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Pivot tables are great because they force people to put their data into tables.
Formulas suck. You only need sum. Everything is a sum, if you enter your data correctly in a table.
Want to substract? yes, that is a sum in which one of the numbers are negative. Multiply? Yes that is more sums.
What about IF statements then? No, no, no. Conditions are simply factors in a sumproduct.
Learn the keyboard shortcut for sum. It's the straight edge and compass of excel math.