It's not necessary. Since 25 is a factor of 75, it is automatically the GCF.
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You need at least two numbers to find a GCF. If that's 25 and 200, the GCF is 25.
The GCF is 5.
3 x 5 = 15 2 x 5 x 5 = 50 The GCF is 5.
The GCF is 5.
It depends on the numbers. The GCF of 25 and 26 is 1, but the GCF of 25 and 50 is 25. No matter what, it will be an odd number.