# Greatest Common Factor (GCF) of 63 and 81

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To get the Greates Common Factor (GCF) of 63 and 81 we need to factor each value first and then we choose all the copies of factors and multiply them:

 63: 3 3 7 81: 3 3 3 3 GCF: 3 3

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

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