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10 mm = 1 cm so 545 mm = 545/10 = 54.5 cm. Simple!
1 cm = 10 mm 2 cm = 20 mm . . 10 cm = 100 mm . . 15 cm = 150 mm
80 cm equals 800 mm.
There are 6.7 cm in 67 mm.
2100 mm = 210 cm
There are 0.18 cm in 1.8 mm.