What is the number of tiles needed to cover a rectangular floor given diagram?

Question

A square tile measures 6 inches by 6 inches. What is the least number of tiles needed to cover a rectangular floor area of 9 feet by 12 feet?

So the first thing i tried to do was divide 9 by 6 and then 12/6 and then multiply them together. That gave me 3 which wasn't the right answer. how do you solve this?

Answer 1

As there seem to be 12 inches per foot, you can easily cover a square of side length one foot with four tiles. As the given rectangle can readily be partitioned into $9\cdot 12=108$ such squares, you need $4\cdot 108=432$ tiles.

Answer 2

Two tiles will have a side length of one foot. So we need 18 in vertical and 24 in horizonstal direction, which makes $18\cdot 24 = 432$ tiles.