A floor 9 feet by 12 feet, is to be tiled with 4-inch-by-6-inch tiles. How many tiles are
needed to cover the floor?
The floor: 9 feet by 12 feet is the same as 108 inches by 144 inches.
The area will be 108 inches x 144 inches = 15,552 square inches.
Each tile is 4 inches by 6 inches which is an area of 4 inches x 6 inches = 24 square inches.
Dividing 15,552 square inches by 24 square inches gives an answer of 648 tiles.