To insert an equation in Word 2007 or Word 2010, please follow the steps below:
Go to the Insert tab and click Equation in the Symbols group. Here you will find several options.
a) You can choose from a built-in equation, which you can then edit to your needs.
b) You can select more equations from Office Online.
c) You can also select Insert New Equation to insert your own custom equation.
Once you have made a selection from the Insert Equation menu, the Equation Tools Design tab will appear, providing several tools, symbols and structures that you can use.
Note: Equations created in Word 2007 and Word 2010 are compatible with each other and can be edited in either program.