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The metric system is used to measure the length, weight or volume of an object.

Length is measured in millimetres (mm), centimetres (cm), metres (m) or kilometres (km).

• 1 cm = 10 mm
• 1 m = 100 cm
• 1 km = 1000 m
• 1 cm is about the width of a staple
• 1 m is about the width of a single bed

Weight is measured in grams (g) and kilograms (kg). Volume is measured in millilitres (ml) and litres (l).

• 1 kg = 1000 g
• 1 l = 1000 ml
• 1 kg is the weight of seven apples
• 1 l is the volume of a carton of orange juice