Last night overheard the boys talking in bed. The 8 yo was teaching the 5 yo how to multiply by 5 (divide by 2 then multiply by 10).
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Replying to @paulg
A strong recommendation for you: Steven B Smith's THE GREAT MENTAL CALCULATORS. Surprisingly illuminating stuff. http://amzn.to/2y6g1ee
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Replying to @MathPrinceps @paulg
An interesting minor tidbit for you: several of the most powerful mental calculators known to history were illiterate.
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Replying to @MathPrinceps @paulg
Surely it is a significant indictment of the enterprise of math education that many of the most adept calculators were entirely self-taught.
1:44 AM - 13 Sep 2017
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