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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“There is no rule more invariable than that we are paid for our suspicions by finding what we suspected.”
—Henry David Thoreau (1817–1862)
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