12 x 24 is just a number, and there are no sq ft in pure numbers. If you meant 12in x 24 in then that's 1ft x 2 ft = 2 sq ft. If you meant 12ft x 24 ft then that's 288 sq ft. It is a common problem that a writer believes that the reader knows what the writer means. That might work in poetry, but it never works in maths and science.
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Area = 24 ft * 12 ft = 24*12 sq ft = 288 sq ft
12' * 21 ft = 12*21 sq ft = 252 sq ft.
24/12*22/12 = 3.6 (recurring) square feet
12 ft x 41 ft = 492 sq ft
1728 sq. in. 1 foot = 12 inches 1 sq. ft. = 12 in. x 12 in = 144 sq. in. 144 sq. in./ sq. ft. x 12 sq. ft. = 1728 sq.in.