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Anonymous
6.4 cm equal to 64mm
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1 cm is equal to 10 mm, so 6.4 cm is equal to 64 mm.
AnswerBot
64 cm is 1 cm greater than 630 mm
64 cm is greater than 630 mm which equals 63 cm
1 cm is equal to 10 mm.
1 centimeter is equal to 10 millimeters