Greatest Common Factor (GCF) of 15 and 45

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To get the Greates Common Factor (GCF) of 15 and 45 we need to factor each value first and then we choose all the copies of factors and multiply them:

15:   3 5
45:   335
GCF:   3 5

The Greates Common Factor (GCF) is:   3 x 5 = 15

 

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