Revision as of 22:34, 23 February 2009 edit Spring12 (talk \| contribs) 664 edits Adding reference to Dr. Silver, by advice of another user ← Previous edit		Revision as of 22:34, 23 February 2009 edit undo Spring12 (talk \| contribs) 664 edits link to dr silver Next edit →
Line 6: Digit sums can be used for quick [[divisibility rule\|divisibility tests]]: a natural number is divisible by 3 or 9 if and only if its digit sum (or digital root) is divisible by 3 or 9, respectively. In an episode of Good Morning America Now, a Florida Numerologist known as [http://en.wikipedia.org/wiki/Sheree_Silver Dr. Sheree Silver, Ph.D.] used the method to predict the then-Senator Barack Obama would become president of the United States.<ref>http://abcnews.go.com/video/playerIndex?id=4809428</ref> ==External links==

Digit sum: Difference between revisions