# 1ST GRADE GEOMETRY

1st Grade Mega Math Bundle aligned with the 1st Grade Geometry Common Core State Standards. Try some of the samples listed in blue below each standard or download the bundle and have instant access to hundreds of easy-prep, engaging resources to simplify your math lesson planning and make active engagement through hands-on math instruction an integral part of your classroom.

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#### Reason with shapes and their attributes

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.

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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.

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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.

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