*A short followup to the post Two Ideas for Introducing Functions.*

Yesterday I discovered another payoff from the hilariously gruesome Meat-a-Morphosis video: a powerful and memorable analogy for Inverse Functions. Imagine if we ran the machine

*backwards -*if we put chicken nuggets in and the original chickens came out? My students thought this was hilarious.Inverse Functions: What if you put in nuggets and out came chickens? Image adapted from original at Meat-a-Morphosis ( Patty Hill & Michael Word) |

Even more fun: for students still coming to terms with f(x) notation, faced with this:

doesn't this convey the same idea even more clearly?

Put a chicken into the nuggetiser, then into the de-nuggetiser and you get back your chicken (OK , maybe with few ruffled feathers and a lot of squawking!) |

Who would have thought there was so much laughter in a lesson on functions? Thanks to the Meat-a-Morphosis team at Kealing Middle School, Austin Texas for a wondeful teaching resource.