There are 10 millimetres in every 1 centimetre. The reason for this is that centi means 1/100 and milli means 1/1000 according to the SI prefixes. 0.001/0.01 gives 10.
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0.01m= 1 cm 1cm=10mm
There are 10mm in 1cm. Therefore there are 102mm2 in 1cm2 which equals 100 square millimetres.
1cm = 10mm ⇒ 18.7cm = 18.7 x 10mm = 187mm
There are 10mm in a cm. However, when talking about the area, the units are squared, and so too is the difference between cm and mm. 10x10 is 100, which is the conversion factor. 1cm^2 is 100mm^2.
There are 1000 millimetres in a metre, and 100 centimetres in a metre. So 1cm is the same as 10mm. So 4cm 40mm.