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A Step-by-Step Guide to Using SUMIFS in Microsoft Excel

The SUMIFS function works in a similar way with text as with numbers, but there are two key differences. First, text in Excel ...
Ars Technica

Using Excel's SUMIF (or SUMIFS) with a column of criteria

I keep running into situations in Excel where I want to calculate a conditional sum, but my criterion is something along the lines of "Include cell B1 if cell A1 is a number, likewise B2 and A2, B3 ...