We talk about calculus enough in here, and have made a few jokes about its use beyond the classroom. At my undergrad university, either calculus or formal logic could be used to fulfill one of the liberal arts requirements. In other words, the value of calculus was seen not in being able to derive anything, but in following steps to make an analysis. How do you use your math background? Using simple algebra to calculate exposed area per volume of remaining cake could be one way to test out this method of cake cutting. Where else is math handy for you, and what level math do you use most often?