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How to Increment a Number in Excel. Product IDs, serial numbers and other reference numbers require a unique identifier to avoid confusion when referencing a product or specific data point.
You can add a zero before a number in Google Sheets and Excel using this tutorial. You need to change cell formatting or use function.
Learn how to use the ISNUMBER function in Excel. The ISNUMBER function's purpose is to return TRUE if the function is a number.