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There are 30 millimetres in 3cm
There are 100 cm (centimetres) in 1 m (metre).
There are ten millimetres in one centimetre.
12.5 centimetres are in 125 millimetres.
There are 10 millimetres in one centimetre. Therefore, 100 millimetres is equal to 100/10 = 10 centimetres.