A 24" by 18" tile is 432 square inches or three square feet.
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There are 144 18 square inch tiles in an area of 18 square feet.
If each tile is 1 1/2 feet by 1 1/2 feet, use the decimal equivalent to do the math: 1.5 x 1.5 = 2.25 square feet.
There are 1.5 times 3 = 4.5 square feet in an 18 inch by 36 inch tile. 18 inches = 1.5 feet (since there are 12 inches in a foot). 36 inches is 3 feet. The area of a rectangular tile is the width x height, so 1.5 x 3 = 4.5 square feet.
2.25 square feet
Floor area = 12 ft x 18 ft = 216 square feet. There are 4 six-inch square tiles needed for each square foot, so 864 tiles are needed.