Convert 4200 square meters with a thickness of 2cm to cubic meters?

Convert 4200 square meters with a thickness of 2cm to cubic meters?
Im not sure if that answer is correct. I tried working this out and I think it goes like this: 4200 square meters should be multipiled with the thickness 0.02 meters (2cms = 0.02m) Therefore, the cubic meter should be 84 cbm. Someone pls confirm if this correct.EDIT: lets start by putting everything in the same unit (CM): this gives us 420000 (sq area) x 2 (depth): this is a simple volume of a square equation: L x W x D = 840000 cm3 which is 84 m3. my first attempt was wrong, sorry. and you were correct.EDIT:thanks for the help.