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there are 10 millimetres in 1 cm so there are 1.2 x 10 millimmetres in 1.2 com= 12 millimetres
It is: 1/10 cm = 1 mm
The 100 centimetres in 1 metre. There are 10 millimetres to the centimetre and 1000 millimetres to the metre.
10 mm = 1 cm 65 mm = 6.5 cm
10 millimetres = 1 centimetre so 6.5 mm = 6.5/10 cm = 0.65 cm. Simple!