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To get the Greates Common Factor (GCF) of 90 and 459 we need to factor each value first and then we choose all the copies of factors and multiply them:
|90: ||2||3||3|| ||5|| |
|459: || ||3||3||3|| ||17|
|GCF: || ||3||3|| || || |
The Greates Common Factor (GCF) is: 3 x 3 = 9