# Greatest Common Factor (GCF) of 15 and 42

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To get the Greates Common Factor (GCF) of 15 and 42 we need to factor each value first and then we choose all the copies of factors and multiply them:

 15: 3 5 42: 2 3 7 GCF: 3

The Greates Common Factor (GCF) is: 3

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