13 sq ft on the dot. I'm almost sure.
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Remember there are 9 sq ft. in 1 sq. yard. Hence 10 ft x 12 ft = 120 sq. ft. Divide by '9' 120 / 9 = 13 3/9 sq yds. = 13 1/3 sq yds = 13.333... sq yds.
0.3048 m = 1 ft (exactly) ⇒ 0.3048 m x 0.3048 m = 1 ft x 1 ft ⇒ 0.0929 sq m ≈ 1 sq ft ⇒ 30 sq m ≈ 30 ÷ 0.0929 sq ft ≈ 322.92 sq ft
9 sq ft = 1 sq yd so 45 sq ft = 45/9 = 5 sq yds
400 sq ft = 37.161 sq meters (rounded)
1 sq yd = 1 yd * 1 yd = 3 ft * 3 ft = 9 sq ft. 11 ft * 9 ft = 11*9 sq ft = 99 sq ft = 99/9 sq yd = 11 sq yd