
Reason with shapes and their attributes
1.G.A.1
Distinguish between defining attributes (e.g. triangles are closed and
threesided) versus nondefining attributes (e.g., color, orientation,
overall size); build and draw shapes to possess defining attributes.
Possible Activities:
My 2D Shape Book
Geoboard Squares
Math Read Aloud Task Cards:
Mouse Shapes
When a Line Bends ...
Also included in 1st Grade Math Centers:
**Comparing 2D Shapes
**Comparing 3D Shapes
1.G.A.2 Compose twodimensional shapes (rectangles, squares,
trapezoids, triangles, halfcircles, and quartercircles) or
threedimensional 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.
Possible Activities:
Putting Shapes Together
Pattern Block Triangles
Tangram Squares
Math Read Aloud Task Cards:
Grandfather Tang's Story
Also included in 1st Grade Math Centers:
** Make a Hexagon
** Pattern Block Numbers
** Tangram Triangles
** Shape Patterns
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.
Possible Activities:
Equal Parts of a Square (ver. 1)
Also included in 1st Grade Math Centers:
** Fraction Pictures
** Equal Parts of a Square (ver. 2)