Volume Practice
Practise finding the volume of boxes and cubes — how much space a solid takes up.
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How to find volume
Volume measures how much space a 3-D solid fills, counted in cubic units. For box shapes it’s the same idea as area, with one more dimension: multiply all three.
- Rectangular prism (box): length × width × height.
- Cube: side × side × side (side cubed).
- Another way: find the area of the base, then multiply by the height.
Worked examples
Tips & common mistakes
Volume is in cubic units because you multiply three lengths. The order doesn’t matter — 2 × 3 × 4 is the same as 4 × 3 × 2 — so multiply in whatever order is easiest. Type the number.
- Multiplying only two of the three dimensions (that gives area, not volume).
- Adding the dimensions instead of multiplying.
- For a cube, forgetting it’s the side multiplied three times.
Frequently asked questions
How do you find the volume of a box?
Multiply length × width × height. A 2 by 3 by 4 box has a volume of 24 cubic units.
What is the volume of a cube?
Side × side × side. A cube with side 3 has volume 3³ = 27 cubic units.
Why is volume in cubic units?
Because you multiply three lengths together, filling the solid with unit cubes.
What’s the difference between area and volume?
Area covers a flat surface (square units, two dimensions); volume fills a solid (cubic units, three dimensions).
What grade is volume?
Volume of rectangular prisms is a grade 5 skill that continues into grade 6.