math
posted by makeeda .
Convert → 678,000 cm = ____ km.
Choose the best answer from the options below:
A 5.78 km
B 6.78 km
C 67.8 km
D 678 km

math 
MathMate
1 m = 100 cm:
To convert cm to m, divide by a hundred (or move the decimal point two places to the left).
1 km = 1000 m:
To convert m to km, divide by a 1000, or move the decimal point three places to the left.
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