It depends on whether they are 12 cm x 12 cm tiles or 12 inch x 12 inch tiles or some other, unspecified, measure.
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2400 tiles if you don't get any extra
If the tiles are 12 inches square... 8352 tiles ! However if they're 12 feet square... 58 tiles
If they are 12 inches x 12 inches then you would need 399 tiles.
320
12 x 12 tiles cover 144 ft2, so the number of tiles needed is 1800/144, which equals 12.5.