Ten million
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25 mm = 2.5*10-5 km
10 mm = 1 cm 100 cm = 1 m 1000 m = 1 km So 1 x 1000 x 100 x 10 = 1000000 mm.
251 cm = 251 x 10 mm = 2,510 mm 561097 mm = 561097/1,000,000 km = 0.561097 km
0.1 km
1000 mm = 1 m 1000 m = 1 km ⇒ 1000 x 1000 mm = 1 km ⇒ 1000000 mm = 1 km Therefore to convert 10 mm to km divide by 1000000 (a million).