Cubic means ^3 (to the third power) or the number x the number x the number

1 cubic km = 1000 m^3 (1000 m x 1000 m x 1000 m)

1000 m^3 = 1 km^3 (1km x 1 km x 1km)

Multiply 1000 x 1000 x 1000

To convert cubic meters to cubic kilometers you must divide by the answer above.

To convert cubic kilometers to cubic meters you must multiply by answer above

Don't know third form.

1 cubic km = 1000 m^3 (1000 m x 1000 m x 1000 m)

1000 m^3 = 1 km^3 (1km x 1 km x 1km)

Multiply 1000 x 1000 x 1000

To convert cubic meters to cubic kilometers you must divide by the answer above.

To convert cubic kilometers to cubic meters you must multiply by answer above

Don't know third form.