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How many fence posts do you need? Count the gaps, then add one
Dividing the fence length by the spacing gives gaps, not posts. A 30 ft run worked out step by step, with the real spacing.
How many blocks are in a wall? Count the module, not the block
A block wall is counted by the module, which includes the mortar joint. Here is the two-way count, with a 6 m wall worked out.