A rule is:

Digital Divisibility Tests - From Carlos Rivera's Prime Puzzles and Problems collection. Carlos asks for the general divisibility rules for any prime number.
Divisibility Criteria - Ways of telling whether one number divides another without actually carrying the division through, constructed here in terms of the digits of the number.
Divisibility Tests - Jim Loy explains the divisibility rules up to 11, including a detailed study of 7.
Divisibility Tests - From the NRICH Maths Project Cambridge, England. Dr. Tim Rowland explains the smaller rules and looks at the rules to 7, 11, 13, and 19.
Meta Description: [ Tim Rowland takes the reader through divisibility tests and how
they work. An article to read with pencil and paper to hand. ]
Divisibility Tests - From the Furman University Electronic Journal of Undergraduate Mathematics. Apoorva Khare's paper is available as an abstract, DVI, and PostScript.
Divisibility War - A card game to teach divisibility rules.
Explaining the Divisibility Rules - Proof of the elementary division rules, plus some lesser-known rules for larger divisors and other bases.
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The Anti-Divisor - Introduction to unbiased non-divisor and using it in mathematical proofs.
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