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To get the Greates Common Factor (GCF) of 1040 and 728 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1040: ||2||2||2||2||5|| ||13|
|728: ||2||2||2|| || ||7||13|
|GCF: ||2||2||2|| || || ||13|
The Greates Common Factor (GCF) is: 2 x 2 x 2 x 13 = 104