Web Directory

» Digital Divisibility Tests
   From Carlos Rivera's Prime Puzzles and Problems collection. Carlos asks for the general divisibility rules for any prime number.
   http://www.primepuzzles.net/puzzles/puzz_101.htm

» 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.
   http://www.cut-the-knot.com/blue/divisibility.html

» Divisibility Tests
   From the Furman University Electronic Journal of Undergraduate Mathematics. Apoorva Khare's paper is available as an abstract, DVI, and PostScript.
   http://math.furman.edu/~mwoodard/fuejum/textv/volume3text.html

» Divisibility War
   A card game to teach divisibility rules.
   http://edweb.sdsu.edu/courses/edtec670/Cardboard/card/d/Divisibility.html

» Explaining the Divisibility Rules
   Proof of the elementary division rules, plus some lesser-known rules for larger divisors and other bases.
   http://mathforum.org/k12/mathtips/ward.html