ALEX Resources

   View Standards     Standard(s): [MA2019] (0) 23 :

23. Use simple shapes to compose larger shapes.

Example: Join two triangles with full sides touching to make a rectangle.

[MA2019] (1) 22 :

22. 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.

Teach your students about the composition and decomposition of shapes with the help of this game from Peg + Cat. Help Super Peg and Cat Guy protect the citizens of Mathtropolis. Shapes all over the city have been taken apart and it is up to these heroes to put them back together and save the day!

   View Standards     Standard(s): [MA2019] (0) 21 :

21. Analyze and compare two- and three-dimensional shapes, in different sizes and orientations, using informal language to describe their similarities, differences, parts (number of sides and vertices or "corners"), and other attributes.

Example: Having sides of equal length.

[MA2019] (0) 23 :

23. Use simple shapes to compose larger shapes.

Example: Join two triangles with full sides touching to make a rectangle.

Two-Headed Monster has arrived to demonstrate the rectangle shape. The problem is, they don't seem to know what a rectangle looks like. Instead, they pull out two triangles. They discover, however, that two triangles can be used to make one rectangle. This resource teaches shapes.