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When we measure the weight or size of something, we use standard units of measurement. This allows us to compare the weights or sizes of different objects. Because some things are very small, and others are very big, we tend to describe them using different measuring words. For example, we would measure the length of our fingernail in millimetres and our finger in centimetres. We would probably measure the width of a river in metres, but measure its length in kilometres. All of the units of measurement we use are related to each other, and here’s a quick guide showing you how. Can you think of things we would measure using each of these units of measurement?
Size or distance
10 millimetres (mm) = 1 centimetre (cm)
100 centimetres = 1 metre (m)
1000 metres = 1 kilometre (km)
Weight
1000 milligrams (mg) = 1 gram (g)
1000 grams = 1 kilogram (kg)
1000 kilograms = 1 metric ton (t)
Quantity of liquid
1000 millilitres (ml) = 1 litre (l)
1000 litres = 1 cubic metre (m3)
Area
10,000 square metres (m2) = 1 hectare (ha)
100 hectares = 1 square kilometer (km2)