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To get the Greates Common Factor (GCF) of 7840 and 630 we need to factor each value first and then we choose all the copies of factors and multiply them:
|7840: ||2||2||2||2||2|| || ||5||7||7|
|630: ||2|| || || || ||3||3||5||7|| |
|GCF: ||2|| || || || || || ||5||7|| |
The Greates Common Factor (GCF) is: 2 x 5 x 7 = 70