Free practice on Metric System for Class 3, following the Cameroon primary school curriculum (English subsystem). Every answer is explained, so a parent who is not sure of the answer can still help.
We measure how long things are using millimetres, centimetres, metres and kilometres. Your fingernail is about 1 centimetre wide. Your classroom is a few metres long. The road from Douala to Yaoundé is about 250 kilometres!
| Unit | Short form | About this big |
|---|---|---|
| Millimetre | mm | Thickness of a coin |
| Centimetre | cm | Width of your finger |
| Metre | m | Height of a door |
| Kilometre | km | Walking 15 minutes |
Weight tells us how heavy something is — we use grams and kilograms. A small tomato is about 100 grams. A big bag of rice is 25 kilograms. Capacity is how much a container can hold — we use litres. A small bottle of water is about half a litre.
| Measurement | Units |
|---|---|
| Length | mm, cm, m, km |
| Weight | g, kg |
| Capacity | ml, cl, dl, l |
1 kilometre = 1000 metres. 1 metre = 100 centimetres. 1 kilogram = 1000 grams. 1 litre = 1000 millilitres. Learning these helps you compare measurements!
| From | To | Multiply by |
|---|---|---|
| 1 km | metres | 1000 |
| 1 m | centimetres | 100 |
| 1 kg | grams | 1000 |
| 1 l | millilitres | 1000 |
How many centimetres are in 1 metre?
Write your answer, then check below.
Answer: 100
How many metres are in 1 kilometre?
Write your answer, then check below.
Answer: 1000
How many grams are in 1 kilogram?
Write your answer, then check below.
Answer: 1000
Which unit is best for measuring the length of a pencil?
Answer: B. centimetres
Which unit do we use to measure water in a bucket?
Answer: C. litres
Litres measure capacity (liquids).
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