The amount of tiles needed to cover a floor will depend on the size of the floor.
240 square tiles are needed
6' x 9' (54 square feet) = 6 square yards of tiles needed.
It should take about 825 1 foot square tiles to cover a floor with those dimensions. This assumes roughly a 10% waste factor.
157 18 by 18 tiles are needed to cover 352 square feet.
you need to know how wide the floor is in addition to how long. Number of tiles is lenght x width
5,184 2-square-inch tiles are needed.