1 and the highest common factor is 4
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The lowest common factor is 1. (The least common factor of any two or more positive integers is always 1.)
The greatest common factor of 32 and 28 is 4. 32/4=8 and 28/4=7. That's as close as you're going to get!
The word "highest" is a superlative and what that means is that there can be only one such number. Si there can be only one highest common factor, not factors.HCF(28, 32) = 4.
7/8
28/32 simplifies to 7/8