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To get the Greates Common Factor (GCF) of 287 and 4020 we need to factor each value first and then we choose all the copies of factors and multiply them:
|287: || || || || ||7||41|| |
|4020: ||2||2||3||5|| || ||67|
|GCF: || || || || || || || |
The Greates Common Factor (GCF) is: 1