144 square feet
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If it's a 12'X12' room then it's 144 sq. ft.
None. It can be written in square inches though. To convert square feet to square inches, multiply by 144 (one square foot is 12x12 square inches).
So each tile is 12" by 12" square, right? So each tile is ONE square foot? (a perfect square that's a foot long and a foot wide). Each tile is one square foot and you need to know how many add up to 400 square feet. I think the answer is the square root of Pi.
12" x 12" = 1 square foot To cover 500 square feet requires 500 of them, plus some extra in case you crack or chip a few.
Another name for 12x12 is the product of 12 and 12, which equals 144. In mathematical terms, this is known as the square of 12, or 12 squared. The square of a number is the result of multiplying the number by itself.