There are 10 millimeters to every 1 centimeter. So, there would be more millimeters in a given length than centimeters. To increase a number you would multiply.
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There are 10 millimeters in one centimeter. So if you wanted to convert centimeters into millimeters you would have to multiply the centimeters by 10. example: 40 centimeters * 10= 400 millimeters
centimeters
To convert centimeters to millimeters, you need to multiply by 10 since there are 10 millimeters in 1 centimeter. Therefore, a 12.0cm pencil would be 120.0mm long.
centimeters or millimeters
CM