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To get the Greates Common Factor (GCF) of 54 and 864 we need to factor each value first and then we choose all the copies of factors and multiply them:
|54: ||2|| || || || ||3||3||3|
|GCF: ||2|| || || || ||3||3||3|
The Greates Common Factor (GCF) is: 2 x 3 x 3 x 3 = 54