15. Cause it would be 15x5=75. And the common factor can't be higher than the lowest number. The factors of 15 are 15&1, 5&3. The factors of 75 are 75&1, 25&3, 15&5.(I think that's all) then the highest is the #15. **************[[If I'm wrong someone correct me, please!!]]
Chat with our AI personalities
Factors of 15: 1, 3, 5, 15Factors of 75: 1, 3, 5, 15, 25, 75GCF (15, 75) = 15
The highest common factor of 60 and 75 is 15
90 and 75's highest common factor is 15.
The greatest common factor of the numbers 45, 75 and 90 is 15.
The GCF is 15.