39cm equates to 390mm (there are 10mm per cm).
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39 millimeters is 3.9 centimeters.
150 millimeters is equal to 15 centimeters.
1 centimeters = 10 millimeters; so 130 millimeters is 13 centimeters
190 millimeters is equal to 19 centimeters. To convert millimeters to centimeters, you divide by 10.
3,000 centimeters is 30,000 millimeters.