Highest prime factor, indeed only prime factor, is 5
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The GCF is 25.
The prime factors of 125 are 5x5x5. The highest proper factor is 25.
The GCF is 25.
The Greatest Common Factor (GCF) is: 5
That would be 15. Only a number ending in five would be a factor of 75. 45 is not. 35 is not. 25 is not. 15 is, and it also is a factor of 90. This makes it the highest common factor of 75 and 90, although it is not a prime factor.