To cover 345 square feet with 16x16 tiles , you need at least 195 tiles (194 and 1/16 exactly).
345 square feet x 144 square inches/sq ft = 49680 square inches
16 x 16 = 256 square inches per tile
49680 / 256 = 194.0625
It could take more because you may have to use large fractional tiles on edges, and some may break.
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Assuming you mean 16x16 inches tiles... 441 tiles would cover the area exactly
297 16x16-inch tiles.
102
125 16-inch tiles.
141