How to Create Your Own Fractions Manually in Word 2007
Word 2007’s AutoCorrect feature can build common fractions for you from a small set of existing fraction "characters." However, when you need a different fraction, such as 3/64, you can create it manually.
Press Ctrl+Shift+= (the equal sign).
This is the keyboard shortcut for the superscript command.
Type the numerator.
This is the top part of the fraction. For example, type 3 for 3/64.
This turns off superscripting.
Type the slash.
This will separate the numerator from the denominator.
This turns on subscripting.
Type the denominator.
This is the bottom part of the fraction.
This turns off subscripting.