Launch Microsoft Excel 2010 and open the spreadsheet you want to edit. Select the worksheet for which you want to insert the page number. Click the "View" tab on the upper side of the Excel window.

If you are trying to write a number in Excel or Google Sheets that starts with zero (0), you may not do that due to the default settings. In that case, you should follow this tutorial to enter zero ...

Page breaks help in classifying & organizing your work in Microsoft Excel. Here is a guide that shows you how to insert, move, delete Page Breaks.