# Unit 1 Finding Volume (Family Materials)

In this unit, students find the volume of rectangular prisms and figures composed of two prisms.

Near the end of the unit, find the volume of these figures with your student.

Questions that may be helpful as they work:

• How are the 2 problems the same? How are they different?

• Can you explain or show me how you found the volume?

• How did you know you needed that number or piece of information?

## Section A Unit Cubes and Volume

In this section, students learn to call the amount of space an object takes up volume. Volume is measured in cubes. For example, this prism has a volume of 120 cubes.

To find the volume of any prism, students can find the number of cubes in one layer and multiply that number by the number of layers. In this example, students might describe this prism as having 5 layers of 24 cubes.
They can find the number of cubes by multiplying 5 and 24. So, .

## Section B Expressions for Finding Volume

In this section, students find the volume of a rectangular prism by multiplying the side lengths or by multiplying the area of the base by the height.