144 square feet. To calculate square feet simply multiply length by width - the result is the area in square feet.
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To determine the number of 12x12 inch tiles needed to cover 400 square feet, first calculate the area of one tile in square feet. Each tile covers 1 square foot (12 inches x 12 inches = 144 square inches = 1 square foot). Then divide the total area to be covered (400 square feet) by the area of one tile (1 square foot) to find the total number of tiles needed. In this case, it would take 400 tiles to cover 400 square feet with 12x12 inch tiles.
If you mean 12x12 "inches", then each tile covers 1 square foot. We trust you can take it from there.
You need 0.52, so about a half.because a single 12x12 tile has an area of 144.
144 square feet
12x12