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60
sqrt(12960000) = 3600
No real short cut I know of, just learn your multiplication tables and know your perfect squares. Once you do that you recognize that 36 is the perfect square of 6 so 3600 is the square of 60.
46% of 3600 square feet:= 46% * 3600= 0.46 * 3600= 1,656 square feet
1 square yard = 9 square feet so 3600 sq yards = 3600*9 = 32400 sq ft.