I have always hated Cootie Catchers, but my students love them. A Cootie Catcher is a folded paper toy, which originally was intended to be a fortune teller, but we use them to practice math. They make a great interactive tool that we use to practice place value, rounding, basic facts, and most recently fractions.
I found this great book, Math Cootie Catchers, 20 Standards Based Cootie Catchers, published by Creative Teaching Press. It includes step by step directions on how to fold them. It has Cootie Catchers to practice number and operations, fractions and decimals, algebraic concepts, geometry, time, money, and measurement.
You don't have to have a book to make Cootie Catchers. Here is a great link that I found on Pinterest for making your own. It's on the I (Heart) Teaching blog.
If you need a refresher course on how to fold them, check out this video.
Creative Teaching has cootie catchers for other subjects and grade levels. You can check them out here on the Creative Teaching Website.