4 yo: I know the biggest number. Me: What? 4 yo: 160 billion. 8 yo: What about 160 billion and one? 4 yo: Oh yeah, it's that.
He may be about the age you could introduce the concept of a proof. IIRC this was the first proof I taught my older son.
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this is a really good video for that https://www.youtube.com/watch?v=Uj3_KqkI9Zo …
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