How many squre feet is 9 feet 2 inches wide x 9 feet 9 inches long?

Answer 1

One way:

9 ft 2 in = 9 and 1/6 feet = 55/6 feet

9 ft 9 in = 9 and 3/4 feet = 39/4 feet

(55/6) x (39/4) = (55 x 39) / (6 x 4) = (2145) / (24) = 89.375 square feet

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Another way:

1 foot = 12 inches
1 square foot = 144 square inches

9 ft 2 in = (9 x 12) + 2 = 110 inches

9 ft 9 in = (9 x 12) + 9 = 117 inches

(110) x (117) = 12,870 square inches = (12,870 / 144) = 89.375 square feet