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Awesome cooperative learning math strategy from The End of Molasses Classes by Ron Clark! Students work in teams to solve a math problem on a balloon using as many strategies as possible!

Angles, Triangles, and the Start of Geometry in 6th Grade Math! (middleschoolmathman.blogspot.com)

I seriously can't get enough of this in my classroom, and my students love it just as much! Freebie included!