You can do one of the following to calculate this:
1) Convert inches to feet. Then multiply to get the area in square feet.
2) Multiply first, to get the area, but this time in square inches. Divide the square inches by 144 to convert to square feet.
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2.25 square feet
4,800 6-inch square tiles.
It is not clear what is meant by an "18x18 square feet" tile. 18ft * 18 ft = 324 square feet, so that one tile will be more than enough. An 18 inch by 18 inch tile cannot be a 18x18 square feet tile.
67.5
440 6-inch square tiles.