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To get the Greates Common Factor (GCF) of 7150 and 780 we need to factor each value first and then we choose all the copies of factors and multiply them:
|7150: ||2|| || ||5||5||11||13|
|780: ||2||2||3||5|| || ||13|
|GCF: ||2|| || ||5|| || ||13|
The Greates Common Factor (GCF) is: 2 x 5 x 13 = 130