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To get the Greates Common Factor (GCF) of 308 and 3430 we need to factor each value first and then we choose all the copies of factors and multiply them:
|308: ||2||2|| ||7|| || ||11|
|3430: ||2|| ||5||7||7||7|| |
|GCF: ||2|| || ||7|| || || |
The Greates Common Factor (GCF) is: 2 x 7 = 14