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To get the Greates Common Factor (GCF) of 840 and 1925 we need to factor each value first and then we choose all the copies of factors and multiply them:
|840: ||2||2||2||3||5|| ||7|| |
|1925: || || || || ||5||5||7||11|
|GCF: || || || || ||5|| ||7|| |
The Greates Common Factor (GCF) is: 5 x 7 = 35