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What are examples of magic mountain an circle diagram proofs for 2nd - 5th grade math problems? I want to teach how to prove word problem outcomes of addition and subtraction.

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What are "magic mountain an circle diagram proofs"? – Asaf Karagila May 10 '13 at 3:17
    
That was really my question. I have figured out what magic mountain is, I think, but am not sure of circle diagram proofs. Magic mountains are number bond diagrams, right? – McLean May 12 '13 at 3:11

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