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To get the Greates Common Factor (GCF) of 784 and 864 we need to factor each value first and then we choose all the copies of factors and multiply them:
|784: ||2||2||2||2|| || || || ||7||7|
|864: ||2||2||2||2||2||3||3||3|| || |
|GCF: ||2||2||2||2|| || || || || || |
The Greates Common Factor (GCF) is: 2 x 2 x 2 x 2 = 16