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To get the Greates Common Factor (GCF) of 490 and 1794 we need to factor each value first and then we choose all the copies of factors and multiply them:
|490: ||2|| ||5||7||7|| || |
|1794: ||2||3|| || || ||13||23|
|GCF: ||2|| || || || || || |
The Greates Common Factor (GCF) is: 2