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To get the Greates Common Factor (GCF) of 40255 and 56357 we need to factor each value first and then we choose all the copies of factors and multiply them:
|40255: ||5|| ||83||97|
|56357: || ||7||83||97|
|GCF: || || ||83||97|
The Greates Common Factor (GCF) is: 83 x 97 = 8051