It's 15 cm because an cm is 1/100 of a meter and an mm is 1/1000 of a meter
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There are 15 centimeters in 150 millimeters. This is because one centimeter is equal to 10 millimeters, so to convert millimeters to centimeters, you divide by 10.
1.5 cm equals 15 mm.
1 cm = 10 mm 2 cm = 20 mm . . 10 cm = 100 mm . . 15 cm = 150 mm
150 centimeters = 15 decimeters
1.5 cm is equal to 15 mm. To convert centimeters to millimeters, you multiply by 10 since there are 10 millimeters in 1 centimeter.
15 centimeters is 150 millimeters.