On Thu, 2 Oct 1997 CoolMath2@AOL.COM wrote:
>
> Let's see if I can even describe it well ------
> Take the sum of the digits that are in places that are even powers of 10 and
> subtract the sum of the digits that are odd powers of 10. If the result is
> divisible by 11, then the original number is divisible by 11.
>
> I'd better give an example!
>
> Does 11 divide 28374957?
>
> (7+9+7+8) - (5+4+3+2) = 17 , 11 does not divide 17 so 11 does not divide
> that big number we started with! 8-)
>
> Karen
> Orange Coast College
> http://members.aol.com/coolmath2/coomath.htm
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