18 cm = 180 mm.
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in 1000 cms there are 10000 mms
900 mms equals 90 cms divide mms by 10 for cms
There are 85 mms in 8 and a half cms.
One inch is 2.54 cms or 254 mms 12 inches in a foot, so one foot is 30.48cms or 3048 mms.
There are 10 mms per cm, so multiply centimeters by ten to get millimeters. Or divide by 0.1. In this case, 4 cms = 40 mms.