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To get the Greates Common Factor (GCF) of 684 and 996 we need to factor each value first and then we choose all the copies of factors and multiply them:
|684: ||2||2||3||3||19|| |
|996: ||2||2||3|| || ||83|
|GCF: ||2||2||3|| || || |
The Greates Common Factor (GCF) is: 2 x 2 x 3 = 12