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To get the Greates Common Factor (GCF) of 280 and 25000 we need to factor each value first and then we choose all the copies of factors and multiply them:
|280: ||2||2||2||5|| || || || ||7|
|25000: ||2||2||2||5||5||5||5||5|| |
|GCF: ||2||2||2||5|| || || || || |
The Greates Common Factor (GCF) is: 2 x 2 x 2 x 5 = 40