A strong recommendation for you: Steven B Smith's THE GREAT MENTAL CALCULATORS. Surprisingly illuminating stuff. http://amzn.to/2y6g1ee
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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An interesting minor tidbit for you: several of the most powerful mental calculators known to history were illiterate.
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I'd multiply by 10 first. Saves having any fractions in the mix.
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So fun to have kids learn that the "8s" are 8,6,4,2,0 repeat -- forever. And other neat hacks like "9s" always add up to 9.
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I would have reversed those steps in order to avoid fractions. Of course, that could result in integer overflow instead...
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i think it's easier to divide by two first :)
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It works similarly but less well in my house; the 5 year old tries to teach the 3 year old how to add numbers. I guess I need to wait a bit.
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Nice.. You should talk to my buddy, who changed my family's life
@DLouzonis https://www.linkedin.com/pulse/hey-entrepreneurs-10x-your-kids-too-daniel-louzonis …Thanks. Twitter will use this to make your timeline better. UndoUndo
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My 3rd grade teacher gave times tables as
#punishment forget I will not talk. Would never work. But I can multiply and divide like a
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