Two tiles should be sufficient!
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60
It will take 60 tiles. However the last row and the last column will only consist of partial tiles and have to be cut.. show lens
Well, 60, assuming the space was exactly x feet by y feet. Since it probably isn't, you'll need some extra for partials and waste, so figure about 70-75 to be safe.
60 square feet = 60*12*12 = sq inches. Therefore, minimum number of tiles required = 60*12*12/(18*18) = 26.66... ie 27 tiles. That is the classroom answer to the mathematical question. However, in real life, the area to be covered may not be of a shape in which whole tiles can be used. In that case, unless you can use all the offcuts you will require more tiles.
60 square feet would be 60 one foot square tiles. Get 5 or 6 extra for breakage.