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To get the Greates Common Factor (GCF) of 912 and 3420 we need to factor each value first and then we choose all the copies of factors and multiply them:
|912: ||2||2||2||2||3|| || ||19|
|3420: ||2||2|| || ||3||3||5||19|
|GCF: ||2||2|| || ||3|| || ||19|
The Greates Common Factor (GCF) is: 2 x 2 x 3 x 19 = 228