You will need a minimum of 136 18" x 18" tiles but buy a few extra to account for breakage, etc.
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.
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.
You may want to use a calculator. 18 in x 18 in =? square inches There are 144 square inches in a square foot. Divide the square inches in one tile by 144. That should equal about 2.25 square feet per tile. 425 divided by the square feet in one tile -- that would give you the number of tiles. It would take about 189 tiles.
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