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paulg's profile
Paul Graham
Paul Graham
Paul Graham
Verified account
@paulg

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Paul GrahamVerified account

@paulg

paulgraham.com
Joined August 2010

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    Paul Graham‏Verified account @paulg 13 Sep 2017

    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).

    1:13 AM - 13 Sep 2017
    • 17 Retweets
    • 254 Likes
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    10 replies 17 retweets 254 likes
      1. New conversation
      2. Will Critchlow‏Verified account @willcritchlow 13 Sep 2017
        Replying to @paulg

        I'd multiply by 10 first. Saves having any fractions in the mix.

        3 replies 0 retweets 11 likes
      3. Paul Graham‏Verified account @paulg 13 Sep 2017
        Replying to @willcritchlow

        I ask the 8 yo about this, and he said he tried it this way first, but that 5 yo could only halve small numbers.

        1 reply 0 retweets 3 likes
      4. Will Critchlow‏Verified account @willcritchlow 13 Sep 2017
        Replying to @paulg

        Well, good work then 😋👍

        0 replies 0 retweets 0 likes
      5. End of conversation
      1. New conversation
      2. macarthy‏ @macarthy 13 Sep 2017
        Replying to @paulg

        Check out https://en.m.wikipedia.org/wiki/Trachtenberg_system … if you want to teach them awesome mental math

        1 reply 0 retweets 1 like
      3. Paul Graham‏Verified account @paulg 13 Sep 2017
        Replying to @macarthy

        I own the book about it actually.

        1 reply 0 retweets 0 likes
      4. macarthy‏ @macarthy 13 Sep 2017
        Replying to @paulg

        Leave it somewhere findable for enquiring minds

        0 replies 0 retweets 0 likes
      5. End of conversation
      1. New conversation
      2. Mark Rogowsky‏ @maxrogo 13 Sep 2017
        Replying to @paulg

        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.

        1 reply 1 retweet 6 likes
      3. 1 more reply
      1. Ted Alling  👊🏼 🚀‏ @tedalling 13 Sep 2017
        Replying to @paulg

        Nice.. You should talk to my buddy, who changed my family's life @DLouzonishttps://www.linkedin.com/pulse/hey-entrepreneurs-10x-your-kids-too-daniel-louzonis …

        0 replies 0 retweets 3 likes
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      1. New conversation
      2. Laurens Gunnarsen‏ @MathPrinceps 13 Sep 2017
        Replying to @paulg

        A strong recommendation for you: Steven B Smith's THE GREAT MENTAL CALCULATORS. Surprisingly illuminating stuff. http://amzn.to/2y6g1ee 

        1 reply 0 retweets 3 likes
      3. Laurens Gunnarsen‏ @MathPrinceps 13 Sep 2017
        Replying to @MathPrinceps @paulg

        An interesting minor tidbit for you: several of the most powerful mental calculators known to history were illiterate.

        2 replies 0 retweets 0 likes
      4. 1 more reply
      1. New conversation
      2. Colin Percival‏ @cperciva 13 Sep 2017
        Replying to @paulg

        I would have reversed those steps in order to avoid fractions. Of course, that could result in integer overflow instead...

        1 reply 0 retweets 2 likes
      3. 1 more reply
      1. David Waring‏ @davidwaring 15 Sep 2017
        Replying to @paulg

        I enjoy your essays. Thanks for sharing.

        0 replies 0 retweets 0 likes
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      1. lee cauble‏ @leecauble 13 Sep 2017
        Replying to @paulg

        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 👹

        0 replies 0 retweets 0 likes
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      1. David Manheim‏ @davidmanheim 13 Sep 2017
        Replying to @paulg

        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.

        0 replies 0 retweets 0 likes
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      1. John Schindeler‏ @jschindeler 13 Sep 2017
        Replying to @paulg

        #Solid

        0 replies 0 retweets 0 likes
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