# Insert or edit an equation or expression

You can insert and edit mathematical equations and expressions directly in Word and save them as templates for later reuse.

Earlier versions of Word use the Microsoft Equation Editor add-in or the MathType add-in. You can, however, use Microsoft Word for Mac 2011 to open and edit mathematical equations or expressions that were created in earlier versions of Word or MathType. You can also create equations or expressions that are compatible with earlier versions of Word, by using Microsoft Equation Editor. For more information about how to use Microsoft Equation Editor, see Edit an equation that was created in an earlier version of Word.

Do any of the following:

Insert a frequently used or built-in equation or expression

To save time, you can insert a built-in equation and edit it to suit your needs instead of typing the equation character by character.

- Click where you want to insert an equation or expression.
- On the
**Document Elements**tab, under**Math**, click the arrow next to**Equation**, and then select the equation or expression that you want from the equation gallery.

To edit a variable in an equation or expression, press the right or left arrow key until you highlight the variable that you want to edit. Then, hold SHIFT and press the right or left arrow key to select the variable.

Insert an equation or expression by using math symbols or built-in structures

You can write an equation or expression by selecting any combination of individual mathematical symbols and built-in mathematical structures, as shown in this example:

- Click where you want to insert an equation or expression.
- On the
**Document Elements**tab, under**Math**, click**Equation**.

- Do any of the following:

To |
Do this |
---|---|

Insert individual math symbols into an equation |
On the To see more math symbols, rest the pointer on a math symbol, and then click . |

Insert built-in math structures into an equation |
On the To edit a variable in an equation or expression, press the right or left arrow key until you highlight the variable that you want to edit. Then, hold SHIFT and press the right or left arrow key to select the variable. |

- Click outside the equation or expression to exit it, and then return to the document.

** Notes **

- When you insert an equation or expression, Word automatically converts it to professional format. To change the equation or expression from professional format to linear , click the arrow next to the equation, and then click
**Linear**. - To change the equation or expression into a stand-alone graphic, click the arrow next to the equation, and then click
**Change to Display**. After you change the equation or expression into a stand-alone graphic, you can set the justification to**Left**,**Right**,**Centered**, or**Centered as a Group**. - You can use Unicode characters and Math AutoCorrect entries to replace text with symbols. For more information, see Insert a symbol.

Insert math symbols by using Math AutoCorrect

Instead of searching through the gallery of math symbols to create an equation or expression, you can use Math AutoCorrect to quickly add commonly used mathematical symbols to an equation or expression, such as the symbol for pi.

** Note ** To see all the available Math AutoCorrect entries, on the **Tools** menu, click **AutoCorrect**, and then click the **Math AutoCorrect** tab.

- Click where you want to insert an equation or expression.
- On the
**Document Elements**tab, under**Math**, click**Equation**. - In the equation box, type a backslash followed by the friendly name or alias of the math symbol that you want to insert. For example, to insert the symbol for pi, type
**\pi**and then press the SPACEBAR .

Edit an equation or expression

- Click the equation or expression.
- On the
**Equation Tools**tab, under**Math Symbols**or under**Structures**, select the math symbols or structure that you want to add to the equation, or type or delete the variables and numbers in the equation.

To edit a variable in an equation or expression, press the right or left arrow key until you highlight the variable that you want to edit. Then, hold SHIFT and press the right or left arrow key to select the variable.

- Click outside the equation or expression to exit it, and then return to the document.

** Notes **

- To change the equation or expression from professional format to linear , click the arrow next to the equation, and then click
**Linear**. - To change the equation or expression into a stand-alone graphic, click the arrow next to the equation, and then click
**Change to Display**. After you change the equation or expression into a stand-alone graphic, you can set the justification to**Left**,**Right**,**Centered**, or**Centered as a Group**.

Add an equation or expression to the list of frequently used equations or expressions

- Click the equation or expression.
- Click the arrow next to the equation or expression, and then click
**Save as New Equation**. - In the
**Name**box, type a name for the equation or expression. - On the
**Category**pop-up menu, select one of the existing categories, or add a new category by typing it in the**Category**box. For example,**My Equations**. - In the
**Description**box, type a brief description of your equation or expression, and then click**OK**.

** Note ** To access the equation or expression later, on the **Document Elements** tab, under **Math**, click the arrow next to **Equation**, and then select the equation or expression from the gallery of equations and expressions.

Delete an equation or expression from the list of frequently used equations or expressions

When you no longer need an equation, you can delete it from the list of frequently used equations or expressions.

** Caution ** Be sure to delete only those equations and expressions that you've created and added to the list of frequently used equations. Although you can delete any of the equations in the Built-In category that were installed with Word, the only way to restore them is to manually recreate them or to reinstall Word. All built-in and user-defined equations are stored in the /Users/ *username*/Library/Application Support/Microsoft/Office/User Templates/My Document Elements/Equations.dotx file. If you are using Mac OS X 7 (Lion), the Library folder is hidden by default. To show the Library folder, in the Finder, click the **Go** menu, and then hold down OPTION .

- On the
**Document Elements**tab, under**Math**, click the arrow next to**Equation**.

- Hold down CONTROL , click the equation or expression you want to delete, and then click
**Delete**on the shortcut menu.

Add items to the list of Math AutoCorrect entries

You can use Math AutoCorrect to quickly insert symbols that are included in the built-in list of Math AutoCorrect entries. For example, type **\pi** to insert the symbol for pi. If the list of built-in entries doesn't contain the corrections that you want, you can add new entries.

- On the
**Tools**menu, click**AutoCorrect**, and then click the**Math AutoCorrect**tab. - In the
**Replace**box, type a backslash that is followed by a friendly name or alias for the math symbol that you want to use. For example,**\plus**. - In the
**With**box, type the symbol that you want to appear when you type a backslash with the friendly name. For example, the plus sign (+). - Click
**Add**.

** Note ** To delete a Math AutoCorrect entry, select the entry in the list, and then click **Delete**.

### See also

Edit an equation that was created in an earlier version of Word