First Grade Math


2d and 3d Shapes


Common Core Standards Addressed

*CC.1.G.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.

*CC.1.G.2 Compose two-dimensional shapes or three-dimensional shapes create a composite shape, and compose new shapes from the composite shape.

*CC.1.G.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.

Unit Goals

*Using defining attributes to sort shapes

*Describing attributes of two-dimensional shapes

*Using objects to compose new two-dimensional shapes

*Decomposing combined shapes into shapes

*Decomposing two-dimensional shapes into parts

*Identifying equal and unequal parts or shares into two-dimensional shapes

*Partitioning circles and rectangles into two equal shares

*Partitioning circles and rectangles into four equal shares

*Identifying and describing three-dimensional shapes according to defining attributes

*Composing a new shape by combining three-dimensional shapes

*Identifying two-dimensional shapes on three-dimensional shapes

*Building fluency for addition and subtraction

*Solving addition and subtraction word problems

Tips to Help Your Child At Home

*Look for these math books at the library and read them with your child

* When a Line Bends a Shape Begins

*Shape by Shape

*A Circle Here, A Square There

*Icky Bug Shapes