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To get the Greates Common Factor (GCF) of 1222 and 78 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1222: ||2|| ||13||47|
|78: ||2||3||13|| |
|GCF: ||2|| ||13|| |
The Greates Common Factor (GCF) is: 2 x 13 = 26