34, 183, 255, 0.15);
    }

    .total-display {
      display: flex;
      align-items: baseline;
      gap: 1px;
      font-weight: 900;
      font-size: 32px;
      letter-spacing: -0.5px;
    }
    .tot-dollar { color: #1b5e20; }
    .tot-dot {
      color: #22b7ff;
      font-size: 36px;
      line-height: 0;
      margin: 0 1px;
    }
    .tot-cents { color: #c2410c; }

    .nav-bar {
      display: flex;
      justify-content: center;
      gap: 6px;
      margin-top: 2px;
    }
    .step-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      color: #475569;
      font-size: 12px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 14px;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .step-btn.active {
      background: #22b7ff;
      border-color: #22b7ff;
      color: #ffffff;
    }
  </style>
</head>
<body>

  
  <div class="step-card" id="card1">
    <div class="step-num">1</div>
    <div class="group">
      <div class="bill">$5</div>
      <div class="bill">$1</div>
      <div class="bill">$1</div>
    </div>
    <div class="arrow">→</div>
    <div class="subtotal dollars">$7</div>
  </div>

  
  <div class="step-card" id="card2">
    <div class="step-num">2</div>
    <div class="group">
      <div class="coin quarter">25¢</div>
      <div class="coin dime">10¢</div>
      <div class="coin penny">1¢</div>
      <div class="coin penny">1¢</div>
      <div class="coin penny">1¢</div>
    </div>
    <div class="arrow">→</div>
    <div class="subtotal cents">38¢</div>
  </div>

  
  <div class="final-box" id="card3">
    <div class="step-num">3</div>
    <div class="group" style="font-size: 13px; font-weight: 700; color: #64748b;">
      <span style="color: #1b5e20;">$7</span>
      <span>+</span>
      <span style="color: #c2410c;">38¢</span>
    </div>
    <div class="arrow">→</div>
    <div class="total-display">
      <span class="tot-dollar">$7</span>
      <span class="tot-dot">.</span>
      <span class="tot-cents">38</span>
    </div>
  </div>

  
  <div class="nav-bar">
    <button class="step-btn" onclick="setStep(0)">Step 1</button>
    <button class="step-btn" onclick="setStep(1)">Step 2</button>
    <button class="step-btn" onclick="setStep(2)">Step 3</button>
    <button class="step-btn active" onclick="setStep(3)">All</button>
  </div>

  <script>
    const cards = [
      document.getElementById('card1'),
      document.getElementById('card2'),
      document.getElementById('card3')
    ];
    const btns = document.querySelectorAll('.step-btn');

    function setStep(idx) {
      btns.forEach((b, i) => b.classList.toggle('active', i === idx));
      cards.forEach((c, i) => {
        if (idx === 3) {
          c.classList.add('active');
          c.style.opacity = '1';
        } else {
          c.classList.toggle('active', i === idx);
          c.style.opacity = i === idx ? '1' : '0.45';
        }
      });
    }

    setStep(3);
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: #f8fafc;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px 8px;
      min-height: 100%;
    }

    /* Main comparison container */
    .compare-stage {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      width: 100%;
      max-width: 580px;
    }

    /* Equal sign */
    .eq-sign {
      font-size: 28px;
      font-weight: 800;
      color: #0284c7;
      user-select: none;
      flex-shrink: 0;
    }

    /* Cards */
    .money-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 8px;
      box-shadow: 0 4px 12px rgba(30, 41, 69, 0.05);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      flex: 1;
      min-height: 220px;
    }

    /* $1 Bill */
    .bill {
      width: 140px;
      height: 74px;
      background: #ecfdf5;
      border: 2px solid #059669;
      border-radius: 6px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 2px 6px rgba(5, 150, 105, 0.15);
      margin-bottom: 12px;
    }
    .bill-inner {
      width: 128px;
      height: 62px;
      border: 1px dashed #10b981;
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }
    .bill-corner {
      position: absolute;
      font-size: 9px;
      font-weight: 800;
      color: #047857;
      line-height: 1;
    }
    .tl { top: 3px; left: 4px; }
    .tr { top: 3px; right: 4px; }
    .bl { bottom: 3px; left: 4px; }
    .br { bottom: 3px; right: 4px; }
    .bill-center {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      border: 1.5px solid #059669;
      background: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      font-weight: 800;
      color: #047857;
    }

    /* Coins View Holder */
    .coin-display {
      width: 100%;
      height: 140px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .coin-panel {
      display: none;
      width: 100%;
      height: 100%;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }
    .coin-panel.active {
      display: flex;
    }

    /* 10x10 Penny Grid */
    .penny-grid {
      display: grid;
      grid-template-columns: repeat(10, 1fr);
      gap: 2.5px;
      padding: 4px;
      background: #fff7ed;
      border: 1px solid #fed7aa;
      border-radius: 8px;
    }
    .penny {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: radial-gradient(circle at 35% 35%, #fb923c, #c2410c);
      box-shadow: 0 1px 1px rgba(194, 65, 12, 0.3);
    }

    /* Dimes Grid */
    .dime-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 6px;
    }
    .dime {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: radial-gradient(circle at 35% 35%, #ffffff, #94a3b8);
      border: 1.5px solid #64748b;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 8px;
      font-weight: 800;
      color: #334155;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    }

    /* Quarters Grid */
    .quarter-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 10px;
    }
    .quarter {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: radial-gradient(circle at 35% 35%, #ffffff, #cbd5e1);
      border: 2px solid #64748b;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 11px;
      font-weight: 800;
      color: #1e2945;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.12);
    }

    /* Card Labels */
    .card-label {
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
      text-align: center;
      margin-top: 4px;
    }
    .sub-label {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
    }

    /* Switcher Controls */
    .nav-tabs {
      display: flex;
      gap: 6px;
      margin-top: 14px;
      background: #e2e8f0;
      padding: 3px;
      border-radius: 20px;
    }
    .tab-btn {
      border: none;
      background: transparent;
      padding: 6px 12px;
      border-radius: 16px;
      font-size: 12px;
      font-weight: 700;
      color: #475569;
      cursor: pointer;
      transition: all 0.2s ease;
      white-space: nowrap;
    }
    .tab-btn.active {
      background: #ffffff;
      color: #0284c7;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    }
  </style>
</head>
<body>

  <div class="compare-stage">
    
    <div class="money-card">
      <div class="bill">
        <div class="bill-inner">
          <span class="bill-corner tl">$1</span>
          <span class="bill-corner tr">$1</span>
          <span class="bill-corner bl">$1</span>
          <span class="bill-corner br">$1</span>
          <div class="bill-center">$1</div>
        </div>
      </div>
      <div class="card-label">1 Whole Dollar</div>
      <div class="sub-label">($1.00)</div>
    </div>

    
    <div class="eq-sign">=</div>

    
    <div class="money-card">
      <div class="coin-display">
        
        <div class="coin-panel active" id="view-pennies">
          <div class="penny-grid" id="pennyGrid"></div>
        </div>

        
        <div class="coin-panel" id="view-dimes">
          <div class="dime-grid">
            <div class="dime">10¢</div><div class="dime">10¢</div><div class="dime">10¢</div><div class="dime">10¢</div><div class="dime">10¢</div>
            <div class="dime">10¢</div><div class="dime">10¢</div><div class="dime">10¢</div><div class="dime">10¢</div><div class="dime">10¢</div>
          </div>
        </div>

        
        <div class="coin-panel" id="view-quarters">
          <div class="quarter-grid">
            <div class="quarter">25¢</div><div class="quarter">25¢</div>
            <div class="quarter">25¢</div><div class="quarter">25¢</div>
          </div>
        </div>
      </div>

      <div class="card-label" id="coinLabel">100 Cents</div>
      <div class="sub-label" id="coinSubLabel">(100¢)</div>
    </div>
  </div>

  
  <div class="nav-tabs">
    <button class="tab-btn active" onclick="setCoinView(0)">100 Pennies</button>
    <button class="tab-btn" onclick="setCoinView(1)">10 Dimes</button>
    <button class="tab-btn" onclick="setCoinView(2)">4 Quarters</button>
  </div>

  <script>
    // Generate 100 pennies for the 10x10 grid
    const pennyGrid = document.getElementById('pennyGrid');
    for (let i = 0; i < 100; i++) {
      const p = document.createElement('div');
      p.className = 'penny';
      pennyGrid.appendChild(p);
    }

    const views = [
      { id: 'view-pennies', label: '100 Cents', sub: '(100¢)' },
      { id: 'view-dimes', label: '10 Dimes', sub: '(= 100¢)' },
      { id: 'view-quarters', label: '4 Quarters', sub: '(= 100¢)' }
    ];

    const tabBtns = document.querySelectorAll('.tab-btn');
    const panels = document.querySelectorAll('.coin-panel');
    const coinLabel = document.getElementById('coinLabel');
    const coinSubLabel = document.getElementById('coinSubLabel');

    let currentIdx = 0;
    let autoTimer = null;

    function setCoinView(idx, userAction = true) {
      if (userAction && autoTimer) {
        clearInterval(autoTimer);
        autoTimer = null;
      }
      currentIdx = idx;
      tabBtns.forEach((btn, i) => btn.classList.toggle('active', i === idx));
      panels.forEach((panel, i) => panel.classList.toggle('active', i === idx));
      coinLabel.textContent = views[idx].label;
      coinSubLabel.textContent = views[idx].sub;
    }

    // Auto-cycle gently to show equivalences if user doesn't interact
    autoTimer = setInterval(() => {
      currentIdx = (currentIdx + 1) % views.length;
      setCoinView(currentIdx, false);
    }, 3200);
  </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;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      user-select: none;
    }

    .main-stage {
      width: 100%;
      max-width: 540px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
    }

    /* Callout & Digits Grid */
    .anatomy-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 4px;
      width: 100%;
      align-items: end;
    }

    .anatomy-col {
      display: flex;
      flex-direction: column;
      align-items: center;
      cursor: pointer;
      border-radius: 8px;
      padding: 6px 2px;
      transition: background 0.2s ease;
    }

    .anatomy-col:hover, .anatomy-col.active {
      background: #f8fafc;
    }

    .badge {
      font-size: 11px;
      font-weight: 700;
      text-align: center;
      line-height: 1.2;
      padding: 4px 6px;
      border-radius: 6px;
      color: #ffffff;
      width: 100%;
      min-height: 42px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      box-shadow: 0 1px 3px rgba(0,0,0,0.1);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .sub-tag {
      font-size: 9.5px;
      font-weight: 500;
      opacity: 0.92;
      margin-top: 2px;
    }

    .arrow {
      width: 0;
      height: 0;
      border-left: 5px solid transparent;
      border-right: 5px solid transparent;
      margin-bottom: 6px;
      margin-top: 1px;
    }

    .char {
      font-size: 40px;
      font-weight: 800;
      line-height: 1;
      padding: 4px 0;
      font-variant-numeric: tabular-nums;
      transition: transform 0.2s ease, color 0.2s ease;
    }

    .anatomy-col.active .char {
      transform: translateY(-2px);
    }

    /* Colors per section */
    .c-dollar .badge { background: #059669; }
    .c-dollar .arrow { border-top: 6px solid #059669; }
    .c-dollar .char { color: #059669; }

    .c-ones .badge { background: #2563eb; }
    .c-ones .arrow { border-top: 6px solid #2563eb; }
    .c-ones .char { color: #2563eb; }

    .c-dot .badge { background: #d97706; }
    .c-dot .arrow { border-top: 6px solid #d97706; }
    .c-dot .char { color: #d97706; }

    .c-tenths .badge { background: #7c3aed; }
    .c-tenths .arrow { border-top: 6px solid #7c3aed; }
    .c-tenths .char { color: #7c3aed; }

    .c-hund .badge { background: #db2777; }
    .c-hund .arrow { border-top: 6px solid #db2777; }
    .c-hund .char { color: #db2777; }

    /* Cent breakdown progress card */
    .cents-visual {
      width: 100%;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 14px;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .cents-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
    }

    .fraction-badge {
      background: #ede9fe;
      color: #6d28d9;
      font-size: 12px;
      padding: 2px 8px;
      border-radius: 999px;
      font-weight: 700;
    }

    .meter-track {
      width: 100%;
      height: 18px;
      background: #e2e8f0;
      border-radius: 9px;
      overflow: hidden;
      display: flex;
      position: relative;
    }

    .meter-fill-dimes {
      width: 70%;
      height: 100%;
      background: #7c3aed;
      transition: width 0.3s ease;
    }

    .meter-fill-pennies {
      width: 5%;
      height: 100%;
      background: #db2777;
      transition: width 0.3s ease;
    }

    .meter-remaining {
      width: 25%;
      height: 100%;
      background: transparent;
    }

    .meter-labels {
      display: flex;
      justify-content: space-between;
      font-size: 11px;
      color: #64748b;
      font-weight: 600;
    }

    /* Explanation message pill */
    .info-bar {
      font-size: 12.5px;
      font-weight: 600;
      color: #1e2945;
      text-align: center;
      min-height: 20px;
    }

    /* Interactive Stepper Navigation */
    .nav-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin-top: 4px;
    }

    .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #cbd5e1;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .dot.active {
      background: #2563eb;
      transform: scale(1.3);
    }

    @media (max-width: 400px) {
      .badge {
        font-size: 9.5px;
        padding: 3px 2px;
        min-height: 38px;
      }
      .sub-tag {
        font-size: 8.5px;
      }
      .char {
        font-size: 32px;
      }
      .cents-header {
        font-size: 12px;
      }
      .fraction-badge {
        font-size: 11px;
      }
    }
  </style>
</head>
<body>

  <div class="main-stage">
    
    <div class="anatomy-grid" id="anatomyGrid">
      
      
      <div class="anatomy-col c-dollar" onclick="selectStep(0)">
        <div class="badge">
          Dollar Sign
          <span class="sub-tag">First</span>
        </div>
        <div class="arrow"></div>
        <div class="char">$</div>
      </div>

      
      <div class="anatomy-col c-ones" onclick="selectStep(1)">
        <div class="badge">
          Dollars
          <span class="sub-tag">4 Whole</span>
        </div>
        <div class="arrow"></div>
        <div class="char">4</div>
      </div>

      
      <div class="anatomy-col c-dot" onclick="selectStep(2)">
        <div class="badge">
          Decimal
          <span class="sub-tag">Dot</span>
        </div>
        <div class="arrow"></div>
        <div class="char">.</div>
      </div>

      
      <div class="anatomy-col c-tenths" onclick="selectStep(3)">
        <div class="badge">
          Dimes
          <span class="sub-tag">70¢ (Tenths)</span>
        </div>
        <div class="arrow"></div>
        <div class="char">7</div>
      </div>

      
      <div class="anatomy-col c-hund" onclick="selectStep(4)">
        <div class="badge">
          Pennies
          <span class="sub-tag">5¢ (Hundredths)</span>
        </div>
        <div class="arrow"></div>
        <div class="char">5</div>
      </div>

    </div>

    
    <div class="info-bar" id="infoBar">
      Tap any part to explore its role
    </div>

    
    <div class="cents-visual">
      <div class="cents-header">
        <span>Part of Next Dollar: 75¢</span>
        <span class="fraction-badge">75 / 100¢</span>
      </div>
      <div class="meter-track" title="75 out of 100 cents">
        <div class="meter-fill-dimes"></div>
        <div class="meter-fill-pennies"></div>
        <div class="meter-remaining"></div>
      </div>
      <div class="meter-labels">
        <span>$4.00</span>
        <span>70¢ + 5¢ = 75¢</span>
        <span>$5.00</span>
      </div>
    </div>

    
    <div class="nav-row" id="dotNav">
      <div class="dot" onclick="selectStep(0)"></div>
      <div class="dot" onclick="selectStep(1)"></div>
      <div class="dot" onclick="selectStep(2)"></div>
      <div class="dot" onclick="selectStep(3)"></div>
      <div class="dot" onclick="selectStep(4)"></div>
    </div>
  </div>

  <script>
    const descriptions = [
      "Dollar Sign ($): Written first before the amount",
      "Whole Dollars (4): Complete one-dollar units",
      "Decimal Point (.): Separates whole dollars and cents",
      "Tenths Place (7): 7 dimes = 70 cents",
      "Hundredths Place (5): 5 pennies = 5 cents"
    ];

    let currentStep = -1;

    function selectStep(idx) {
      currentStep = idx;
      const cols = document.querySelectorAll('.anatomy-col');
      const dots = document.querySelectorAll('.dot');
      const infoBar = document.getElementById('infoBar');

      cols.forEach((col, i) => {
        if (i === idx) {
          col.classList.add('active');
        } else {
          col.classList.remove('active');
        }
      });

      dots.forEach((dot, i) => {
        if (i === idx) {
          dot.classList.add('active');
        } else {
          dot.classList.remove('active');
        }
      });

      infoBar.textContent = descriptions[idx];
    }
  </script>
</body>
</html>

Making Equivalent Combinations of Coins and Bills

Calculating Change from Ten, Twenty, and Fifty Dollar Bills

Solving Multi-Step Money Word Problems with All Four Operations

Solving Money Problems with Discounts, Sales Tax, and Change

math

Money Values, Making Change, and Multi-Step Transactions

Coin Values: Penny, Nickel, Dime, and Quarter

Counting Pennies, Nickels, and Dimes

Counting Quarters by 25s

Counting Mixed Coins

Dollar Bills: $1, $5, $10, and $20

Counting Coins and Bills Together

Finding the Total Value of a Money Collection

Making One Dollar with Coin Combinations

Counting Coins and Bills

Adding Money Amounts

Subtracting Money Amounts

Comparing Money Amounts

Making Change from a Purchase

Money Word Problems

Money in Real-World Situations

Estimating Money Amounts

Counting Collections with Multiple Bills

Making Change from Bills

Estimating Costs at the Store

Money Operations and Real-World Problems

Adding Within 1,000 Using Place Value Strategies

Subtracting Within 1,000 Using Place Value Strategies

Two-Step Addition and Subtraction Word Problems

Strip Diagrams for Two-Step Addition and Subtraction Problems

Counting Coins and Bills to Find Total Value

Solving Money Word Problems with Bills

Making Change and Comparing Money Amounts

Addition, Subtraction, and Money Within 1,000

Converting Between Pounds and Pence

Adding Amounts of Money Using Pounds and Pence

Adding Money with Regrouping from Pence to Pounds

Subtracting Amounts of Money Without Exchange

Subtracting Amounts of Money with Exchange

Calculating Change from One Pound and Two Pounds

Calculating Change from £5, £10, and £20 Notes

Solving Multi-Step Shopping and Budgeting Word Problems

Money Investigations and Real-Life Problem Solving

Money: Pounds, Pence, and Giving Change

Representing Problems with Number Sentences

Solving Money Problems with Addition and Subtraction

Solving Money Problems with Multiplication and Division

Solving Real Number Problems Using Digital Tools

Modelling Additive Situations

Modelling Multiplicative Situations

Foundations of Mathematical Modelling

Obliczenia pieniężne – złote i grosze

Zamiana złotych na grosze i odwrotnie

Nominały monet i banknotów

Siła nabywcza – porównywanie cen

Wydatki i reszta – obliczenia

Szacowanie kosztów zakupów

Dzielenie na połowy i ćwiartki w praktyce

Pieniądze w życiu codziennym

Choosing Calculation Strategies for Problems

Interpreting Solutions in Context

Communicating Solutions in Terms of the Situation

Modelling Shopping Problems

Modelling Sharing Problems

Modelling Measurement Problems

Strategies and Contexts for Problem Solving

Writing Number Sentences for Word Problems

Representing Problems with Diagrams

Multi-Step Modelling Problems

Using Digital Tools for Modelling

Formulating Problems from Stories

Checking Solutions Against the Context

Advanced Modelling and Problem Formulation

Ułamki dziesiętne – wprowadzenie

Ułamki dziesiętne – setne części

Ułamki w kontekście – miary i pieniądze

Sprawdzenie – ułamki

Ułamki dziesiętne i zastosowania

Understanding Dollars and Cents

Representing Money Values in Different Ways

Counting Money in Dollars and Cents

Making Money Amounts with Coins and Notes

Converting Between Dollars and Cents

Understanding Australian Money

Calculating Change

Comparing Prices

Budgeting with Money

Representing Money Values Differently

Financial Problem Solving

Calculating Change and Financial Problem Solving

OGM.4.MD.3

OGM.4.MD.3

Aligned learning resources

Related diagrams