Skill: Use the formula for rectangular-prism volume

The volume of a rectangular prism is the amount of space inside it. To find the volume, multiply its length, width, and height:

$$V=lwh$$

Make sure all three measurements use the same unit. The answer is written in cubic units because volume measures three dimensions.

Example: A rectangular prism is $8\text{ cm}$ long, $3\text{ cm}$ wide, and $2\text{ cm}$ high. What is its volume?

1. Identify the dimensions:

   • $l=8\text{ cm}$
   • $w=3\text{ cm}$
   • $h=2\text{ cm}$

2. Use the formula:

$$V=lwh$$

3. Substitute the measurements:

$$V=(8)(3)(2)$$

4. Multiply:

$$8\times3\times2=48$$

5. Write the answer with cubic units:

$$\boxed{48\text{ cm}^3}$$

The volume of the rectangular prism is $48$ cubic centimeters.