Casio FX-100MS Scientific Calculator Many different people may need to use calculators depending on the daily tasks they face. Students often need them for schoolwork. Adults find them handy to have around the house or in a purse or briefcase for many reasons, including paying bills and balancing the checkbook. Office workers, especially in the finance and accounting fields, need them to calculate different things on a daily basis. The casio desk calculator comes in handy for all your multiple purposes and it's various features makes it easy to use . Casio adds fun and convenience to daily life. The brand is known for setting new trends.