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To get the Greates Common Factor (GCF) of 540 and 642 we need to factor each value first and then we choose all the copies of factors and multiply them:
|540: ||2||2||3||3||3||5|| |
|642: ||2|| ||3|| || || ||107|
|GCF: ||2|| ||3|| || || || |
The Greates Common Factor (GCF) is: 2 x 3 = 6