0.0075 expressed in centimeters is 0.75 centimeters.
Mass is not expressed in kilometers (km). That is a measure of distance. Mass is expressed in units of kilograms (kg)
9000000 centimeters
50 km is equal to 5,000,000 centimeters.
There are 240,000 centimeters in 2.4 km.
If you mean 0.75 then it is 3/4 as a fraction in its simplest form
76.5 km x 1000 m/km x 100 cm/m = 7650000 centimeters
12.91 meters = 1,291 centimeters
7.2 kilometers = 720,000 centimeters.
253.8km is 25,380,000 centimeters.
1 kilometer = 100,000 centimeters
km x 100,000 = cm1 km = 100,000 cm