If it's 12"x12", each one is a square foot, meaning they'd cover 40 square feet.
But if it's 12'x12', each one is a ridiculous 144 square feet, which would mean they'd cover 5760 square feet.
Units of measurement are important.
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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.