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Mathematics > Grade 1 > Geometry
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Mathematics | Grade : 1

Domain - Geometry

Cluster - Reason with shapes and their attributes.

[1.G.A.3] - Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of. Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.

Resources:


  • Decompose shapes
    Given a geometric shape, identify geometric shapes that meet without overlap to form the given shape.
  • Partition
    A process of dividing an object into parts.

Predecessor Standards:

No Predecessor Standards found.

Successor Standards:

  • 2.G.A.3
    Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths. Recognize that equal shares of identical wholes need not have the same shape.

Same Level Standards:

  • 1.G.A.2
    Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles) or three-dimensional shapes (cubes, right rectangular prisms, right circular cones, and right circular cylinders) to create a composite shape, and compose new shapes from the composite shape. [Note: Students do not need to learn formal names such as "right rectangular prism"]