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To get the Greates Common Factor (GCF) of 988 and 615 we need to factor each value first and then we choose all the copies of factors and multiply them:
|988: ||2||2|| || ||13||19|| |
|615: || || ||3||5|| || ||41|
|GCF: || || || || || || || |
The Greates Common Factor (GCF) is: 1