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To get the Greates Common Factor (GCF) of 170 and 1800 we need to factor each value first and then we choose all the copies of factors and multiply them:
|170: ||2|| || || || ||5|| ||17|
|1800: ||2||2||2||3||3||5||5|| |
|GCF: ||2|| || || || ||5|| || |
The Greates Common Factor (GCF) is: 2 x 5 = 10