Compare 40 cm to 40 mm.

1 meter has 100 centimeters (1 m = 100 cm) and 1000 milimeters (1 m = 1000 mm),1 centimeter has 10 millimeters (1 cm = 10 mm). Therefore, we can say that 40 cm is greater than 40 mm.

If we want to convert 40 cm to mm, we must multiply by 10:

40 cm to mm = 400 mm

If we want to convert 40 mm to cm, we must divide by 10:

40 mm to cm = 4 cm