A physics question i do not understand Please help

[mynameistessa]

Homework Statement

The floor of a room measures 6.0 m x 4.0 m. Calculate its area in m^2, cm^2 and mm^2. The room height is 3.0. Calculate its volume in m^3, cm^3 and mm^3.

Homework Equations

centi = 10^-2
milli = 10^-3

The Attempt at a Solution

To get it into cm^2 and mm^3 i tried multiplying the numbers by the value of centi and milli but this is wrong. Please could you show me how to do it and explain why :D
Thank you so much! x

 

[daveb]

If 100 centimeter = 1 meter, then the ratio 100cm/1m = 1, correct? What happens if you square both sides?