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To get the Greates Common Factor (GCF) of 756 and 700 we need to factor each value first and then we choose all the copies of factors and multiply them:
|756: ||2||2||3||3||3|| || ||7|
|700: ||2||2|| || || ||5||5||7|
|GCF: ||2||2|| || || || || ||7|
The Greates Common Factor (GCF) is: 2 x 2 x 7 = 28