How many millimeters is 3.21 centimeters?

Answer 1

Remember K H D | d c m (kilo, hecto, deka, (liter, meter, gram), deci, centi, milli). Millimeters are one place to the right of centimeters. So you have to move the decimal place once to the right. You will get 3.21 cm = 32.1 mm.

Answer 2

to change from centimeter to millimeter multiply by ten

to change from millimeter to centimeter divide by ten

so 2.1 mm is 0.21 cm

hope that helps