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it will take 64 block, if the morter joints are all slightly larger than a half inch, and if you make use of the half blocks you create.
To calculate the number of 6-inch blocks one bag of cement can lay, we first need to determine the volume of one bag of cement. A standard bag of cement typically weighs 94 pounds and has a volume of approximately 1 cubic foot. Assuming the blocks are standard 6-inch concrete blocks (with dimensions of 8 inches by 8 inches by 16 inches), one bag of cement can lay approximately 12 blocks. This calculation is based on the assumption that each block requires about 0.83 cubic feet of concrete, and a bag of cement can yield roughly 1.2 cubic feet of concrete when mixed with water and aggregates.
There are several sizes, however the one most commonly referred to is the large, rectangular block with two holes - usually used for building foundations. This type of block measures 8" x 8" x 16" and weighs approximately 29 pounds. 8 by 8 by 16 inches is the nominal size, but 7 5/8 by 7 5/8 by 15 5/8 inches actual size. It's 3/8 of an inch smaller to all room for the mortar that goes between the blocks.
It depends on how deep the cake pan is.
3/8 of an inch is the same as 0.375 of an inch in decimals.