A centimetre is one hundredth of a metre, so 3cm is 0,03m.
300m would be 3 hectometres, but no-one really uses hectometres. The divisions used in the metric system stick to thousands. millimetres and kilometres.
2.04 meters
9,000 centimeters.
1.4 meters=140 centimeters
Not sure about centermeters, but 3 inches = 7.6 centimetres.
1 meter and 43 centermeters 1.43 meters