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To get the Greates Common Factor (GCF) of 8730 and 3977 we need to factor each value first and then we choose all the copies of factors and multiply them:
|8730: ||2||3||3||5|| ||97|
|3977: || || || || ||41||97|
|GCF: || || || || || ||97|
The Greates Common Factor (GCF) is: 97