One 12x12 tile is one square foot. So, assuming everything works perfectly (it won't, depends on the geometry of the room/space) it will take 450 tiles to cover 450 square feet. If the room doesn't have even foot dimensions (10X12, etc) you will need to cut some tiles. It's best to estimate 10-15% waste, so order 500-525 tiles.
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395 tiles
350.
12 x 12 tiles cover 144 ft2, so the number of tiles needed is 1800/144, which equals 12.5.
Depends on the size of the tiles.
2400 tiles if you don't get any extra