1 cm = 10 mm
640 mm/ 10 = 64 cm
your answer: 640 mm is 64 cm
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10 mm = 1 cm so 6400 mm = 6400/10 = 640 cm
10 mm = 1 centimeter 40 mm = 4 centimeters 400 mm = 40 centimeters 490 mm = 49 centimeters
92 mm = 9,2 centimeters
There are ten mm in a cm. The answer would be 4 centimeters.
It is about 25 inches