Millimetre (mm): very small โ thickness of a credit card. Centimetre (cm): 10 mm = 1 cm โ width of a fingernail. Metre (m): 100 cm = 1 m โ height of a door handle from floor. Kilometre (km): 1000 m = 1 km โ distance between two bus stops. Which unit? Use mm for tiny things, cm for classroom objects, m for rooms, km for travel distances.
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