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To get the Greates Common Factor (GCF) of 98 and 2040 we need to factor each value first and then we choose all the copies of factors and multiply them:
|98: ||2|| || || || ||7||7|| |
|2040: ||2||2||2||3||5|| || ||17|
|GCF: ||2|| || || || || || || |
The Greates Common Factor (GCF) is: 2