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Easy: m to cm, cm to mm
A larger unit is worth many smaller ones: 1 m = 100 cm, 1 km = 1000 m, 1 kg = 1000 g and 1 L = 1000 mL. To convert to the smaller unit, multiply; for a mixed measure, convert the large part and add the small part.
Convert to the smaller unit.
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Change the metres to centimetres and add the rest: 3 m = 300 cm, so 3 m 45 cm = 345 cm.
A smaller unit fits more times into the same length, so the number gets bigger. 1 km is 1,000 m, so 4 km is 4 × 1,000 = 4,000 m.
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