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.

For Excel to divide the values, however, the cell must contain a delimiter, a character that specifies where the first number ends and the second one begins.

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.