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The kilo- prefix means 1,000

The milli- prefix means 1/1000

→ 1 mm = 1/1000 m

→ 1,000 mm = 1 m

1 km = 1,000 m = 1,000 × 1,000 mm = 1,000,000 mm

→ ½ km = 0.5 × 1,000,000 mm = 500,000 mm

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