1 centimetre = 10 millimetres so 30 cm = 30*10 = 300 mm. Simple!
It is 15 millimetres.
23.6 millimetres
There are 10 millimetres in one centimetre. Therefore, 20.4 centimeters is equal to 20.4 x 10 = 204 millimetres.
There are 10 millimetres in one centimetre. Therefore, 16.2 centimeters is equal to 16.2 x 10 = 162 millimetres.
102 millimetres is 10.2 centimeters (0.102 metres) 10 millimetres = 1 centimetre 100 centimeters = 1 metre (1000 millimetres = 1 metre)
5.8 centimetres = 58 millimetres
800 millimetres = 80 centimetres
100 centimetres is 1,000 millimetres.
7.2 centimetres = 72 millimetres
60 millimetres in 6 centimetres
12.5 centimetres are in 125 millimetres.