When I was in college, students would periodically pull out a calculator to begin crunching numbers to figure out their grade for each class. Of course, I also played the calculator game.
The mental process goes something like, "if I make a B on this test, what minimum grade do I need to earn on the homework assignments to stay at an A average?"
And so go the various scenarios.
Outside of college, where your finances are your grade, I find myself playing the calculator game as well. Except that you focus on things like capital invested, rate of return, desired monthly income, and other geeky financial terms.