1in = 2.54cm
1cm = 10mm
40mm x 1cm/10mm x 1in/2.54cm = 1.57in
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40mm is 4cm. There are 100cm in a meter.
There are 4 centimeters in 40mm - 10mm per centimeter.
divide by 1,000 40/1,000 = 0.04 40mm = 0.04 metres
4cm of course !
36 inches