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If the GCF of two numbers is 9, why must both numbers be a multiple of 9? Explain
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If the GCF of two numbers is 9, why must both numbers be a multiple of 9? Explain

User Ivan Bacher
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Because 9 has to go into each number, if it doesn't, then it can't be a factor, nor great common factor
User Armand DOHM
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