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To get the Greates Common Factor (GCF) of 790 and 909 we need to factor each value first and then we choose all the copies of factors and multiply them:
|790: ||2|| || ||5||79|| |
|909: || ||3||3|| || ||101|
|GCF: || || || || || || |
The Greates Common Factor (GCF) is: 1