The Mathematics tab that enables you perform computations and graphing is not one of the default tabs in Microsoft Word. Follow the 5 steps below to get the Mathematics tab:
You may also watch the video tutorial on this:
Now launch Word and select the Blank document template.
Click the File tab and select options.
If you do it correctly, the following box should pop-up.
Click Add-ins to access the View and manage Microsoft Office Add-ins box.
Access the COM Add-ins dialog box by clicking the Go button, select the Microsoft Mathematics Add-in checkbox and then click OK.
Now restart Word. If everything was successful you can now see the Mathematics tab.