The answer depends on the dimensions used for 8x8. For example, an 8 inch x 8 inch tile will have a different area to an 8 cm x 8 cm tile.
The area of each tile is 16*16 sq inches = 1.77... square feet. To cover a 200 square foot square will require 200/1.77... = 112.50 = 113 tiles.
1.78 square feet
1 sq foot = 144 sq inch tile area is 14 x 14 sq inch answer = 32 x 144 / (14 x 14) tiles
16x16 square feet = 256 square feet, so two tiles will suffice.
1.78 sq feet per tile.
A square 20-inch tile is 2.78 square feet.
2.25 square feet
This tile has an area of 1 ft2.
1.78 square feet.
4,800 6-inch square tiles.
There are 144 18 square inch tiles in an area of 18 square feet.
It is not clear what is meant by an "18x18 square feet" tile. 18ft * 18 ft = 324 square feet, so that one tile will be more than enough. An 18 inch by 18 inch tile cannot be a 18x18 square feet tile.
1.78 square feet.
67.5
Approximately 96 square feet.
2.007 sq ft