Part A
[tex] \frac{3}{8} < \frac{3}{6} < \frac{4}{6} [/tex]
Part B
I found this by multiplying the fractions so all the denominators are the same (9/24, 12/24, 16/24) and I can tell which one is the smallest just by looking at it.
Hope this helped! If you have anymore questions or don't understand, please comment or DM me. :)