We were playing around trying to figure out an easy way to memorize the different techniques for operations on fractions last Friday in my intermediate algebra class. Suddenly this simple pattern emerged.
ADD/SUBTRACT FRACTIONS – CRISSCROSS APPLESAUCE
MULTIPLY FRACTIONS – APPLESAUCE APPLESAUCE
DIVIDE FRACTIONS – CRISSCROSS NO APPLESAUCE
This diagram shows how the system works in action. Please note: This diagram has been improved to show which direction for the crisscrosses. Thanks to the commenters for this suggestion.