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To get the Greates Common Factor (GCF) of 213 and 660 we need to factor each value first and then we choose all the copies of factors and multiply them:
|213: || || ||3|| || ||71|
|660: ||2||2||3||5||11|| |
|GCF: || || ||3|| || || |
The Greates Common Factor (GCF) is: 3