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The beauty of metric system is that it is decimal. 0.51cm = 5.1mm
100 mm
304.8 mm
304.8 mm in a foot
2450 mm
2
10 mm = 1cm 1 in = 2.54 cm 1 in = 25.4 mm
90 mm
16.5 mm
8500 mm
135 mm.
6450 mm
153 mm
760 mm
50.8 mm
1290 mm