30 millimeters
3 millimetres = 0.3 centimetres.
0.42 centimeters.
80mm = 8cm
5.5cm = 55mm
There are 1000 millimetres in 100 centimetres.
25 centimetres = 250 millimetres.
10 centimetres 100 millimetres.
250
189 millimeters is 18.9 centimeters.
14 centimeters=140 millimeters
You will have to divide by 10 So 15mm = 1.5cm
65 millimetres is greater.