# Lesson 3 Volumes of Prism Drawings

Let’s use layers to find volume.

## Warm-up Number Talk: Multiplication

Find the value of each expression mentally.

## Activity 1 Build Rectangular Prisms

The prisms on the cards are completely packed with unit cubes.

Pick a card.

Build the rectangular prism.

Find the volume. Explain how you found the volume to your partner.

Repeat.

## Activity 2 Layers, layers, and more layers

The prisms are completely packed with unit cubes. Determine the volume of each prism. Explain or show your reasoning.

## Practice Problem

## Problem 1

What is the volume of the rectangular prism? Explain or show your reasoning.