There are ten millimetres in one centimetre.
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There are 30 millimetres in 3cm
There are 32 millimetres in 3 centimetres 2 millimetres.
5.1 cm
82 cm
there are 10 millimetres in each centimetre. so 10x1,000,000 gives 10,000,000mm in 1,000,000 cm.