HP3000-L Archives

December 1999, Week 1

HP3000-L@RAVEN.UTC.EDU

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Subject:
From:
Tony Summers <[log in to unmask]>
Reply To:
Tony Summers <[log in to unmask]>
Date:
Fri, 3 Dec 1999 13:55:06 +0000
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Can anyone explain why the works?  I know that any number multiplied by 9
gives a number whose digits add up to 9, but why?

And even better 

http://www.cut-the-knot.com/blue/divisibility.html

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