James sorting through Cuisinaire rods chooses the 2,3,5 and 7 "These are essential to mathematics -- you don't need the others because you can make them with these."
James: Sometimes I think about numbers as squares -- like 4 because it is a square of two and two. And nine is a square of three and three. You can't do that with all numbers because there aren't enough or there's extras"
I asked him if someone had been talking to him about square numbers and he was surprised and excited to find out that other people had the same idea.
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