Elementary division rules enable you to quickly determine small factors of a given number. These rules are useful for reduction of fractions and for rapid determination of simple factors.
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- Explaining the Divisibility Rules Proof of the elementary division rules, plus some lesser-known rules for larger divisors and other bases.
- Divisibility Tests From the Furman University Electronic Journal of Undergraduate Mathematics. Apoorva Khare's paper is available as an abstract, DVI, and PostScript.
- Digital Divisibility Tests From Carlos Rivera's Prime Puzzles and Problems collection. Carlos asks for the general divisibility rules for any prime number.