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To get the Greates Common Factor (GCF) of 56 and 765 we need to factor each value first and then we choose all the copies of factors and multiply them:
|56: ||2||2||2|| || || ||7|| |
|765: || || || ||3||3||5|| ||17|
|GCF: || || || || || || || || |
The Greates Common Factor (GCF) is: 1