Grade 3 · Unit 5: Using units of measurement

Volume and capacity

How much space does it take? How much does it hold?

Water tanks

A rooftop tank holds 1000 litres of water. That is its capacity. The space the tank takes up is its volume.

Counting cubes

Build shapes with cubes. Count the cubes to find the volume. 4 long, 2 wide, 2 high = 16 cubic units.

Reading scales

This jug shows 1500 ml. 1000 ml = 1 litre, so 1500 ml = 1½ litres. Read the scale at eye level.

Choosing units

Use millilitres for small amounts. Use litres for big amounts. A teaspoon holds about 5 ml.

What I learnt

• I can find volume by counting cubes.
• I can read capacity in ml and l.