48
144 of them.
221 of them. Get extra for breakage.
144
204 tiles.
Assuming you mean the shed is 12 feet by 12 feet - that's a total of 144 sq. ft.
Assuming that the 12x12 is inches.12 in. x 12 in. = 1 ft x 1 ft = 1 square (sq) footGiven that you have 200 square feet to cover:(200 sq ft) / (1 sq ft) = 200 unitsThat means it takes 200 12x12 in. squares to cover a 200 sq ft. space.If you meant 12x12 to be in feet:12 ft x 12 ft = 144 sq ft.200 / 144 ~= 1.39 units (It would take 1.39 squares to cover it)
256 tiles
240 Get extra for breakage.
1 sheet of 12 ft x 12 ft will cover 144 sq ft. More than enough.
Area = 48 ft * 10 ft = 48*10 sq ft = 480 sq ft.
One tile that is 12 ft by 12 ft will be more than enough.