My daughter (8) had trouble multiplying 1000 by 10, because (i) 10,000 doesn't have a new name and (ii) "ten thousand" is a bit of a tautological answer. Good mathematical instincts, even if she got it wrong.
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Replying to @wtgowers
I love that. “Well sure, it’s ten thousands, you just said that, but what IS it?”
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Replying to @JSEllenberg @wtgowers
On this subject, I think I would refer her to Barry Mazur's remarkable essay, "When Is One Thing Equal to Some Other Thing."
1:21 PM - 17 Jan 2019
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