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To get the Greates Common Factor (GCF) of 366 and 128 we need to factor each value first and then we choose all the copies of factors and multiply them:
|366: ||2|| || || || || || ||3||61|
|128: ||2||2||2||2||2||2||2|| || |
|GCF: ||2|| || || || || || || || |
The Greates Common Factor (GCF) is: 2