A divisibility rule is a shorthand way of discovering whether a given number is divisible by a fixed divisor without performing the division, usually by examining its digits. Although there are divisibility tests for numbers in any radix, and they are all different, this article presents rules and examples only for decimal numbers.
Read more about Divisibility Rule: Divisibility Rules For Numbers 1–20, Generalized Divisibility Rule
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“Human beings tolerate what they understand they have to tolerate.”
—Jane Rule (b. 1931)
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