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      "title": "A whole new way to see fractions",
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      "title": "Physical or digital? Choose the action you need",
      "summary": "Compare what learners can do with each format, and choose the material that fits the mathematical task.",
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      "title": "Make the exchange visible",
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      "title": "Questions that make room for thinking",
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        "operations",
        "fractions"
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        "counting",
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        "operations"
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        "measurement"
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        "counting",
        "place-value"
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        "operations",
        "measurement"
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        "number-sense",
        "fractions"
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      "title": "Number Lines",
      "summary": "Lines with equal unit spacing for locating numbers, comparing distance, and representing operations.",
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        "operations",
        "fractions"
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      "title": "Pattern Blocks",
      "summary": "Geometric pieces for building shapes, exploring symmetry, and comparing parts of a whole.",
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        "fractions",
        "patterns-and-algebra"
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      "id": "manipulatives/play-money",
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      "summary": "Replica coins and notes for comparing values, making totals, and finding equivalent combinations.",
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        "measurement"
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        "fractions"
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      "summary": "Bead racks arranged in groups of five and ten for showing numbers and comparing addition strategies.",
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      "title": "Sketch Pad",
      "summary": "An open drawing space for turning a math idea into a picture, revising it, and explaining your thinking.",
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        "geometry"
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        "fractions"
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      "title": "Teaching Clocks",
      "summary": "Moveable clock faces for connecting hand positions, elapsed time, and everyday schedules.",
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        "number-sense"
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      "summary": "Temperature scales, including classroom models, for reading intervals and comparing changes.",
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      "summary": "Connect number words with objects, organized groups, and the total in a collection.",
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      "topics": [
        "fractions"
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      "summary": "Choose units, read scales, and distinguish what is being measured.",
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      "summary": "Explore quantities, compare numbers, and find useful relationships between them.",
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      "id": "topics/operations",
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      "title": "Operations",
      "summary": "Use materials to explain joining, separating, grouping, sharing, and comparing.",
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        "operations"
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      "title": "Place Value",
      "summary": "Make the grouping of ones, tens, hundreds, and smaller units visible.",
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      "summary": "Choose purposeful materials, ask useful questions, and connect models with mathematical explanations.",
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