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To get the Greates Common Factor (GCF) of 345 and 2300 we need to factor each value first and then we choose all the copies of factors and multiply them:
|345: || || ||3||5|| ||23|
|2300: ||2||2|| ||5||5||23|
|GCF: || || || ||5|| ||23|
The Greates Common Factor (GCF) is: 5 x 23 = 115