A concrete block is 18 inches long and 8 inches high. Therefore, about 6 block for each side = 9 feet 6 inches, with the end block of the next side turned sideways. 4 sides X 6 block is 24 block per course and where I live I would need at least 6 coarses below grade for a total of 144. I would get 10% extra just in case which would make it 158. You would have to add to this for any height above grade.
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volume of wall = 10 * 10 *12*12 and volume of blocks = 8 * 16 no.of block =14400/128=112.5 112 blocks
More info needed. There are so many sizes of concrete blocks. Different industries use different sizes. 6 x 2 x 10 is just ONE size.
10 to 12 blocks
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1000