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To get the Greates Common Factor (GCF) of 1650 and 220 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1650: ||2|| ||3||5||5||11|
|220: ||2||2|| ||5|| ||11|
|GCF: ||2|| || ||5|| ||11|
The Greates Common Factor (GCF) is: 2 x 5 x 11 = 110