Lesson objective: Extend understanding of area measure and volume formula to discover that the area can be multiplied by the height of a right rectangular prism to compute volume.

Students bring prior knowledge of area from 3.MD.5-6 and volume from 5.MD.C.1-4. This prior knowledge is extended to computing volume as students utilize the volume formula b x h where b is the area of the base. A conceptual challenge students may encounter is understanding that the base area is being multiplied by the dimension of height.

The concept is developed through work with a right rectangular prism, which shows students a base area being iterated by the dimension of the height.

This work helps students deepen their understanding of operations because the base area is being muliplied by the height of a right rectangular prism.

Students engage in Mathematical Practice 6 (attend to precision) as students will specify and differentiate between units of measure (unit, square unit, cubic unit).

Students engage in Mathematical Practice 7: Look for and Make Use of Structure as they connect the structure to multiplicative reasoning, recognizing the iteration of layers when computing volume.

**Key vocabulary:**

- area
- iterate
- right rectangular prism
- volume

**Special materials needed:**

- graph paper
- isometric dot paper
- unit cubes