What is the volume of a rectangular prism with length 3, width 4, and height 5?

• A. 72
• B. 60
• C. 45
• D. 84

Answer: (B)

Volume is found by multiplying all three dimensions of a rectangular prism: length × width × height. This tells you how much space is inside the shape, in cubic units. For 3, 4, and 5, you can multiply in any order: 3 × 4 = 12, then 12 × 5 = 60. So the volume is 60 cubic units. The other numbers would come from not using all three dimensions or from altering one of them by mistake.