420.
Get 450 to be safe.
35
5,290 Pieces
Depends on the size of the tiles.
It depends on the dimension used for measuring the tiles. Whether they are 12 in x 12 in or 12 cm x 12 cm will make a huge difference to the number of tiles required!
The answer will depend on the size of the tiles!
35
144 assuming no waste.
41
12 tiles by 18 tiles or 216 tiles total
144/(1.5*1.5) = 64 tiles, but if you are using this to determine how many are needed to tile a room, you need to add at least 10% for edging around the room. So, you probably need at least 71 or more 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.
You will need 25, 13x13 tiles.
291.43 tiles
To calculate how many 12x12 inch tiles are needed for an 8x9 foot room, first convert the room dimensions to inches: 8 feet = 96 inches and 9 feet = 108 inches. The area of the room is 96 inches × 108 inches = 10,368 square inches. Each 12x12 inch tile covers 144 square inches, so divide the total area by the tile area: 10,368 ÷ 144 = 72 tiles needed for the room.
A 13 x 13 tile is 1.74 sq ft. 144/1.74 = 123 tiles
176 tiles
1728