Defeated by Excel

Ok, what the heck? Excel can do all these complicated functions but it can't freaking do division? I looked up websites, tried many help articles, and every function I've tried has some sort of error. I get the ## or the wrong value. Help? All I'm trying to do is divide the points earned column by the points possible column.

WHY am I still awake??? Oh yeah, school stress :P It's not fair that I don't get a weekend.