10' X 11' X 3" X (1'/12") = 27.5 cubic feet
27.5 cubic feet X (1 cubic yard / 27 cubic feet) = 1.02 cubic yards
85.8 cubic meters = 112.22 cubic yards
At 4" thick you would need at least 7.04 cubic yards. At 6" thick you'll need at least 10.56 cubic yards. If the slab is 2" thick, you'll need 3.52cubic yards.
... cubic square what? Meters? Yards? equals in cubic feet?
10 x 10 x 10 equals 1,000 cubic feet. To convert cubic feet to cubic yards, divide by 27 (since 1 cubic yard equals 27 cubic feet). So, 1,000 cubic feet is approximately 37.04 cubic yards.
1,050 cubic feet equals 38.89 cubic yards.
10.67 Cubic Yards
240 cubic feet = about 8.9 cubic yards. (8.88888889 cubic yards).
47.55 cubic yards . 4" would be 5.23 cubic yards.
You will need a minimum of 74.1 cubic yards.
1.85 cubic yards equals 49.95 cubic feet.
If it is 4 inches deep/thick, 2 cubic yards. If it is 6 inches deep/thick, 3 cubic yards.
3.6 cubic yards will be enough.