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To get the Greates Common Factor (GCF) of 825 and 216 we need to factor each value first and then we choose all the copies of factors and multiply them:
|825: || || || ||3|| || ||5||5||11|
|216: ||2||2||2||3||3||3|| || || |
|GCF: || || || ||3|| || || || || |
The Greates Common Factor (GCF) is: 3