2.25 square feet
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I will not explain exactly how to tile but i will tell you that your floor has to be very flat, an 18" tile is harder to install when there are crowns in floor they are not as forgiving as a 12 or 13" tile and you will have unacceptable lippage in your 18" tile, for installing go to john bridges website.
A 24" by 18" tile is 432 square inches or three square feet.
1/3 x 3/2 = 3/6 Half a square foot
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.