You will need 44 six inch tiles to cover 11 square feet.
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*6=30*12=360/4=90 tiles
236 18-inch tiles.
It would be 9 tiles wide by 12 tiles long. That gives you a total of 108 tiles.
You'd take 5ft x 5ft which will give you 25 square feet. Since you're talking about 12" tiles (1ft square) you'd need at minimum 25 tiles to cover your area.
5,184 2-square-inch tiles are needed.
128.2 tiles
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400 6" x 6" tiles are needed.
About 197 (196.875) 16" x 16" tiles will feet in that area.
1120 plus 10% for salvage= roughly1230tiles. you can probably return unused tiles
22.2 tiles so buy 23 tiles.