You don't... not really...
A centimeter is a unit of length and a milliliter is a unit of volume. However, just as the volume of a cube is the length of a side cube, a milliliter is equal to a cubic centimeter.
1 mL = 1 cm3
I dont think you can ask Google
10 Milimeters = 1 cm
therefore 1 mm = 0.1 cm
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