6 inches = 1/2 foot
Volume = (surface area) x (depth) = 450 x 1/2 = 225 cubic feet = 81/3 cubic yards.
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One yard of concrete will cover approximately 90 square feet at a depth of 3-1/2". At an even 3-1/2", you will need just over 3 yards. This does not allow for any footings, turndowns, or a thicker slab.
16 x 16. Actually if you do the math, you could do a 18 x 18, but you never get 4 yards and you rarely get a form that is a perfect .33 feet.
5x8=40sq.inches 12x20=2880. sq. inches divide 2880 divided by 40 = 72 pavers
5 inches is 5/12 feet. So volume of concrete required is 490 x 5/12 = 204.16 cubic feet There are 3 x 3 x 3 = 27 cubic feet in a cubic yard. Therefore the volume required is 204/27 = 7.56 cubic yards (say 8 cubic yards). A useful example of estimating foundations and floor is at `Estimating - Foundation and Floor' http://www.inquirewithin.biz/Vol2/Estimating/estimating_foundations.htm
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