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To get the Greates Common Factor (GCF) of 8910 and 34650 we need to factor each value first and then we choose all the copies of factors and multiply them:
|8910: ||2||3||3||3||3||5|| || ||11|
|34650: ||2||3||3|| || ||5||5||7||11|
|GCF: ||2||3||3|| || ||5|| || ||11|
The Greates Common Factor (GCF) is: 2 x 3 x 3 x 5 x 11 = 990