Add Calculator function buttons to Excel's toolbars

When editing a document in Excel, you sometimes need to calculate some data value (subtraction may be used), generally we are click "start → program → attachment" and then click "Calculator", if each time this operation is very troublesome. In fact, we can add the calculator directly on the Excel toolbar, as follows.

Open Excel, click Tools (T) On the View menu, click Custom (c), and then click the command Options bar in the Custom (c) window. In the list of categories, click Tools, in the command (D) list, click the Customize button, and then drag the selected command from the command list to the toolbar and click the Close button to exit Excel. To reopen Excel, click the button you just added, and the calculator appears in Excel.