The courses in our department focus on the theory, application and presentation of mathematics, and are not specifically designed to enable you to use a calculator. Nonetheless, we often suggest or insist that you buy a calculator because we believe it will help you learn better. We want you to interact with it to try pertinent examples which will help you learn ideas better; we want to give you more realistic applications involving very large numbers or many digits of accuracy; and we want to allow you to focus on the analysis of your problems without having to grind through calculations you have already practiced for a long time. On the other hand, we don't want you to think that mathematics consists only of grinding out computations, and we don't want to deny you the practice with skills you'll need later; so we often requre you to work things by hand, in steps, and explain what you have learned.