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To get the Greates Common Factor (GCF) of 5145 and 378 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|
|378: ||2||3||3||3|| ||7|| || |
|GCF: || ||3|| || || ||7|| || |
The Greates Common Factor (GCF) is: 3 x 7 = 21