12" x 12" = 1 square foot.
99 of them will cover 99 square feet.
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If the tiles are 12 inches square... 8352 tiles ! However if they're 12 feet square... 58 tiles
A 12x12 tile is 1 sq foot, so you will need 198 tiles.
15012*12=144 square inches150 square feet =21600 square inches21600/144=150