1 ft = 12 inches.
1 square foot = 1 ft x 1 ft = 12 inches x 12 inches = 12*12 sq inches = 144 sq inches.
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1 sq ft is equal to 144 sq in.
1 ft = 12 inches 1 sq ft = 12 x 12 = 144 sq in 10 sq ft = 10 x 144 = 1440 sq in
If you mean "how many 3x5-inch cards cover 300 sq. ft": 1 card = 3*5 =15 sq. in. = 15/144 sq. ft. (12x12 = 144 in^2 = 1 ft^2) N cards *15/144 = 300 N = (300*144)/15 = 2880
1 sq yard = 1 yd x 1 yd = 3 ft x 3 ft = 9 sq ft.
1 sq metre = 10.764 sq feet.