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To get the Greates Common Factor (GCF) of 430 and 1075 we need to factor each value first and then we choose all the copies of factors and multiply them:
|430: ||2||5|| ||43|
|1075: || ||5||5||43|
|GCF: || ||5|| ||43|
The Greates Common Factor (GCF) is: 5 x 43 = 215