Two tiles of size 12 ft x 12 ft will cover 288 square feet and so should be sufficient.
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A A 12x12 sq feet tile covers 144 sq feet. So to cover 1200 sq feet you will need 1200/144 = 8.3 or 9 tiles.
If the tiles are 12 inches square... 8352 tiles ! However if they're 12 feet square... 58 tiles
12" x 12" = 1 square foot. 99 of them will cover 99 square feet.