3-5 items, that's all a human can grouphttps://twitter.com/averykimball/status/1486107799981637639 …
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2/ (b) the switch over to it was based on data
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there's been many different things that have been "New Math" over time, presumably of different levels of desirability (Lehrer's "New Math" song is about the kind of math I learned in elementary school)
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Cartoon aside... I'm inclined to believe that even the less-than-the-smartest kids benefit from the foundational skills that elementary students are taught from the more modern curricula. I have no evidence (haven't looked, don't care to) but it fits very well with my priors.
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