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To get the Greates Common Factor (GCF) of 9900 and 3120 we need to factor each value first and then we choose all the copies of factors and multiply them:
|9900: ||2||2|| || ||3||3||5||5||11|| |
|3120: ||2||2||2||2||3|| ||5|| || ||13|
|GCF: ||2||2|| || ||3|| ||5|| || || |
The Greates Common Factor (GCF) is: 2 x 2 x 3 x 5 = 60