Grade 1: Unit G. A. 1-3, Reason with shapes and their 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.
Essential Skills and Knowledge

• Ability to use concrete manipulatives (e.g., pattern blocks, attribute blocks, cubes, rectangular prisms, cones, cylinders, geoboards, paper & pencil,) to create composite shapes from 2 or 3 dimensional shapes




It is important for students in grade 1 to develop the ability to describe, use and visualize the effect of composing and decomposing shapes. They should begin to see that there is a mathematical connection between the ability to compose and decompose shapes and the ability to compose and decompose numbers.
Students may use pattern blocks, plastic shapes, tangrams, clay, large wooden blocks, cutouts of shapes, or technology to make new shapes. They should combine these shapes to make new shapes.

Examples:



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From: http://commoncoretools.files.wordpress.com/2012/06/ccss_progression_g_k6_2012_06_27.pdf

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In grade 1, students learn to perceive a combination of shapes as a single new shape (e.g., recognizing that two isosceles triangles can be combined to make a rhombus, and simultaneously seeing the rhombus and the two triangles). Thus, they develop competencies that include solving shape puzzles, constructing designs with shapes, and creating and maintaining a shape as a unit.





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