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To get the Greates Common Factor (GCF) of 35 and 9999999 we need to factor each value first and then we choose all the copies of factors and multiply them:
|35: || || ||5||7|| || |
|9999999: ||3||3|| || ||239||4649|
|GCF: || || || || || || |
The Greates Common Factor (GCF) is: 1