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To get the Greates Common Factor (GCF) of 1170 and 1625 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1170: ||2||3||3||5|| || ||13|
|1625: || || || ||5||5||5||13|
|GCF: || || || ||5|| || ||13|
The Greates Common Factor (GCF) is: 5 x 13 = 65