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To get the Greates Common Factor (GCF) of 15000 and 225 we need to factor each value first and then we choose all the copies of factors and multiply them:
|15000: ||2||2||2||3|| ||5||5||5||5|
|225: || || || ||3||3||5||5|| || |
|GCF: || || || ||3|| ||5||5|| || |
The Greates Common Factor (GCF) is: 3 x 5 x 5 = 75