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MathMentor

Learn with Mentor · 8 min

Divisibility Rules

Use digit-sum, last-digit, and last-digits rules to decide quickly whether a whole number is divisible by 2, 3, 4, 5, 6, 8, 9, or 10.

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Quick tests

A divisibility rule tells you whether one whole number divides another exactly. The rule is faster than long division, but the final answer still needs a clear Yes or No.