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To get the Greates Common Factor (GCF) of 3256 and 999 we need to factor each value first and then we choose all the copies of factors and multiply them:
|3256: ||2||2||2|| || || ||11||37|
|999: || || || ||3||3||3|| ||37|
|GCF: || || || || || || || ||37|
The Greates Common Factor (GCF) is: 37