functions

Here's some notes on how functions work.

http://www.mathsisfun.com/sets/function.html

Here's a quick game to show you how simple functions work.

http://hotmath.com/util/hm_flash_movie.html?movie=/learning_activities/interactivities/function_machine.swf&return_to=Algebra%20Activities%20-%20Math%20Activities%20-%20Hotmath&title=The%20Function%20Machine

Here's a game to help you devleop the skill of finding the rule in a function.

http://www.learningtoday.com/corporate/files/games/Algebra_Functions_L3_V1_T4a.swf