How do you end a formula with an error and check it in Excel?

The correct choice is using the Error Checking feature found on the Formulas tab. This feature in Excel is designed specifically to help users identify and troubleshoot errors in their formulas. When you encounter an error in a formula, the Error Checking tool can provide insights into what might be wrong and suggest ways to correct it. It can also point out common issues such as division by zero or references to empty cells, enhancing the user's ability to rectify mistakes efficiently.

This tool is particularly useful for those who are working with complex spreadsheets where errors can easily occur and may not be immediately obvious. Users can access it directly from the Formulas tab, making it a straightforward option for checking and correcting errors.

In contrast, the other choices do not serve the same function as effectively. The Debug feature isn't specifically designed for checking formula errors, entering a '0' does not provide any systematic way to handle or check for errors in formulas, and formatting a cell as text would prevent the formula from calculating altogether. Therefore, the Error Checking feature is the appropriate and most efficient method for this purpose.