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Divisibility Rules Flashcards
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Formula
Div by 15 = ?
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Answer
Must be divisible by BOTH 3 and 5.
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Formula
Div by 18 = ?
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Must be divisible by BOTH 2 and 9.
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Formula
Div by composite number = ?
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Break into coprime factors. Example: 12 = 3 × 4 (coprime), check both.
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