One square foot is 12 inches by 12 inches = 144 in2
290 ft2 is 41,760 in2 [multiply 290 * 144]
One tile is 256 in2 [multiply 16*16]
So, dividing the tile in2 into the floor in2 [41,760/256] we get a total of 163.125 tiles - say 164 because you cannot by an eighth of a tile.
However, two "real life" factors must be accounted for:
1. I have never tiled a floor where I was not very glad that I purchased 10% more than I needed.
2. Our total may already be greater than needed because we did not take into account the grout lines.
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297 16x16-inch tiles.
205.3125 tiles exactly OR 206 tiles, with a bit left over!
125 16-inch tiles.
16 inch x 16 inch = 16x16/144 = 1.777777.... sq.ft. 450/1.777777..... = 253.125 tiles (not counting any wastage caused by cutting, breakage, etc) = 254 tiles minimum.
First I would convert 16x16 inch tiles in feet 16x16 inch tiles = 1.25x1.25 feet tiles To calculate the square feet that one tile takes up multiply 1.25 x 1.25 1.25 x 1.25 = 1.5625 sq feet Now calculate 190/1.5625 to find the number of tiles that can fit in 190 square feet 190/1.5625 = 121.6 You will need 121-122 square tiles