You may have been working on several Microsoft Excel workbooks, but have now finished for the day. You want to close all open workbooks, saving the changes in each of them.
With the workbooks open, hold down the Shift key and click the Close 
button at the top right of the Microsoft Excel Title bar.
A box appears asking whether you want to save changes to the active workbook.
Click Yes To All to save changes to all workbooks and close them all.
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Similarly, if you want to close all workbooks WITHOUT saving any of them, use Shift-X close Excel. When it prompts to Save – Save All – Don’t Save – Cancel. Hold Shift again, and click Don’t Save. It will close all of them without saving or asking.