5.1cm = 51mm
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There are 10 millimeters in 1 centimeter. 150 mm * (1 cm/10 mm) = 15 cm 150 millimeters is equal to 15 centimeters.
2000 millimeters is equal to 2 meters, the conversion is that 1 cm= 10mm and 1m=100cm.
To convert centimeters to millimeters, you multiply by 10 since there are 10 millimeters in a centimeter. Therefore, 68 cm is equal to 680 mm.
10 millimeters=1 centimeter
7.5 centimeters=75 millimeters