The problem listed here is basic fraction reducement. Super useful.
6/8 can be reduced. To do so, we have to find the greatest common factor of BOTH 6 and 8. In this case, it is 2.
6/2=3, and 8/2=4.
We plug it back in, and now the fraction is 3/4.
Sometimes, the fraction can be simplified again, if you don't use the greatest common factor. However, it's not vital to use it. It's just much faster.
In this case, 3/4 is the most simplified fraction because one of the numbers (3) is a prime number. Prime numbers are numbers who only multiples are itself and one. (Speaking whole numbers.) Since anything divided by one is just itself, this fraction is simplfied.
Final Answer: 3/4
Hope this helps!