Meter is the standard unit of length. One meter is equal to the value of 100 centimeters and one centimeter is equal to 10 millimeters. So 4mm is equal to 4*10 TO THE POWER -3
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Two millimeters is twice as thin as four millimeters.
3 metres are in 3,000 millimeters.
20 millimeters=0.02 meters
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30mm