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A divisibility rule is a shorthand way of determining whether a given number is divisible by a fixed divisor without performing the division, usually by examining its digits. Below are divisibility rules for numbers 1 through 20. This chart and printable guide were compiled and prepared by Gregory Tewksbury, a co-founder of Calculus Humor!
Attached is also a printable pdf of these rules! Feel free to use for personal use or classroom use only!
This started as a way to express the admins' love of calculus and math in general. As result, this has turned into a gathering place for math-based humor and weekly challenges.
This work by Calculus Humor is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.