The most popular post on this blog came out of a whim to make a cootie catcher for an activity with my homeroom last year during the first week when we get our homerooms for extra time.
Since then, people have asked for a printable and for rules for the "game."
First, here's a scan of my cootie catcher. No, it's not typed or fancy, but at least it's filled in!
Second, the rules of the "game."
Give each student a cootie catcher. Partner kids up. One person chooses an outer section, the other spells its vocab word opening and closing the cootie catcher with each letter. The first person then chooses an inner section and the second spells that color, again opening and closing. This time when it's opened, the first person must choose a color and calculate one of the measures of central tendency, explaining it to his partner. If they agree, they record the answer and switch roles.
I've also done this with simplifying radicals for a different class. I made two versions on two colors of paper. Kids worked all of the problems independently, checked them on an answer key. This allowed for some coaching among the student and differentiation of levels.
I hope this file is a help. Sorry it's taken a year for me to finally get it scanned and uploaded!