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To get the Greates Common Factor (GCF) of 540 and 2205 we need to factor each value first and then we choose all the copies of factors and multiply them:
|540: ||2||2||3||3||3||5|| || |
|2205: || || ||3||3|| ||5||7||7|
|GCF: || || ||3||3|| ||5|| || |
The Greates Common Factor (GCF) is: 3 x 3 x 5 = 45