If you want to add a page number to a docs sheet, then I can tell you the simplest way by which you can add numbers to the sheet as you want to add, whether the number you can add to the footer or header,
Add Page Numbers to Google Docs
- You have to open the doc sheet
- First, you need to go to insert in the menu bar of the sheet
- you can add a page number by clicking on the page number it will show, anywhere on the page
You can add numbers on every side of the page as you are seeing, if you add a number on a page, you are helped, it saves your time in finding the page.