Greatest Common Factor (GCF) of 400 and 645

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To get the Greates Common Factor (GCF) of 400 and 645 we need to factor each value first and then we choose all the copies of factors and multiply them:

400:   2222 55 
645:       35 43
GCF:        5  

The Greates Common Factor (GCF) is:   5

 

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