If that measurement is in inches, I suggest you (1) convert inches to feet, (2) multiply length x width to get square feet, and finally (3) divide the total area by the area of one tile.
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Tiles that are two feet on a side cover 4 square feet. 378 of them cover 1512 square feet.
76.6 tiles
67 tiles.
157 18 by 18 tiles are needed to cover 352 square feet.
You will need at least 67 tiles. This will cover 150.75 square feet.