To edit a mathematical equation that was written in Word 2013, just click in the equation to make the changes you want. When you do, you’ll see Equation Tools in the ribbon.
Note: If you don’t see the Equation Tools, the equation may have been created in an older version of Word. If so, see Change an equation that was written in a previous version of Word.
Click Design to see tools for adding various elements to your equation.
In the Symbols group, you’ll find math related symbols. To see all the symbols, click the More button. To see other sets of symbols, click the arrow in the upper right corner of the gallery.
The Structures group provides structures you can insert. Just choose a structure to insert it and then replace the placeholders, the small dotted-line boxes, with your own values.
To control where and how the equation is displayed on the page, click the arrow on the right side of the content control—the container holding the equation.
The Professional option displays the equation as a two-dimensional value. The Linear option displays the equation so it fits on one line.