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To get the Greates Common Factor (GCF) of 5145 and 120 we need to factor each value first and then we choose all the copies of factors and multiply them:
|5145: || || || ||3||5||7||7||7|
|120: ||2||2||2||3||5|| || || |
|GCF: || || || ||3||5|| || || |
The Greates Common Factor (GCF) is: 3 x 5 = 15