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.
Assuming you mean 16x16 inches tiles... 441 tiles would cover the area exactly
297 16x16-inch tiles.
102
125 16-inch tiles.
675 of them. Get extra for breakage.
Assuming you mean 16x16 inches tiles... 441 tiles would cover the area exactly
.375
297 16x16-inch tiles.
74.57
102
You would have 79 tiles.
150 16x16" tiles; you'll have a small part of one tile left over.
125 16-inch tiles.
You would need 137 (136.23) 16" x 16" tiles to cover 22.5 square meters.
675 of them. Get extra for breakage.
141
64 nos tiles is required calculation is