13 boxes with 13 tiles in each
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
About 100 but that depends on the shape of the 80 sq ft surface being covered and whether you are willing to cut the tiles several times or not. 100*13*9=11700 sq in 80*144=11520 sq in so you don't even have two tiles over if the shape were perfect for the tiles.
8 square meters equals 8 x 100 x 100 square centimeters. That is 80000 square centimeters. A 13cm square has an area of 13 x 13 = 169 square centimeters. Therefore the number of tiles required is 80000/169 = 473.37, make it 474
13 in is 1.0833 ft. 1.08332 is 1.174feet squared per tile. 27/1.174 is 23 tiles, give or take a small decimal. Depending on the length compared to width you will likely need to split tiles to have 23 tiles do the job
13 boxes with 13 tiles in each
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
You will need approximately 23.4 tiles, so 24 tiles. Assuming 13x13 tiles is in inches.
It depends on the size of the tiles and also, to some extent, on the shape of the area that you need to cover.
23 tiles if you want to add for waste it would be 26.
About 100 but that depends on the shape of the 80 sq ft surface being covered and whether you are willing to cut the tiles several times or not. 100*13*9=11700 sq in 80*144=11520 sq in so you don't even have two tiles over if the shape were perfect for the tiles.
If the tiles are 13 in square, an unusual size, there will be 16 one way and 14 the other (ignoring fractions of a tile) so you need 224 tiles.
10" * 13" = 130 sq inches = 130/144 = 0.9028 sq ft. Area to be covered = 100 square feet so tiles required = 100/0.9028 = 110.77 tiles ie 118 tiles. That is the mathematical answer. In real life, though, the answer will also depend on how "well behaved" the area to be covered is. If it has lots of awkward corners or curves, you will need to cut more tiles to shape and, unless you are able to use all such offcuts, you will require more tiles.
8 square meters equals 8 x 100 x 100 square centimeters. That is 80000 square centimeters. A 13cm square has an area of 13 x 13 = 169 square centimeters. Therefore the number of tiles required is 80000/169 = 473.37, make it 474
Depends on the size of the tiles.
Assuming the 9" x 9" tiles have patterns with obvious edges (so you only want to join them edge-to-edge), and assuming the 100 square feet is in fact a square (10' x 10', or 120" x 120"), then you'll need 183 tiles to cover it. You'll make a square starting in one corner, 13 rows of 13 whole tiles each. That's 169 tiles (and 13 x 9" = 117"). That will leave a 3" wide strip along the two edges and opposite corner of your square. Take 13 more tiles and cut them into thirds (as 3" strips), discarding the middles. Use half of those ⅓-width tiles along one edge of your square, and the other half along the other edge. That's 182 tiles — and then you cut a 3" x 3" square off your last tile, to finish the corner of your area. Note: If you don't care about joining the tiles only at their edges, then you only need 178 tiles.
13 in is 1.0833 ft. 1.08332 is 1.174feet squared per tile. 27/1.174 is 23 tiles, give or take a small decimal. Depending on the length compared to width you will likely need to split tiles to have 23 tiles do the job