Last week in math class I learned that paper folding is very mathematical! It was really interesting to see how the simple act of folding an origami box uncovered so many mathematical challenges. It was a truly rigorous way to explore geometry and proofs - I personally had difficulty expressing the reasons why I knew a given shape was what it was! Particularly challenging was finding a way to articulating why one folded line was parallel to another.
One question I have is how best to elicit the proofs. Is it best to have the whole class work independently and volunteer answers? Or would it be better to have students work in teams or groups? I'm personally inclined to say groups, because I know I could have used someone to bounce ideas off of when we did this in class.
I think this is a great way to explore geometry and practice articulating mathematical proofs in the classroom. While we engaged in this activity as a way to explore and provide proofs, I'm personally planning to adapt this activity into a lesson for 4th graders. My kids had some trouble with geometric shapes when they were learning about them last fall. I think (and my master teacher agrees) that examining geometric shapes while folding an origami box will help them better understand and remember what they learned. It helps that most of my class is rather origami obsessed, too!
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