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To get the Greates Common Factor (GCF) of 8680 and 100 we need to factor each value first and then we choose all the copies of factors and multiply them:
|8680: ||2||2||2||5|| ||7||31|
|100: ||2||2|| ||5||5|| || |
|GCF: ||2||2|| ||5|| || || |
The Greates Common Factor (GCF) is: 2 x 2 x 5 = 20