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To get the Greates Common Factor (GCF) of 70 and 1400 we need to factor each value first and then we choose all the copies of factors and multiply them:
|70: ||2|| || ||5|| ||7|
|GCF: ||2|| || ||5|| ||7|
The Greates Common Factor (GCF) is: 2 x 5 x 7 = 70