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To get the Greates Common Factor (GCF) of 320 and 305 we need to factor each value first and then we choose all the copies of factors and multiply them:
|320: ||2||2||2||2||2||2||5|| |
|305: || || || || || || ||5||61|
|GCF: || || || || || || ||5|| |
The Greates Common Factor (GCF) is: 5