When you create a formula in Excel that refers to other cells in the worksheet, Excel will store the information about those cells as relative references. Relative references and their counterpart, absolute references, are one of the things that make spreadsheets such a powerful tool.
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The SUM function in Excel allows you to add up the values in a range of cells. However, sometimes you only want to add up the cells that meet certain criteria. That's where the SUMIF function comes in handy, along with the more capable SUMIFS function.
When writing a formula that references other cells, it can sometimes be useful to check that those cells contain a valid value. In this lesson, we'll look at Excel's ISNUMBER function as a way of doing this.
Do you need help with an Excel formula or function? We have lessons on a range of different Excel functions, and the list is growing all the time.