Greatest Common Factor (GCF) of 280 and 21

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To get the Greates Common Factor (GCF) of 280 and 21 we need to factor each value first and then we choose all the copies of factors and multiply them:

280:   222 57
21:      3 7
GCF:        7

The Greates Common Factor (GCF) is:   7

 

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