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To get the Greates Common Factor (GCF) of 164 and 423 we need to factor each value first and then we choose all the copies of factors and multiply them:
|164: ||2||2|| || ||41|| |
|423: || || ||3||3|| ||47|
|GCF: || || || || || || |
The Greates Common Factor (GCF) is: 1