Volume of a rectangular prism is still length × width × height — but now the edges can be fractions or decimals. That means you need to multiply three numbers and handle simple fractions and decimals. Warm those feeder skills and the prism volume formula clicks.
Answer these 3, then press Show my path. No grade — this just points you to the right level.
1. What is 5 × 2 × 3?
2. What is 0.5 × 4?
3. What is 1/2 × 6?
The rule never changes: V = length × width × height. When an edge is a fraction or decimal, just multiply carefully. Half of a number means multiply by 1/2 (or 0.5).
Your quick check picks one for you, but you can switch any time:
Level 0 Multiply three whole numbers first, then meet a decimal.
A. 2 × 2 = ___
2 × 2 = 4.
B. Now 4 × 5 = ___
4 × 5 = 20.
C. So 2 × 2 × 5 = ___
2 × 2 = 4, then 4 × 5 = 20.
Level 1 Bring in a fraction or decimal edge.
A. 1/2 × 8 = ___
Half of 8 is 4.
B. 0.5 × 10 = ___
0.5 is half; half of 10 is 5.
C. A prism is 4 × 3 × 2 units. What is its volume? (cubic units)
4 × 3 = 12, then 12 × 2 = 24.
Level 2 Stretch to volume with a fraction or decimal edge.
A. A prism is 6 × 2 × 0.5 units. What is its volume? (cubic units)
6 × 2 = 12, then 12 × 0.5 = 6.
B. A prism is 1/2 × 4 × 5 units. What is its volume? (cubic units)
1/2 × 4 = 2, then 2 × 5 = 10.
1. What is 0.5 × 6?
Half of 6 is 3.
2. A prism is 5 × 2 × 3 units. What is its volume? (cubic units)
5 × 2 = 10, then 10 × 3 = 30.
You've practiced exactly what Lesson 10-2 uses. Time to dive in.
Start Lesson 10-2 →