Convert everything to feet (10 inches = 10/12 feet), and multiply. The result will be in cubic feet.
8 ft * 10 ft * 0.5 ft = 40 cubic feet
An area 10 foot x 10 foot is 100 square feet. 100 cubic feet of sand would cover it with a one foot deep layer of sand. If the sand needs to be 6 inches deep, then 50 cubic feet are be needed, or 25 cubic feet if the sand is to be 3 inches thick.
That would take 250 cubic meters of sand to fill as 10*5*5 is 250.
10 x 10 x 2/3 ie 66.67 cu ft = 66.67/27 cu yds, call it 2-and-a-half.
8*10*4/12 = 26 and 2/3 cubic feet
8 ft * 10 ft * 0.5 ft = 40 cubic feet
An area 10 foot x 10 foot is 100 square feet. 100 cubic feet of sand would cover it with a one foot deep layer of sand. If the sand needs to be 6 inches deep, then 50 cubic feet are be needed, or 25 cubic feet if the sand is to be 3 inches thick.
That would take 250 cubic meters of sand to fill as 10*5*5 is 250.
10 x 10 x 2/3 ie 66.67 cu ft = 66.67/27 cu yds, call it 2-and-a-half.
I wasn't sure is fhe 10 was for inches or feet, so both calculations are below. 10 inches deep: 80 x 50 x 1 = 4000cf x 10/12 = 40000 / 12 = 3333.334 cubic feet of sand 10 feet deep: 80 x 50 x 10 = 40,000 cubic feet of sand
8*10*4/12 = 26 and 2/3 cubic feet
You would need about 13 cu yards or about 15 tons.
That depends on how deep you want the top soil! 5' X 8' = 40 square feet. If you want it 1' deep you would need 40 Cubic Feet, 3" deep you would need 10 cubic feet of top soil.
50 x 5 x 0.33333r = 83 cubic yards
You will need 1500 cubic feet.
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10 cu ft