In school, 8 yo is learning mechanical methods for multiplication. As an antidote we do the same problems in our heads on the way to school.
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I didn't realize till I had kids how early plug-and-chug started. No wonder it felt so natural in college. I'd been doing it since 8.
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At what age are they typically allowed to use calculators in US schools?
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Plug-and-chug is dull, though, and it's inferior to other more entertaining methods. See: http://amzn.to/2wzEI1n / http://bit.ly/2gcrNMI
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