They're useful little things. Even after finals are over, you can still use them for purposes like flinging them at people and doodling. But most of all, you need them for note-taking. Notes are sentences you write on your own to summarize or emphasize certain information in your classes. You're probably going to have to borrow some of these too, so pay attention to the next paragraph so that you will be able to identify them.
Notes are important.
These goofy little sheets whose rustling kept you awake in MATH 100 will now prove infinitely useful in passing your class, and by extension securing future economic prosperity. Here's a great little scam. Ask to borrow their notes. Even if you've been taking notes, chances are that theirs are better than yours. Then run to Kinko's or Campus Copy and run off the whole lot.