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To get the Greates Common Factor (GCF) of 1260 and 189 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1260: ||2||2||3||3|| ||5||7|
|189: || || ||3||3||3|| ||7|
|GCF: || || ||3||3|| || ||7|
The Greates Common Factor (GCF) is: 3 x 3 x 7 = 63