6.3 cm is equal to 63 mm. In 1 cm there are 10 mm.
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Each CM is made of 10 mm. You simply move the decimal point one space to your right to express CM in MM.
So 6.3 becomes 63.0
64 cm is greater than 630 mm which equals 63 cm
80 cm equals 800 mm.
That is two millimeters.Ten mm equals to 1 cm
1.5 cm equals 15 mm.
630 mm = 630/10 = 63 cm