Since 25 is a factor of 50, it automatically has to be the GCF. Here's how you find it. Factor them.
5 x 5 = 25
2 x 5 x 5 = 50
Select the common factors.
5 x 5 = 25, the GCF.
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The greatest common factor of 25 and 76 is 1.
The greatest common factor of 100 and 275 is 25.
The Greatest Common Factor (GCF) is: 25
The greatest common factor of 75 and 125 is 25
The Greatest Common Factor of 50, 25, 26 is 1