One square inch can be divided into sixteen quarter-inch squares. This is because each side of the square inch can be divided into four equal parts to create a total of sixteen quarter-inch squares within the larger square.
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If a 3-inch square was covered in 1-inch squares, you would need a total of 9 of the 1-inch squares to completely cover the 3-inch square. This is because you can fit a 1-inch square into each inch of the 3-inch square, resulting in a total of 9 squares to cover the entire area. Each of the smaller 1-inch squares would cover a portion of the larger 3-inch square, with no overlap or gaps if properly arranged.
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A square foot is 12 inches by 12 inches and contains 144 small one-inch squares. If "4 inch squares" means 4 inches long on each side then... 4 inches x 4 inches = 16 sq inches. 144 / 16 = 9 There are three four-inch segments along each side of the square, making 9 smaller squares within the 12 x 12 large one.
A 24x24 inch tile would be four square feet. 140 divided by 4 would be 35 tiles.
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