In Excel 2016, 2013 and 2010, the version of excel can be checked using the Help or Account menu.
Click the File menu and select Help menu.
Navigate to the About Microsoft Excel section displayed on the right hand side. This would display the Excel Version details, as shown below.
Screenshot in Excel 2013
And if you want to see additional information then you can click on the Additional Version and Copyright Information. This would display the following About Microsoft Excel Window