There are 12 inches in 1 foot and 1/12 of a foot = 1 inch, though its not clear from the way the question is phrased that this is the you are seeking.
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1 ft = 12 inches. 1 square foot = 1 ft x 1 ft = 12 inches x 12 inches = 12*12 sq inches = 144 sq inches.
1 ft = 12 in → 5 ft 4 in - 1 ft 6 in = (4 + 1) ft 4 in - 1 ft 6 in = 4 ft (12 + 4) in - 1 ft 6 in = 4ft 16 in - 1 ft 6 in = 3 ft 10 in Alternatively, convert to inches, subtract and convert back: 1 ft = 12 in → 5 ft 4 in - 1 ft 6 in = (5 x 12 + 4) in - (1 x 12 + 6) in = 64 in - 18 in = 46 in = (3 x 12 + 10) in = 3 ft 10 in
1 ft = 12 inches 1/3ft = 12 x 1/3 = 12/3 = 4 inches
12 inches = 1 ft so 840 in = 840/12 ft = 70 ft. Simple!
12 in = 1 ft → 11.5 in x 11.5 in = (11.5 ÷ 12) ft x (11.5 ÷ 12) ft ≈ 0.918 sq ft