Measuring things
We use special units to measure. Each thing has its own unit.
- Length (how long): centimetre (cm) and metre (m).
- Mass (how heavy): kilogram (kg).
- Volume of liquid (how much water): litre.
Key idea
Small things use small units. A pencil is measured in cm. A room is measured in m.
Picking the right unit
Worked example
A bag of rice is heavy. We measure how heavy it is in kg. A bottle of water is measured in litre.
Remember
- Length → cm or m.
- Mass → kg.
- Volume of liquid → litre.