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You may want to use a calculator.

18 in x 18 in =? square inches

There are 144 square inches in a square foot.

Divide the square inches in one tile by 144. That should equal about 2.25 square feet per tile.

425 divided by the square feet in one tile -- that would give you the number of tiles. It would take about 189 tiles.

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14y ago

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