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To get the Greates Common Factor (GCF) of 336 and 2240 we need to factor each value first and then we choose all the copies of factors and multiply them:
|336: ||2||2||2||2|| || ||3|| ||7|
|2240: ||2||2||2||2||2||2|| ||5||7|
|GCF: ||2||2||2||2|| || || || ||7|
The Greates Common Factor (GCF) is: 2 x 2 x 2 x 2 x 7 = 112