It's good to get accustomed to things like making sure you know which is the RS or WS with simpler patterns. As you move on to more complicated things it becomes more important. Working stockinette, the RS will be pretty obvious but you will probably encounter patterns where it's not and if you're at all like me will sit there trying to figure out which side you really are on when you forget to mark it. That's going to be pretty when you're done, what yarn are you using?
I should never overestimate my basic arithmetic skills.