Your question does not make sense. 100 yards is a measure of length, but square footage is a measure of area.
4,050 square feet.
299 square feet = 33.22 square yards
9 square feet = 1 square yard.
6 square yards. 3 feet = 1 yard, so 9 ft by 6 ft = 3 yards by 2 yards Square footage/square yards is calculated by multiplying the length by the width. 3 X 2 = 6 square yards 9 X 6 = 54 square feet
Measure the height of the wall from floor to ceiling. Measure the width of the wall. Multiply height x width = square footage. For square yards, divide the square footage by 9.
100 yards x 50 yards = 300 feet x 150 feet = 45,000 square feet
Muliply the square yardage by 9 gives you square footage.
A square yard is 3ft x 3ft, or 9 square feet in a square yard. So, if you have square footage, divide by 9 to get square yards