divide by 1,000
40/1,000 = 0.04
40mm = 0.04 metres
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40mm is 4cm. There are 100cm in a meter.
There are 4 centimeters in 40mm - 10mm per centimeter.
4cm of course !
1in = 2.54cm 1cm = 10mm 40mm x 1cm/10mm x 1in/2.54cm = 1.57in
0.4cm