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You'll need 200 18-inch tiles.

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Q: How many 18x18 square inch tiles will it take for 450 square feet?

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266.666666666 so rounding up 267 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.

2.25 square feet

5,184 2-square-inch tiles are needed.

875 24-inch tiles.

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220

22.2 tiles so buy 23 tiles.

266.666666666 so rounding up 267 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.

18" x 18" = 1.5' x 1.5' = 2.25 square feet90/2.25 = 40 tiles.

2.25 square feet

It depends on the units used for measuring the tiles. Obviously, the number of 18 inch x 18 inch tiles required will not be the same as 18 cm x 18 cm tiles. And if there were 18 yard x 18 yard tiles, you would need only 1.

5,184 2-square-inch tiles are needed.

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.

225 16-inch tiles.

875 24-inch tiles.

18 10x10-inch tiles.