Invent with the recycling bin
Give each pair a bag of clean recyclables and a problem: "Build something that keeps a pencil from rolling off the desk." Kids build, test it and fix it. Afterward, ask what they changed and why. That's the real inventor process in 20 minutes.
Why it works: going from real objects to pictures to symbols is a core recommendation of the U.S. Department of Education's elementary math guide.
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