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To get the Greates Common Factor (GCF) of 1680 and 308 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1680: ||2||2||2||2||3||5||7|| |
|308: ||2||2|| || || || ||7||11|
|GCF: ||2||2|| || || || ||7|| |
The Greates Common Factor (GCF) is: 2 x 2 x 7 = 28