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To get the Greates Common Factor (GCF) of 855 and 225 we need to factor each value first and then we choose all the copies of factors and multiply them:
|855: ||3||3||5|| ||19|
|225: ||3||3||5||5|| |
|GCF: ||3||3||5|| || |
The Greates Common Factor (GCF) is: 3 x 3 x 5 = 45