First, we find the area of the floor in square meters.
9 m * 16 m = 144 m^2
Now we convert the square meters to square feet.
144 m^2 * (1 ft)/(0.3048 m) * (1 ft)/(0.3048 ft) = 1550.0031 ft^2
Now we find the area of a 4' by 8' sheet of plywood in square feet.
4 ft * 8 ft = 32 ft^2
Now we divide the area of the floor by the area of a plywood sheet.
(1550.0031 ft^2)/(32 ft^2) = 48.44 sheets.
That means you need to buy 49 sheets.