10
obviously, its highest common factor is the number itself. so the answer here is 90.
The Greatest Common Factor of 80, 85, 90: 5
90
It is: 10
30
9
6
The Greatest Common Factor (GCF) is: 9
hcf(6, 90) = 6.
95 and 90's highest common factor is five.
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.
The LCM (lowest common factor) of 80 85 90 excluding one is 5.