10
67 tiles.
It is not clear what is meant by an "18x18 square feet" tile. 18ft * 18 ft = 324 square feet, so that one tile will be more than enough. An 18 inch by 18 inch tile cannot be a 18x18 square feet tile.
288
The answer will depend on the units used for measuring the tiles which you have failed to specify.
3
67 tiles.
start with 38 tiles.
192 tiles
It is not clear what is meant by an "18x18 square feet" tile. 18ft * 18 ft = 324 square feet, so that one tile will be more than enough. An 18 inch by 18 inch tile cannot be a 18x18 square feet tile.
118
288
12...
The answer will depend on the units used for measuring the tiles which you have failed to specify.
18" x 18" = 1.5' x 1.5' = 2.25 square feet90/2.25 = 40 tiles.
To calculate the number of 18x18 ceramic tiles needed for a 12x12 room, first determine the area of the room and the area of one tile. The area of the room is 144 square feet (12x12), and the area of one tile is 2.25 square feet (1.5x1.5). Dividing the room area by the tile area, you'll need about 64 tiles (144 ÷ 2.25). It's advisable to purchase a few extra tiles to account for cuts and breakage.
The answer depends on the measurement units used for 18x18.
22.2 tiles so buy 23 tiles.