1 ft^2 = 144 in^2
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You don't. Square ft are a measure of area, whereas "linear" inches are a measure of distance. Likewise you can't convert cubic feet into inches, or apples into oranges.
Total square inches divided by 144 = square ft.
It is easiest to convert the length and breadth to feet first. 3 ft 4 inches = 3 4/12 = 3 1/3 = 10/3 ft, and 10 ft 10 inches = 10 10/12 = 10 5/6 = 65/6 ft So area = (10/3)*(65/6) = 650/18 = 36.111 sq feet
You don't. You either A) convert 18 cubic inches into cubic feet, or B) convert 18 square inches into square feet. A... there are 1728 cubic inches in a cubic foot, so 18 cu in would be 0.00104 cu ft. B... there are 144 square inches in a square foot, so 18 square inches would be 0.125 sq ft.
8 in * 10 ft = 8 in * 10 ft = 960 square inches or 8 in * 10 ft = 2/3 ft * 10 ft = 62/3 square feet