Grade 1 · Geometry

CCSS.MATH.CONTENT.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.

Read this standard on the official Common Core site

Lessons that teach this standard

• Building Shapes: Sides, Corners and Putting Shapes Together

  Count the sides and corners of flat shapes, compare flat and solid shapes, build shapes with sticks and clay, and put small shapes together to make bigger ones.