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Convert units of length
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Learn it 1 cm = 10 mm, 1 m = 100 cm, 1 km = 1,000 m. Big unit → small unit: multiply. Small unit → big unit: divide.
Example: Change 3 km 450 m to metres, and 2,500 mm to metres.
- 3 km = 3,000 m, so 3 km 450 m = 3,450 m.
- 1 m = 1,000 mm, so 2,500 mm = $2{,}500 \div 1{,}000$ = 2.5 m.
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