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K-12 Math Problems, Puzzles, Tips & Tricks Why do the divisibility 'rules' work Explaining: 10, 2, 4, 8, 2^k, 5, 25 - by Ask Dr. Math's Robert L. 'Dr. Rob' Ward Divisibility Rules || 3,9,11,7,13,17... || Alternate Test Method || Origin of Many Div. Rules Cindy Smith asks: From: cms@dragon.com (Cindy Smith) To: Dr. Math dr.math@mathforum.org Subject: Factoring Tricks In reading a popular math ...
mathforum.org/k12/mathtips/ward.html
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