The prefix "kilo" means thousand; the prefix "milli" (not "milla") means 1/1000. If you divide that, you get a million millimeters in one kilometer.
3 centimetres = 30 millimetres, not millameters.
1 centimetre = 10 millimetres.
there are 10 mm = 1 cm
1 centimetre = 10 millimetres.
There are 1 centimetres in 10 millimetre, none in 10 millameters.
There are 304.8 millimeters in one foot.
1 centimetre equals 10 millimetres.
50mm = 5cm
None, since there are no such measures as millameters nor centameters. However, 12 millimetres equals 1.2 centimetres.
1 millimetre = 0.1 centimetre.
1 decimetre = 100 millimetres.
1 foot = 304.8 millimetres.