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
The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers. The greatest common factor of 80, 90, and 110 is 10.
6
30
9
It is: 10
The Greatest Common Factor (GCF) is: 9
95 and 90's highest common factor is five.
hcf(6, 90) = 6.
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.