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    • ▾1st grade
      • ▸Place value
        • •Count and write numbers within 120
        • •Skip count by 3s and 4s
        • •Place value with tens
        • •Compare two-digit numbers
      • ▸Addition and subtraction
        • •River crossing puzzles
        • •Add and subtract within 20
        • •Add within 20, word problems involving three addends
        • •Use one addition problem to solve another
        • •Add by making tens
        • •Subtract by adding
        • •Understand the equals sign
        • •Add and subtract within 20, missing number problems
        • •Add and subtract within 20, word problems
        • •Add within 100, concrete and pictorial
        • •10 more or 10 less
        • •Subtract multiples of ten from multiples of ten
      • ▾Measurement, data, and geometry
        • •Order without tools
        • •Measure given a unit
        • •Bar and picture graphs having three categories of data
        • •Tell and write time, hour and half-hours
        • •Definitions of shapes
        • •Compose 2D and 3D shapes
        • •Halves and quarters
     › 1st grade › Measurement, data, and geometry

    Definitions of shapes

    Recognize that shape is independent of scale, color, and orientation. Identify squares, rectangles, triangles, circles, hexagons (just regular ones for now), trapezoids, and rhombuses.

    Again, why so vague? Don't say shape, list the shapes!

    Watch these Khan Academy videos:

    • Recognizing shapes
    • Cousin Fal's shape collection

    Name shapes 3 by Khan Academy

    Conclude by leading this investigation:

    Unifix Cubes
    by MathPickle

    1.G.A.1: Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size); build and draw shapes to possess defining attributes.

    Lessons and practice problems