Enjoy solving mathematical and engineering problems with ease using the original Casio FX-991ES Plus 2 calculator. It features 417 advanced scientific functions and a Natural Textbook Display that shows equations, fractions, and roots just as they appear in textbooks, making it ideal for students, engineers, and teachers. It supports statistical operations, matrices, complex numbers, equation solving, integration, and differentiation, with dual solar and battery power for reliability in all conditions. Practical design with a sliding protective cover and the globally renowned Casio quality.