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To get the Greates Common Factor (GCF) of 860 and 800 we need to factor each value first and then we choose all the copies of factors and multiply them:
|860: ||2||2|| || || ||5|| ||43|
|800: ||2||2||2||2||2||5||5|| |
|GCF: ||2||2|| || || ||5|| || |
The Greates Common Factor (GCF) is: 2 x 2 x 5 = 20