To find the fractions simplest form, we first need to solve for the GCF of the two numbers, 28 & 36. We do this by finding the prime factors.
28=7*2*2
36=3*3*2*2
The numbers have the prime factors of 2*2 in common, therefore the GCF is 4. (2*2=4)
28/4=7 36/4=9
[tex] \frac{28}{36} divided by 4= \frac{7}{9} [/tex]
Answer=7/9