<!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;
      user-select: none;
    }

    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;
    }

    .diagram-svg {
      width: 100%;
      max-width: 640px;
      height: auto;
      display: block;
      overflow: visible;
    }

    .tick-target {
      cursor: pointer;
    }

    .tick-label {
      font-size: 13px;
      font-weight: 600;
      fill: #1e2945;
      text-anchor: middle;
      font-family: inherit;
    }

    .tick-label-top {
      font-size: 15px;
      font-weight: 700;
      fill: #1e2945;
      text-anchor: middle;
    }

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

    .coral-text {
      fill: #ff5757;
      font-weight: 800;
    }

    .instruction {
      font-size: 13px;
      font-weight: 500;
      color: #64748b;
      margin-top: 4px;
      text-align: center;
    }

    .jump-arc {
      fill: none;
      stroke: #ff5757;
      stroke-width: 2;
      stroke-dasharray: 4 2;
    }
  </style>
</head>
<body>

  <svg class="diagram-svg" viewBox="0 0 640 430" aria-label="Magnifying zoom on a number line between 0.7 and 0.8">
    <defs>
      
      <linearGradient id="zoomGrad" x1="0" y1="0" x2="0" y2="1">
        <stop offset="0%" stop-color="#38bdf8" stop-opacity="0.3" />
        <stop offset="100%" stop-color="#38bdf8" stop-opacity="0.04" />
      </linearGradient>

      
      <filter id="shadow" x="-20%" y="-20%" width="140%" height="140%">
        <feDropShadow dx="0" dy="2" stdDeviation="3" flood-color="#1e2945" flood-opacity="0.15" />
      </filter>
    </defs>

    
    <polygon points="248,55 392,55 590,205 50,205" fill="url(#zoomGrad)" />
    <line x1="248" y1="55" x2="50" y2="205" stroke="#38bdf8" stroke-width="1.5" stroke-dasharray="4 3" />
    <line x1="392" y1="55" x2="590" y2="205" stroke="#38bdf8" stroke-width="1.5" stroke-dasharray="4 3" />

    
    
    <line x1="40" y1="55" x2="600" y2="55" stroke="#cbd5e1" stroke-width="4" stroke-linecap="round" />
    
    
    <line x1="248" y1="55" x2="392" y2="55" stroke="#0284c7" stroke-width="5" stroke-linecap="round" />

    
    
    <line x1="104" y1="45" x2="104" y2="65" stroke="#94a3b8" stroke-width="2.5" stroke-linecap="round" />
    <text x="104" y="34" class="tick-label-top">0.6</text>

    
    <line x1="248" y1="41" x2="248" y2="69" stroke="#0284c7" stroke-width="3.5" stroke-linecap="round" />
    <circle cx="248" cy="55" r="4" fill="#0284c7" />
    <text x="248" y="32" class="tick-label-top highlight-label">0.7</text>

    
    <line x1="392" y1="41" x2="392" y2="69" stroke="#0284c7" stroke-width="3.5" stroke-linecap="round" />
    <circle cx="392" cy="55" r="4" fill="#0284c7" />
    <text x="392" y="32" class="tick-label-top highlight-label">0.8</text>

    
    <line x1="536" y1="45" x2="536" y2="65" stroke="#94a3b8" stroke-width="2.5" stroke-linecap="round" />
    <text x="536" y="34" class="tick-label-top">0.9</text>

    
    <g transform="translate(320, 55)">
      <circle cx="0" cy="0" r="16" fill="#ffffff" stroke="#0284c7" stroke-width="2.5" filter="url(#shadow)" />
      
      <circle cx="-2" cy="-2" r="6" fill="none" stroke="#0284c7" stroke-width="2" />
      <line x1="2.5" y1="2.5" x2="7.5" y2="7.5" stroke="#0284c7" stroke-width="2.5" stroke-linecap="round" />
    </g>


    
    
    <line x1="35" y1="205" x2="605" y2="205" stroke="#1e2945" stroke-width="3" stroke-linecap="round" />

    
    <g id="ticksGroup"></g>

    
    <g id="hopArcsGroup"></g>

    
    <g id="coralMarker" filter="url(#shadow)" style="transition: transform 0.35s cubic-bezier(0.34, 1.3, 0.64, 1);">
      
      <rect x="-120" y="-86" width="240" height="42" rx="10" fill="#ff5757" />
      <polygon points="0,-36 -8,-44 8,-44" fill="#ff5757" />
      
      <text id="markerText" x="0" y="-60" fill="#ffffff" font-size="13.5" font-weight="700" text-anchor="middle" font-family="inherit">
        0.74 is 4 hundredths past 0.70
      </text>
      
      <circle cx="0" cy="0" r="6.5" fill="#ff5757" stroke="#ffffff" stroke-width="2" />
    </g>
  </svg>

  <div class="instruction">Tap any tick mark to explore hundredths</div>

  <script>
    const startX = 50;
    const endX = 590;
    const lineY = 205;
    const totalSteps = 10;
    const stepWidth = (endX - startX) / totalSteps;

    const ticksGroup = document.getElementById('ticksGroup');
    const hopArcsGroup = document.getElementById('hopArcsGroup');
    const coralMarker = document.getElementById('coralMarker');
    const markerText = document.getElementById('markerText');

    let currentVal = 4; // Default 0.74

    function renderDiagram() {
      ticksGroup.innerHTML = '';
      
      for (let i = 0; i <= totalSteps; i++) {
        const x = startX + i * stepWidth;
        const hundredth = (70 + i) / 100;
        const valStr = hundredth.toFixed(2);
        const isEnd = (i === 0 || i === 10);
        const isMid = (i === 5);
        const tickHeight = isEnd ? 24 : (isMid ? 18 : 12);

        // Clickable interactive hit box
        const hitG = document.createElementNS('http://www.w3.org/2000/svg', 'g');
        hitG.setAttribute('class', 'tick-target');
        hitG.onclick = () => selectTick(i);

        // Transparent hit rectangle
        const rect = document.createElementNS('http://www.w3.org/2000/svg', 'rect');
        rect.setAttribute('x', x - 24);
        rect.setAttribute('y', lineY - 20);
        rect.setAttribute('width', 48);
        rect.setAttribute('height', 85);
        rect.setAttribute('fill', 'transparent');

        // Tick line
        const tick = document.createElementNS('http://www.w3.org/2000/svg', 'line');
        tick.setAttribute('x1', x);
        tick.setAttribute('y1', lineY - (tickHeight / 2));
        tick.setAttribute('x2', x);
        tick.setAttribute('y2', lineY + (tickHeight / 2));
        tick.setAttribute('stroke', isEnd ? '#0284c7' : '#64748b');
        tick.setAttribute('stroke-width', isEnd ? '3.5' : (isMid ? '2.5' : '1.5'));
        tick.setAttribute('stroke-linecap', 'round');

        // Label
        const text = document.createElementNS('http://www.w3.org/2000/svg', 'text');
        text.setAttribute('x', x);
        text.setAttribute('y', lineY + 34);
        text.setAttribute('class', 'tick-label' + (isEnd ? ' highlight-label' : ''));
        text.textContent = valStr;

        hitG.appendChild(rect);
        hitG.appendChild(tick);
        hitG.appendChild(text);
        ticksGroup.appendChild(hitG);
      }

      updateMarker(currentVal);
    }

    function selectTick(i) {
      currentVal = i;
      updateMarker(i);
    }

    function updateMarker(i) {
      const x = startX + i * stepWidth;
      coralMarker.style.transform = `translate(${x}px, ${lineY}px)`;
      
      const valStr = ((70 + i) / 100).toFixed(2);
      const plural = i === 1 ? 'hundredth' : 'hundredths';
      
      if (i === 0) {
        markerText.textContent = `0.70 is 0 hundredths past 0.70`;
      } else {
        markerText.textContent = `${valStr} is ${i} ${plural} past 0.70`;
      }

      // Draw jump hops
      hopArcsGroup.innerHTML = '';
      for (let j = 0; j < i; j++) {
        const x1 = startX + j * stepWidth;
        const x2 = startX + (j + 1) * stepWidth;
        const arc = document.createElementNS('http://www.w3.org/2000/svg', 'path');
        const mid = (x1 + x2) / 2;
        const arcHeight = lineY + 14;
        arc.setAttribute('d', `M ${x1} ${lineY + 6} Q ${mid} ${arcHeight} ${x2} ${lineY + 6}`);
        arc.setAttribute('class', 'jump-arc');
        hopArcsGroup.appendChild(arc);
      }
    }

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

Locating Tenths and Hundredths on Number Lines

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Plotting 1.36 on Number Lines</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    }

    body {
      background: #ffffff;
      color: #1e2945;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      user-select: none;
    }

    .controls {
      display: flex;
      gap: 6px;
      margin-bottom: 8px;
      justify-content: center;
      align-items: center;
      width: 100%;
      max-width: 460px;
    }

    .btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      padding: 6px 12px;
      font-size: 12px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      transition: background-color 0.2s, color 0.2s, border-color 0.2s;
      white-space: nowrap;
      flex: 1 1 auto;
    }

    .btn:hover {
      background: #e2e8f0;
      color: #1e2945;
    }

    .btn.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
    }

    .btn-play {
      flex: 0 0 34px;
      padding: 6px 0;
      font-size: 13px;
    }

    @media (max-width: 380px) {
      .btn {
        padding: 5px 6px;
        font-size: 11px;
        border-radius: 6px;
      }
      .btn-play {
        flex: 0 0 28px;
        padding: 5px 0;
      }
    }

    .diagram-area {
      width: 100%;
      max-width: 460px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }

    svg {
      width: 100%;
      height: auto;
      overflow: visible;
      display: block;
    }

    .tick-label {
      font-size: 13px;
      fill: #64748b;
      font-weight: 500;
      text-anchor: middle;
    }

    .key-label {
      font-size: 14px;
      fill: #0f172a;
      font-weight: 700;
      text-anchor: middle;
    }

    .zoom-cone {
      transition: opacity 0.4s ease;
    }

    .bottom-group {
      transition: opacity 0.4s ease;
    }

    .target-glow {
      animation: pulse-ring 2s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
      transform-origin: 270px 210px;
    }

    @keyframes pulse-ring {
      0% {
        r: 6px;
        opacity: 0.8;
      }
      50% {
        r: 15px;
        opacity: 0;
      }
      100% {
        r: 6px;
        opacity: 0;
      }
    }

    .step-badge {
      font-size: 12px;
      font-weight: 700;
      fill: #0284c7;
      letter-spacing: 0.5px;
    }
  </style>
</head>
<body>

  <div class="controls">
    <button id="btn1" class="btn active" onclick="setStep(0)">1. Tenths (1.3 – 1.4)</button>
    <button id="btn2" class="btn" onclick="setStep(1)">2. Hundredths (1.36)</button>
    <button id="playBtn" class="btn btn-play" onclick="togglePlay()" title="Auto Play" aria-label="Toggle Auto Play">⏸</button>
  </div>

  <div class="diagram-area">
    <svg viewBox="0 0 460 295" aria-label="Step by step number line zooming from tenths to hundredths to locate 1.36">
      <defs>
        <linearGradient id="zoomGrad" x1="0%" y1="0%" x2="0%" y2="100%">
          <stop offset="0%" stop-color="#0284c7" stop-opacity="0.18" />
          <stop offset="100%" stop-color="#0284c7" stop-opacity="0.04" />
        </linearGradient>
        <filter id="badgeShadow" x="-10%" y="-20%" width="120%" height="150%">
          <feDropShadow dx="0" dy="2" stdDeviation="3" flood-color="#0f172a" flood-opacity="0.12" />
        </filter>
      </defs>

      
      <g id="topGroup">
        <text x="30" y="24" class="step-badge">STEP 1: TENTHS</text>

        
        <line x1="30" y1="52" x2="430" y2="52" stroke="#94a3b8" stroke-width="2.5" stroke-linecap="round" />

        
        
        <line x1="30" y1="42" x2="30" y2="62" stroke="#0f172a" stroke-width="2.5" />
        <text x="30" y="78" class="key-label">1.0</text>

        
        <line x1="70" y1="45" x2="70" y2="59" stroke="#94a3b8" stroke-width="1.5" />
        <text x="70" y="76" class="tick-label">1.1</text>

        
        <line x1="110" y1="45" x2="110" y2="59" stroke="#94a3b8" stroke-width="1.5" />
        <text x="110" y="76" class="tick-label">1.2</text>

        
        <line x1="150" y1="42" x2="150" y2="62" stroke="#0284c7" stroke-width="2.5" />
        <text x="150" y="78" class="key-label" fill="#0284c7">1.3</text>

        
        <line x1="190" y1="42" x2="190" y2="62" stroke="#0284c7" stroke-width="2.5" />
        <text x="190" y="78" class="key-label" fill="#0284c7">1.4</text>

        
        <line x1="230" y1="45" x2="230" y2="59" stroke="#94a3b8" stroke-width="1.5" />
        <text x="230" y="76" class="tick-label">1.5</text>

        
        <line x1="270" y1="45" x2="270" y2="59" stroke="#94a3b8" stroke-width="1.5" />
        <text x="270" y="76" class="tick-label">1.6</text>

        
        <line x1="310" y1="45" x2="310" y2="59" stroke="#94a3b8" stroke-width="1.5" />
        <text x="310" y="76" class="tick-label">1.7</text>

        
        <line x1="350" y1="45" x2="350" y2="59" stroke="#94a3b8" stroke-width="1.5" />
        <text x="350" y="76" class="tick-label">1.8</text>

        
        <line x1="390" y1="45" x2="390" y2="59" stroke="#94a3b8" stroke-width="1.5" />
        <text x="390" y="76" class="tick-label">1.9</text>

        
        <line x1="430" y1="42" x2="430" y2="62" stroke="#0f172a" stroke-width="2.5" />
        <text x="430" y="78" class="key-label">2.0</text>

        
        <rect x="150" y="44" width="40" height="16" fill="#0284c7" fill-opacity="0.15" rx="3" />
      </g>

      
      <g id="zoomCone" class="zoom-cone" opacity="0.15">
        <polygon points="150,64 190,64 430,210 30,210" fill="url(#zoomGrad)" />
        <line x1="150" y1="64" x2="30" y2="210" stroke="#0284c7" stroke-width="1.5" stroke-dasharray="4 4" />
        <line x1="190" y1="64" x2="430" y2="210" stroke="#0284c7" stroke-width="1.5" stroke-dasharray="4 4" />
      </g>

      
      <g id="bottomGroup" class="bottom-group" opacity="0.25">
        <text x="30" y="172" class="step-badge" fill="#16a34a">STEP 2: HUNDREDTHS</text>

        
        <line x1="30" y1="210" x2="430" y2="210" stroke="#94a3b8" stroke-width="2.5" stroke-linecap="round" />

        
        
        <line x1="30" y1="200" x2="30" y2="220" stroke="#0284c7" stroke-width="2.5" />
        <text x="30" y="238" class="key-label" fill="#0284c7">1.30</text>

        
        <line x1="70" y1="203" x2="70" y2="217" stroke="#94a3b8" stroke-width="1.5" />
        <text x="70" y="235" class="tick-label">.31</text>

        <line x1="110" y1="203" x2="110" y2="217" stroke="#94a3b8" stroke-width="1.5" />
        <text x="110" y="235" class="tick-label">.32</text>

        <line x1="150" y1="203" x2="150" y2="217" stroke="#94a3b8" stroke-width="1.5" />
        <text x="150" y="235" class="tick-label">.33</text>

        <line x1="190" y1="203" x2="190" y2="217" stroke="#94a3b8" stroke-width="1.5" />
        <text x="190" y="235" class="tick-label">.34</text>

        <line x1="230" y1="201" x2="230" y2="219" stroke="#64748b" stroke-width="1.5" />
        <text x="230" y="235" class="tick-label" font-weight="600">.35</text>

        
        <line x1="270" y1="198" x2="270" y2="222" stroke="#16a34a" stroke-width="2" />
        <text x="270" y="235" class="tick-label" fill="#16a34a" font-weight="700">.36</text>

        <line x1="310" y1="203" x2="310" y2="217" stroke="#94a3b8" stroke-width="1.5" />
        <text x="310" y="235" class="tick-label">.37</text>

        <line x1="350" y1="203" x2="350" y2="217" stroke="#94a3b8" stroke-width="1.5" />
        <text x="350" y="235" class="tick-label">.38</text>

        <line x1="390" y1="203" x2="390" y2="217" stroke="#94a3b8" stroke-width="1.5" />
        <text x="390" y="235" class="tick-label">.39</text>

        
        <line x1="430" y1="200" x2="430" y2="220" stroke="#0284c7" stroke-width="2.5" />
        <text x="430" y="238" class="key-label" fill="#0284c7">1.40</text>

        
        <circle id="pulseDot" cx="270" cy="210" r="8" fill="#16a34a" opacity="0" class="target-glow" />
        <circle id="targetDot" cx="270" cy="210" r="6" fill="#16a34a" stroke="#ffffff" stroke-width="2" />

        
        <g id="calloutBadge" transform="translate(230, 272)">
          <rect x="-165" y="-13" width="330" height="26" rx="13" fill="#16a34a" filter="url(#badgeShadow)" />
          <text x="0" y="4.5" text-anchor="middle" fill="#ffffff" font-size="11.5px" font-weight="700" letter-spacing="0.2px">1.36 = 1 whole + 3 tenths + 6 hundredths</text>
        </g>
      </g>
    </svg>
  </div>

  <script>
    let currentStep = 0;
    let timer = null;
    let isPlaying = true;

    const btn1 = document.getElementById('btn1');
    const btn2 = document.getElementById('btn2');
    const playBtn = document.getElementById('playBtn');
    const zoomCone = document.getElementById('zoomCone');
    const bottomGroup = document.getElementById('bottomGroup');
    const pulseDot = document.getElementById('pulseDot');

    function renderStep() {
      if (currentStep === 0) {
        btn1.classList.add('active');
        btn2.classList.remove('active');
        zoomCone.setAttribute('opacity', '0.15');
        bottomGroup.setAttribute('opacity', '0.25');
        pulseDot.style.display = 'none';
      } else {
        btn1.classList.remove('active');
        btn2.classList.add('active');
        zoomCone.setAttribute('opacity', '1');
        bottomGroup.setAttribute('opacity', '1');
        pulseDot.style.display = 'block';
      }
    }

    function setStep(step) {
      currentStep = step;
      renderStep();
      if (isPlaying) {
        resetTimer();
      }
    }

    function resetTimer() {
      clearInterval(timer);
      if (isPlaying) {
        timer = setInterval(() => {
          currentStep = (currentStep + 1) % 2;
          renderStep();
        }, 3600);
      }
    }

    function togglePlay() {
      isPlaying = !isPlaying;
      playBtn.textContent = isPlaying ? '⏸' : '▶';
      if (isPlaying) {
        resetTimer();
      } else {
        clearInterval(timer);
      }
    }

    // Initialize
    renderStep();
    resetTimer();
  </script>
</body>
</html>

<!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;
    }
    body {
      width: 100%;
      min-height: 100%;
      background: #f8fafc;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px;
    }
    .container {
      width: 100%;
      max-width: 600px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 14px;
    }
    .banner {
      background: #eff6ff;
      border: 1.5px solid #bfdbfe;
      color: #1d4ed8;
      font-weight: 700;
      font-size: clamp(15px, 4vw, 18px);
      padding: 8px 18px;
      border-radius: 20px;
      text-align: center;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .banner span.highlight {
      color: #0284c7;
      font-size: clamp(17px, 4.5vw, 20px);
      font-weight: 800;
    }
    .svg-container {
      width: 100%;
      max-width: 560px;
      height: auto;
      overflow: visible;
    }
    svg {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
    }
    .tick-label {
      font-size: 16px;
      font-weight: 600;
      fill: #475569;
      text-anchor: middle;
      user-select: none;
    }
    .tick-label.major {
      font-size: 17px;
      font-weight: 700;
      fill: #1e2945;
    }
    .tick-label.target {
      font-size: 19px;
      font-weight: 800;
      fill: #0284c7;
    }
    .hop-arc {
      fill: none;
      stroke: #0ea5e9;
      stroke-width: 3;
      stroke-linecap: round;
      stroke-dasharray: 140;
      stroke-dashoffset: 140;
      transition: stroke-dashoffset 0.35s ease-out, opacity 0.3s ease;
      opacity: 0;
    }
    .hop-arc.active {
      stroke-dashoffset: 0;
      opacity: 1;
    }
    .hop-arc.past {
      stroke-dashoffset: 0;
      opacity: 0.6;
      stroke: #38bdf8;
    }
    .target-dot {
      fill: #0284c7;
      stroke: #ffffff;
      stroke-width: 3.5;
      filter: drop-shadow(0 2px 5px rgba(2, 132, 199, 0.45));
      transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
      transform-origin: 360px 105px;
      opacity: 0;
      transform: scale(0);
    }
    .target-dot.visible {
      opacity: 1;
      transform: scale(1);
    }
    .target-pin {
      opacity: 0;
      transition: opacity 0.3s ease, transform 0.3s ease;
      transform: translateY(-4px);
    }
    .target-pin.visible {
      opacity: 1;
      transform: translateY(0);
    }
    .controls {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .btn {
      background: #1e2945;
      color: #ffffff;
      border: none;
      border-radius: 8px;
      padding: 8px 16px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: background-color 0.2s ease, opacity 0.2s ease;
      outline: none;
    }
    .btn:hover {
      background: #2b395b;
    }
    .btn:active {
      opacity: 0.85;
    }
    .step-indicator {
      font-size: 14px;
      font-weight: 600;
      color: #475569;
    }
    .fraction-hint {
      font-size: 13.5px;
      color: #64748b;
      display: flex;
      align-items: center;
      gap: 6px;
      text-align: center;
    }
  </style>
</head>
<body>

  <div class="container">
    <div class="banner" id="bannerText">
      <span>7 hops of 0.1 = <span class="highlight">0.7</span></span>
    </div>

    <div class="svg-container">
      <svg viewBox="15 35 510 115" xmlns="http://www.w3.org/2000/svg">
        <defs>
          
          <marker id="arrow" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
            <path d="M 1 2 L 7 5 L 1 8 z" fill="#1e2945"/>
          </marker>
        </defs>

        
        <line x1="25" y1="105" x2="515" y2="105" stroke="#1e2945" stroke-width="2.5" marker-start="url(#arrow)" marker-end="url(#arrow)" />

        
        <g id="arcsGroup">
          <path id="arc0" class="hop-arc" d="M 45,105 A 22.5,22.5 0 0,1 90,105" />
          <path id="arc1" class="hop-arc" d="M 90,105 A 22.5,22.5 0 0,1 135,105" />
          <path id="arc2" class="hop-arc" d="M 135,105 A 22.5,22.5 0 0,1 180,105" />
          <path id="arc3" class="hop-arc" d="M 180,105 A 22.5,22.5 0 0,1 225,105" />
          <path id="arc4" class="hop-arc" d="M 225,105 A 22.5,22.5 0 0,1 270,105" />
          <path id="arc5" class="hop-arc" d="M 270,105 A 22.5,22.5 0 0,1 315,105" />
          <path id="arc6" class="hop-arc" d="M 315,105 A 22.5,22.5 0 0,1 360,105" />
        </g>

        
        
        <line x1="45" y1="92" x2="45" y2="118" stroke="#1e2945" stroke-width="2.5" stroke-linecap="round" />
        <text x="45" y="140" class="tick-label major">0.0</text>

        
        <line x1="90" y1="97" x2="90" y2="113" stroke="#64748b" stroke-width="1.8" stroke-linecap="round" />
        <text x="90" y="139" class="tick-label">0.1</text>

        
        <line x1="135" y1="97" x2="135" y2="113" stroke="#64748b" stroke-width="1.8" stroke-linecap="round" />
        <text x="135" y="139" class="tick-label">0.2</text>

        
        <line x1="180" y1="97" x2="180" y2="113" stroke="#64748b" stroke-width="1.8" stroke-linecap="round" />
        <text x="180" y="139" class="tick-label">0.3</text>

        
        <line x1="225" y1="97" x2="225" y2="113" stroke="#64748b" stroke-width="1.8" stroke-linecap="round" />
        <text x="225" y="139" class="tick-label">0.4</text>

        
        <line x1="270" y1="94" x2="270" y2="116" stroke="#1e2945" stroke-width="2.2" stroke-linecap="round" />
        <text x="270" y="140" class="tick-label major">0.5</text>

        
        <line x1="315" y1="97" x2="315" y2="113" stroke="#64748b" stroke-width="1.8" stroke-linecap="round" />
        <text x="315" y="139" class="tick-label">0.6</text>

        
        <line x1="360" y1="92" x2="360" y2="118" stroke="#0284c7" stroke-width="2.8" stroke-linecap="round" />
        <text x="360" y="141" class="tick-label target">0.7</text>

        
        <line x1="405" y1="97" x2="405" y2="113" stroke="#64748b" stroke-width="1.8" stroke-linecap="round" />
        <text x="405" y="139" class="tick-label">0.8</text>

        
        <line x1="450" y1="97" x2="450" y2="113" stroke="#64748b" stroke-width="1.8" stroke-linecap="round" />
        <text x="450" y="139" class="tick-label">0.9</text>

        
        <line x1="495" y1="92" x2="495" y2="118" stroke="#1e2945" stroke-width="2.5" stroke-linecap="round" />
        <text x="495" y="140" class="tick-label major">1.0</text>

        
        <g id="targetPin" class="target-pin">
          <rect x="335" y="42" width="50" height="26" rx="6" fill="#0284c7" />
          <polygon points="360,73 353,67 367,67" fill="#0284c7" />
          <text x="360" y="59" font-size="14" font-weight="700" fill="#ffffff" text-anchor="middle" dominant-baseline="middle">0.7</text>
        </g>

        
        <circle id="targetDot" class="target-dot" cx="360" cy="105" r="7.5" />
      </svg>
    </div>

    
    <div class="controls">
      <button class="btn" id="playBtn">▶ Replay</button>
      <span class="step-indicator" id="stepIndicator">Hop 7 of 7</span>
    </div>

    <div class="fraction-hint">
      <span>Each segment = <strong>1 tenth (0.1)</strong></span>
    </div>
  </div>

  <script>
    const TOTAL_HOPS = 7;
    const arcs = Array.from({ length: TOTAL_HOPS }, (_, i) => document.getElementById(`arc${i}`));
    const targetDot = document.getElementById('targetDot');
    const targetPin = document.getElementById('targetPin');
    const banner = document.getElementById('bannerText');
    const stepIndicator = document.getElementById('stepIndicator');
    const playBtn = document.getElementById('playBtn');

    let currentHop = 0;
    let timer = null;
    let isPlaying = false;

    function renderHop(hop) {
      arcs.forEach((arc, i) => {
        arc.classList.remove('active', 'past');
        if (i < hop - 1) {
          arc.classList.add('past');
        } else if (i === hop - 1) {
          arc.classList.add('active');
        }
      });

      if (hop === 0) {
        banner.innerHTML = '<span>Start at <strong>0.0</strong></span>';
        stepIndicator.textContent = 'Hop 0 of 7';
        targetDot.classList.remove('visible');
        targetPin.classList.remove('visible');
      } else if (hop < TOTAL_HOPS) {
        const val = (hop * 0.1).toFixed(1);
        banner.innerHTML = `<span>${hop} hop${hop > 1 ? 's' : ''} of 0.1 = <span class="highlight">${val}</span></span>`;
        stepIndicator.textContent = `Hop ${hop} of 7`;
        targetDot.classList.remove('visible');
        targetPin.classList.remove('visible');
      } else {
        banner.innerHTML = '<span>7 hops of 0.1 = <span class="highlight">0.7</span></span>';
        stepIndicator.textContent = 'Hop 7 of 7 (Reached 0.7)';
        targetDot.classList.add('visible');
        targetPin.classList.add('visible');
      }
    }

    function step() {
      if (currentHop < TOTAL_HOPS) {
        currentHop++;
        renderHop(currentHop);
        timer = setTimeout(step, 650);
      } else {
        isPlaying = false;
        playBtn.textContent = '▶ Replay';
      }
    }

    function startAnimation() {
      clearTimeout(timer);
      currentHop = 0;
      renderHop(0);
      isPlaying = true;
      playBtn.textContent = '⏸ Pause';
      timer = setTimeout(step, 500);
    }

    function pauseAnimation() {
      clearTimeout(timer);
      isPlaying = false;
      playBtn.textContent = '▶ Resume';
    }

    playBtn.addEventListener('click', () => {
      if (isPlaying) {
        pauseAnimation();
      } else {
        if (currentHop >= TOTAL_HOPS) {
          startAnimation();
        } else {
          isPlaying = true;
          playBtn.textContent = '⏸ Pause';
          step();
        }
      }
    });

    // Start on mount with initial complete state visible briefly, then run smooth demo
    renderHop(TOTAL_HOPS);
    setTimeout(startAnimation, 1200);
  </script>
</body>
</html>

Splitting One Whole Into Ten Equal Jumps

Naming the Point in Tenths

Zooming In: Hundredths Between the Tenths

Reading a Line When the Marks Have No Labels

Decimals on Rulers, Scales and Thermometers

Justifying an Answer With Precise Math Language

Does This Answer Make Sense?

math

Decimals on the Number Line

Zooming In: Plotting Thousandths on Magnified Number Lines

Comparing Decimals with One Decimal Place Using Place Value

Comparing Decimals with Two Decimal Places Using Place Value

Comparing Decimals with Unequal Numbers of Decimal Places

Comparing and Ordering Numbers with Up to Three Decimal Places

Rounding Decimals with One Decimal Place to the Nearest Whole Number

Rounding Decimals with Two Decimal Places to the Nearest Whole Number

Rounding Decimals to the Nearest Tenth Using Number Lines

Rounding Decimals to the Nearest Whole, Tenth, and Hundredth

Plotting, Comparing, Ordering, and Rounding Decimals

Understanding Decimal Place Value: Tenths

Understanding Decimal Place Value: Hundredths

Comparing and Ordering Decimals Using Models

Relating Decimals to Fractions for Tenths and Hundredths

Finding Decimals on Number Lines to Tenths and Hundredths

Using Money to Model and Compare Decimals

Decimal Place Value and Relationships

Décomposition additive d'un nombre décimal

Décomposition avec fractions décimales

Écrire sous forme d'une unique fraction décimale

Passer d'une fraction à un nombre décimal

Les entiers sont des nombres décimaux particuliers

Explorer les dix-millièmes et au-delà

Écritures décimales dans les grandeurs et mesures

Nombres décimaux et monnaie en euros

Reconnaître les fractions qui ne sont pas décimales

Bilan : jongler entre les écritures décimales

Fractions décimales, décompositions et applications

Lire l'abscisse d'un point entier sur une demi-droite

Repérer des dixièmes sur une demi-droite graduée

Repérer des centièmes sur une demi-droite graduée

Placer un nombre décimal au dixième près

Placer un nombre décimal au centième près

Zoomer sur un intervalle d'une demi-droite graduée

Repérage et placement de décimaux sur demi-droite graduée

Comparer deux décimaux par leurs parties entières

Comparer deux décimaux ayant la même partie entière

Déjouer le piège de la longueur de la partie décimale

Utiliser les symboles <, > et = avec les décimaux

Comparer et ranger les nombres décimaux

Ranger des décimaux sous écritures mixtes

Identifier maximum et minimum dans une liste décimale

Ordonner des grandeurs et mesures décimales

Utiliser la droite graduée pour valider un ordre

Entraînement guidé au tri et rangement de décimaux

Évaluation formative : repérage et ordre des décimaux

Comparaison et rangement des nombres décimaux

Encadrer un décimal par deux entiers consécutifs

Encadrer un décimal au dixième près

Encadrer un décimal au centième près

Intercaler un nombre décimal entre deux entiers

Intercaler un nombre décimal entre deux décimaux

Comprendre qu'il y a une infinité de décimaux entre deux nombres

Encadrer et intercaler des nombres décimaux

Comprendre la troncature d'un nombre

Arrondir un nombre décimal à l'unité

Arrondir un nombre décimal au dixième

Arrondir un nombre décimal au centième

Distinguer valeur approchée par défaut et par excès

Valeur arrondie des fractions non décimales usuelles

Découvrir le nombre Pi et ses arrondis

Choisir le niveau d'arrondi adapté au contexte

Résoudre des énigmes d'intercalation et d'arrondis

Bilan : maîtriser encadrements, intercalations et arrondis

Troncature, arrondis et valeurs approchées

Découvrir les fractions décimales : dixièmes et centièmes

Représenter des dixièmes et des centièmes sur un quadrillage

Relations entre dixièmes, centièmes et millièmes

Placer une fraction décimale sur une demi-droite graduée

Repérer un point par une fraction décimale sur une demi-droite graduée

Zoomer sur la droite graduée entre deux entiers

Fractions décimales : découverte et repérage

Décomposer une fraction décimale en un entier et une fraction inférieure à 1

Décomposer une fraction décimale en somme d'entiers, dixièmes, centièmes et millièmes

OGM.5.DEC.2

Aligned learning resources

Related diagrams