WHEN you run a spelling check in Microsoft Excel, you check only the current page. If you'd like to check all the worksheets in a workbook, follow these steps:

1) Right-click on any of the worksheet tabs

2) Choose "Select All Sheets"

3) Go to "Tools," then "Spelling"

4) Excel will now check all worksheets

5) To Ungroup sheets, right-click again on any worksheet tabs, and choose "Ungroup Sheets"