Fx-991EX The New Classroom Standard With High-resolution LCD Technology ClassWiz has intuitive operability and high performance functions, so ideal for education. Intuitive and interactive operation makes it easy to use the features of ClassWiz. By the use of icons, selection of the desired function is quick and easy. Visual, interactive and textbook-based displays make operation easier for teaching the use of scientific calculators, so you can concentrate on teaching mathematics. Simple key strokes and visualized formulas make calculations faster. Fast calculation for smooth performance in class or during examinations.