By unit of length and distance and conversion ,we can say that
1 m =0.03930 in
420 mm=16.53 in
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16.54 in.
1 mm = 0.03937 inch Multiply your numbers by that to convert them.
420mm is bigger.
There are 10 mm to a cm so just times the number by ten, so 420mm = 4.2cm :)
There are 10 millimetres in one centimetre. Therefore, 420 millimetres is equal to 420/10 = 42 centimetres.