First, find the square footage of an 16" x 16" tile. 16 x 16 = 256 square inches. There are 144 square inches in a square foot (12" x 12" = 144). So divide 256 by 144 to get the square feet per tile. 324 / 144 = 1.78 sq ft per tile.
You have 270 square feet, using tiles that are 1.78 sq ft each. 270 / 1.78 = 151.7 tiles.
Generally, you will want to add from 5% to 10% for waste, depending on your layout (is it one big room, or several smaller rooms with lots of cutting?) (are you doing a checkerboard pattern, running bond (brick), or diagonal?) and your skill level. If in doubt, add 10% to be safe.
152 tiles + 10% --- that's 152 x 1.1 = 166.9 tiles.
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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.