One 12' x 12' cover will cover 144 square feet, so just one but you might have to cut it.
1080 will be your answer
35
40. Each is a square foot.
12 in*12 in = 1 sq foot. 10 ft * 10 ft = 100 sq feet so 100 tiles would be needed - assuming no wastage.
Assuming none are broken during the installation process, 64 full tiles will be required.
Assuming the tiles are 1 foot squares, you would need 10*15 = 150 tiles.
18..
144
240 square tiles are needed
6
-3.5
It should take about 825 1 foot square tiles to cover a floor with those dimensions. This assumes roughly a 10% waste factor.
In practice you will use more tiles than the equivalent area of the room. A 15 foot strip of tiles will require 15 times 12/13 = 13.846 tiles to cover it. This will have to be rounded to 14 tiles. That means that the 15 foot by 15 foot room will require 14 times 14 tiles = 196 tiles to cover it. And that's if you don't drop and break any or mess up one or more cuts.
you need to know how wide the floor is in addition to how long. Number of tiles is lenght x width
12 " x 12 " = 1 foot by 1 foot = 1 sq foot. 900 / 1 = 900 tiles are needed (plus waste).
18*18 = 324 tiles.