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One, if it is big enough.
4-ft x 8-ft = 32 square feet in each sheet400/32 = 121/2 sheets
A roofing square covers an area of 100 square feet. A standard 4x8 sheet measures 32 square feet (4 feet x 8 feet). To determine how many 4x8 sheets are in a roofing square, divide 100 square feet by 32 square feet, which equals approximately 3.125 sheets. Therefore, you would need about 4 sheets of 4x8 to cover a roofing square, accounting for waste and cuts.
Plywood comes in 4 x 8 sheets = 32 sq ft 300/32 = 9.37 so you need 10 sheets
768 sq ft