The calculator 991 ex contains following features:
The most power scientific calculator 36 pro supports matrix and vector calculation, math, number, sin cos tan

Advanced calculator 36 provides set of advanced features for engineering students such as equation solver, integral, integer, derivative, system equations solver, prime factor.

Engineering calculator 36 is a useful instruments for students. This calculator is designed same as calculator 30, calculator 36 pro x, calculator 84
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

You can write expressions in a natural way and watch your calculations. The result is displayed as a number, simplified expression etc.