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To find the greatest common factor of two numbers just type them in and get the solution.

To get the Greates Common Factor (GCF) of 21875 and 28000 we need to factor each value first and then we choose all the copies of factors and multiply them:

21875: | 5 | 5 | 5 | 5 | 5 | 7 | |||||

28000: | 2 | 2 | 2 | 2 | 2 | 5 | 5 | 5 | 7 | ||

GCF: | 5 | 5 | 5 | 7 |

**The Greates Common Factor (GCF) is: 5 x 5 x 5 x 7 = 875**

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