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To get the Greates Common Factor (GCF) of 3300 and 255 we need to factor each value first and then we choose all the copies of factors and multiply them:
|3300: ||2||2||3||5||5||11|| |
|255: || || ||3||5|| || ||17|
|GCF: || || ||3||5|| || || |
The Greates Common Factor (GCF) is: 3 x 5 = 15