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To get the Greates Common Factor (GCF) of 990 and 405 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|
|405: || ||3||3||3||3||5|| |
|GCF: || ||3||3|| || ||5|| |
The Greates Common Factor (GCF) is: 3 x 3 x 5 = 45