1 km = 1000 m
⇒ 5.1 km = 5.1 x 1000 m
= 5100 m
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1 km = 1,000 m 2 km = 2,000 m 3 km = 3,000 m . . . 51 km = 51,000 m 51.42 km = 51,420 m
1 km = 1000 m so 0.001 km = 1 m
1 km = 1000 m, so 7.9 m = 0.0079 km
2,100 m
2.5 m = 0.0025 km