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To get the Greates Common Factor (GCF) of 990 and 30870 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|
|30870: ||2||3||3||5||7||7||7|| |
|GCF: ||2||3||3||5|| || || || |
The Greates Common Factor (GCF) is: 2 x 3 x 3 x 5 = 90