Lesson objective: Compose larger shapes out of smaller shapes.

This lesson helps to build procedural skill with two-dimensional shapes. Pattern blocks are used here because they support students' understanding of how shapes can be composed using smaller shapes. This work develops students' understanding that simple shapes can be joined to form larger shapes (two squares can be joined full side to full side to form a rectangle).

Students engage in Mathematical Practice 5 (Use tools appropriately and strategically) as they use pattern blocks to explore how shapes can be put together to make larger shapes.

**Key vocabulary:**

- hexagon
- parallelogram
- rectangle
- rhombus
- side
- square
- trapezoid
- triangle

**Special materials needed:**