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To get the Greates Common Factor (GCF) of 1002 and 990 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1002: ||2||3|| || || ||167|
|990: ||2||3||3||5||11|| |
|GCF: ||2||3|| || || || |
The Greates Common Factor (GCF) is: 2 x 3 = 6