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To get the Greates Common Factor (GCF) of 990 and 625 we need to factor each value first and then we choose all the copies of factors and multiply them:
|990: ||2||3||3||5|| || || ||11|
|625: || || || ||5||5||5||5|| |
|GCF: || || || ||5|| || || || |
The Greates Common Factor (GCF) is: 5