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What makes these two math tricks work?
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08-28-2016, 01:02 PM
Leo Bloom
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Join Date: Jun 2009
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Posts: 11,694
"Casting out nines": Wolfram Math:
http://mathworld.wolfram.com/CastingOutNines.html
For a mess of them:
"Divisibility tests": Wolfram Math:
http://mathworld.wolfram.com/DivisibilityTests.html
Last edited by Leo Bloom; 08-28-2016 at
01:02 PM
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