Casio FX-300ES Overhead Calculator

It has a 2-line display that shows formulas and results simultaneously. It also has 229 built in mathematic functions, including fractions, statistics, standard deviation, linear regression, and polar-rectangular conversion. The keys are hard, plastic, round-cornered and tamper proof. The fraction keys allows entry and calculation of fractions. It converts between mixed and improper fractions and converts fractions to their decimal equivalents.