1 cm = 10 mm
⇒ 4 cm = 4 x 10 mm
= 40 mm
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40 mm
0.4cm
1 cm = 10 mm so 4 cm = 40 mm. Simple!
4 centimeters (4cm) is 40 mm (millimeters), which is around 2 inches.
The idea is to convert everything to the same unit - for instance, convert the cm to mm. Then you can easily subtract.