There are 30 millimetres in 3cm
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There are 32 millimetres in 3 centimetres 2 millimetres.
There are ten millimetres in one centimetre.
5.1 cm
82 cm
10 millimetres = 1 centimetre so 30 mm = 30/10 = 3 cm. Simple!10 millimetres = 1 centimetre so 30 mm = 30/10 = 3 cm. Simple!10 millimetres = 1 centimetre so 30 mm = 30/10 = 3 cm. Simple!10 millimetres = 1 centimetre so 30 mm = 30/10 = 3 cm. Simple!