Volume & capacity
Count cubes in a box, and use litres and millilitres.
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Volume is how many cubes fit inside.
Look: One layer has 4 × 3 = 12 cubes. 2 layers: 24 cubes.
✏️ Your turn!
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1Box 6 × 2 × 3 cm. Volume?
2How many ml in 2 litres?
3Cube with 5 cm sides. Volume?
! Careful!
✗Adding the lengths.
✓Volume multiplies them.
✗Writing volume in cm².
✓Volume uses cubes: cm³.
See the whole lesson on one page
Volume is how many cubes fit inside.
Count the cubes in one layer, then times by the number of layers. So volume = length × width × height.
Think of it like thisFill a box with ice cubes, layer by layer. Count the cubes: that is the volume.
- Litre
- 1,000 ml. A 10 cm cube holds 1 litre.
Solved together
A fish tank is 50 cm long, 30 cm wide, 40 cm high. How many litres does it hold?
Multiply the three lengths.
50 × 30 = 1,5001,500 × 40 = 60,000 cm³1,000 cm³ is 1 litre.
60,000 ÷ 1,000 = 60
AnswerIt holds 60 litres.
Now practise it
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