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To get the Greates Common Factor (GCF) of 555 and 1480 we need to factor each value first and then we choose all the copies of factors and multiply them:
|555: || || || ||3||5||37|
|1480: ||2||2||2|| ||5||37|
|GCF: || || || || ||5||37|
The Greates Common Factor (GCF) is: 5 x 37 = 185