13 x 13 (assumed inches) is 13/12 feet x 13/12 feet, so the area of one tile is 169/144 square feet. To cover 100 square feet you need (100)/(169/144) tiles which works out to (100 x 144)/169 = 14400/169 = 85.2, make it 86 tiles
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16 square feet with less than one square foot of tile remaining
One 13 ft x 13 ft tile covers 169 square feet, so 2 will be enough.
the dimensions of one tile is 13x13 inches or 1.083x1.083 feet. Therefore area of one tile is 1.1736 square feet and that of 196 tiles is 196x1.1736=230.027
Tiles that are two feet on a side cover 4 square feet. 378 of them cover 1512 square feet.
Area of each tile = 13x13 sq inches = 1.1736111... sq feet. So number of tiles required = 200/1.1736111... = 170.4 tiles. So, the mathematical answer is that you will require a minimum of 171 tiles. Im real life, however, you should have an extra 5% to allow for breakages, dealing with awkward corners or curves, etc.