157 18 by 18 tiles are needed to cover 352 square feet.
6' x 9' (54 square feet) = 6 square yards of tiles needed.
240 square tiles are needed
5,184 2-square-inch tiles are needed.
236 18-inch tiles.
1540
18..
647
968
Each tile covers 4 square feet. Which means you need 200 tiles to cover 800 square feet, plus spoilage.
616 3x6 inch tiles are needed to cover exactly 77 square feet.
Tiles that are two feet on a side cover 4 square feet. 378 of them cover 1512 square feet.