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To get the Greates Common Factor (GCF) of 1380 and 5175 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1380: ||2||2||3|| ||5|| ||23|
|5175: || || ||3||3||5||5||23|
|GCF: || || ||3|| ||5|| ||23|
The Greates Common Factor (GCF) is: 3 x 5 x 23 = 345