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SUM is the spreadsheet equivalent of an open invite: it welcomes everything into the total, whether it belongs there or not.

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To fix an Excel spreadsheet not adding up correctly, check the SUM function's syntax and make sure there aren't any text format cells in the sheet.

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The SUM function in Excel allows you to quickly add a range of numbers together, whether they are in a single column, row or in various cells. Here’s how to use the SUM function in Excel.