There are 144 inches in a square foot so, 144 x 80 is 11520 inches in 80 square feet.
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80 ft * 60 ft = 80*60 sq ft = 4800 sq ft
There are 0.3125 16x16 squares in 80 sq ft.
9 sq ft = 1 sq yd so 80 sq ft = 80/9 = 8.88... sq yards.
16" * 16" = 1.77777 square feet, so , 80 / 1.77777 = 45 tiles
20 sq ft = 20*12*12 = 2880 sq inches 8 inch * 10 inch = 80 sq inches. Maximum number of rectangles (NOT SQUARES!) is 2880/80 = 36. This is a maximum because the answer depends on the dimensions of the roll. If, for example, the roll were 1 ft*20 ft, you will get only 1 rectanle across and 30 along the length. You will have a 2 inch*20 ft strip of waste.