1km = 1,000,000mm
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Think logically.
1 000 m = 1 km
There are 10 mm in 1 cm, and 100 cm in 1 m.
So, in 1 m, there are 1 000 mm.
Multiply this by 1 000, and you will get: 1 000² = 1 000 000
So, in 1 km, there are 1 000 000 mm.
1000, since "milli" means 1/1000.
1 kilometer = 1000 meters 137000 milimeters = 137 metrers
1 kilometer=100,000 centimeters
1 kilometer=100,000 centimeters
1 km = 105 cm