There are 10 millimetres in one centimetre. Therefore, 2 millimetres is equal to 2/10 = 0.2 centimetres.
There are 1000 millimeters in one meter. Therefore, 2 millimeters is equal to 2/1000 = 0.002 meters.
A millimetre is a unit of distance. A gram is a unit of mass. The two units are therefore incompatible.
There are 304.8 millimetres in one foot. Therefore, rounded to three significant figures, 2 millimetres is equal to 2/304.8 = 0.0526 feet.
There are 25.4 millimetres in one inch. Therefore, 2 inches is equal to 25.4 x 2 = 50.8 millimetres.