There are ten millimeters in a centimeter, so all you have to do is divide 40 by 10, which equals 4.
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300 milimeters
4 meters is 40 dm (decimeters), yes More popular use is of 400 cm centimeters or 4000 mm (milimeters)
0.5 centimeters or 5 milimeters
25 millimeters
40 mm = 4 cm