# Greatest Common Factor (GCF) of 45 and 72

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To get the Greates Common Factor (GCF) of 45 and 72 we need to factor each value first and then we choose all the copies of factors and multiply them:

 45: 3 3 5 72: 2 2 2 3 3 GCF: 3 3

The Greates Common Factor (GCF) is: 3 x 3 = 9

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