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To get the Greates Common Factor (GCF) of 10 and 1275 we need to factor each value first and then we choose all the copies of factors and multiply them:
|10: ||2|| ||5|| || |
|1275: || ||3||5||5||17|
|GCF: || || ||5|| || |
The Greates Common Factor (GCF) is: 5