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10 mm = 1 cm so 9 mm = 9/10 cm = 0.9 cm. Simple!
511 cm equals 511 centimetres.
7.4 meters equals 740 cm.
4.6 centimetres equals exactly 4.6 cm.
30 cm
320 cm.
0.9 cm
it is equivalent to 140mm
.013 cm
10 cm
50 cm
13 cm
31 in = 78.74 cm