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To get the Greates Common Factor (GCF) of 225 and 7500 we need to factor each value first and then we choose all the copies of factors and multiply them:
|225: || || ||3||3||5||5|| || |
|7500: ||2||2||3|| ||5||5||5||5|
|GCF: || || ||3|| ||5||5|| || |
The Greates Common Factor (GCF) is: 3 x 5 x 5 = 75