That's going to depend on the other dimension of the floor ... the one
that you've neglected to reveal ... and on the size of each tile.
In any case, here's a suggestion: You can fit a lot more of them on the floor
if you just leave them stacked in the cartons in which they're sold, rather than
putting them down in a single layer.
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2880 exactly, but if this is ceramic tiles you have to account for grout lines. extras would be recommended
144
There is 144 sq inches in a sq foot so 12 x 15 = 180 sq ft x 144 = 25920 / 81 (9 x 9) = 320 tiles. Be sure to buy extra for waste and mistakes...
A 13 x 13 tile is 1.74 sq ft. 144/1.74 = 123 tiles
440 sq feet = 440 x 144 sq inchesanswer = 440 x 144/ (20 x 20) = 440 x 144 /400 = 1.1 x 144 = 158.4 tiles ~ 159 tiles