Changing Default Number Format in Excel

1. Open a new Excel workbook.
2. Click on the File tab in the top left corner of the screen.
3. Click on Options in the left-hand menu.
4. In the Excel Options dialog box, click on Advanced in the left-hand menu.
5. Scroll down to the When calculating this workbook section.
6. In the Workbook options section, you will see a drop-down menu labeled Number format. Click on this menu and select the number format you want to use as the default.
7. Click OK to save your changes.

From now on, any new workbooks you create in Excel will use the number format you selected as the default. If you want to change the number format for an existing workbook, you can do so by selecting the cells you want to format, right-clicking on them, and selecting Format Cells. From there, you can choose the number format you want to use.