[dba-SQLServer] 666+666=?

jwcolby jwcolby at colbyconsulting.com
Mon Sep 19 12:01:44 CDT 2011


http://en.wikipedia.org/wiki/Trachtenberg_system


John W. Colby
www.ColbyConsulting.com

On 9/19/2011 11:34 AM, David McAfee wrote:
> Don't forget the 9's hand trick:
>
> Put down the finger of the number that you are multiplying with 9.
>
> for example, 9x4
>
> Hold you hands out with the backs of your hands facing you.
> put down your left index finger (or 4th from the left)
>
> The number of fingers to the left of the finger (3) that is down is your
> first digit, those to the right (6) add up to your right digit.
>
> It's so awesome to watch children light up when they learn something new.
>
> :)
>
> David
>
>
> My kids loved showing their friends this trick.
>
> On Mon, Sep 19, 2011 at 1:55 AM, Arthur Fuller<fuller.artful at gmail.com>wrote:
>
>> Can they multiply yet? There are some cool things about multiplication. I
>> like the elevens especially. 11*11=121. 11*11*11=12121, and so on. The
>> nines
>> are cool, too: take the digits in any multiple of nine and they add up to
>> 9:
>> 18, 27. 36. 45, etc.
>>
>> Arthur
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>>
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