Allowing for a normal 1/4 inch grout between the tiles, 25.
6' x 9' (54 square feet) = 6 square yards of tiles needed.
56 16x16" tiles are needed.
240 square tiles are needed
22.2 tiles so buy 23 tiles.
Floor area = 12 ft x 18 ft = 216 square feet. There are 4 six-inch square tiles needed for each square foot, so 864 tiles are needed.
5,184 2-square-inch tiles are needed.
236 18-inch tiles.
Four tiles are needed.
157 18 by 18 tiles are needed to cover 352 square feet.
266.666666666 so rounding up 267 tiles.
If the tiles are 12 inches square... 8352 tiles ! However if they're 12 feet square... 58 tiles
968