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To get the Greates Common Factor (GCF) of 3240 and 90 we need to factor each value first and then we choose all the copies of factors and multiply them:
|90: ||2|| || ||3||3|| || ||5|
|GCF: ||2|| || ||3||3|| || ||5|
The Greates Common Factor (GCF) is: 2 x 3 x 3 x 5 = 90