Scientific calculator 300 plus, 991 is the calculator for students and engineering student. Calculator 991 plus provides powerful functions in a real calculator 991 300 . It makes advanced calculator 991 become the most useful calculator for university and school. Application includes some calculators inside: - Basic calculator 300 plus - Advanced calculator 115 plus - Scientific calculator 991 - Scientific calculator 991 plus - Graphing calculator 84 plus Let's see some special features: ◉ Basic calculator 300 plus and 115 plus: supports from basic mathematics to advanced math functions: percentage, powers, roots, trigonometric, logarithms calculator. Fraction calculation 991 supports convert fraction to decimal, mixed fraction and solve fractions problems. ◉ Advanced calculator 115 plus: combines of hyper calculator and simple scientific calc. This calculator is a multi-functional advanced calculator 991 with all features in one app. Such as linear algebra, calculus...