I found an answer from www.qalaxia.com

is the GCF of any two odd numbers is always odd - Qalaxia

Yup, it is!Odd numbers end with a 1,3,5,7,9 none of these numbers can be divided by an even number.GCF is about finding greatest common factors.

For more information, see is the GCF of any two odd numbers is always odd - Qalaxia

I found an answer from www.ducksters.com

Kids Math: Simplifying and Reducing Fractions

There isn't any whole number, other than 1, that both 2 and 3 can be divided ... the two; Divide the numerator and denominator by the greatest common factor ...

For more information, see Kids Math: Simplifying and Reducing Fractions

I found an answer from en.wikipedia.org

Greatest common divisor - Wikipedia

So the two pairs (a, b) and (b, c) have the same common divisors, and thus gcd(a,b) = gcd(b,c). Moreover, as a and b are both odd, c is even, the process can be ...

For more information, see Greatest common divisor - Wikipedia

I found an answer from www.quora.com

Is the greatest common factor if an odd number and an even number ...

No. Indeed it is never even, since odd numbers don't have even factors. On the other hand, the least common multiple of an odd number and ...

For more information, see Is the greatest common factor if an odd number and an even number ...