40 mm
1 cm = 10 mm
1 mm = 0.1 cm
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There are 10 millimeters (mm) in one centimeter (cm). Therefore, 40 mm is equivalent to 4 cm.
There are 4 centimeters in 40 millimeters.
4 cm is equal to 40 mm. To convert centimeters to millimeters, you multiply by 10 since 1 cm is equal to 10 mm.
There are 4 millimeters more in 8.4 cm than 8 cm. This is because 8.4 cm is 84 mm and 8 cm is 80 mm, so the difference is 4 mm.
1 cm = 10 mm 2 cm = 20 mm . . 10 cm = 100 mm . . 15 cm = 150 mm