700 sq ft = 700*12*12 = 100800 sq inches
16*16 sq inches = 256 sq inches
So number of tiles = 100800/256 = 393.75
If this is for real, rather than a maths sum, allow for the fact that the shape you are tiling may not correspond to a whole number of tiles along its length or breadth and also for breakages.
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Each 16 inch tile is 1.78 square feet. You would need 169 tiles, plus some for spoilage.
Two tiles of 16 ft*16 ft will cover 512 square feet.
4 square feet are needed
144 square inches make one square foot Each square inch is 0.006944 of one square foot. (rounded)
500 sq ft = 500*12*12 = 500*144 = 72000 sq inches You would need 72000/256 tiles of 16*16 sq inch ie 281.25 tiles. The above answer is good only for mathematical purposes. In real life, you would need to take account of the shape of the area and also make an allowance for wastage.