Key functions of Casio FX-991ES PLUS:

1. Two-way power
2. 417 Functions
3. Full Dot Display
4. Integration / Differential
5. Equation calculation
6. Matrix calculations / Vector calculations
7. Complex number calculation
8. CALC function / SOLVE function
9. Base-n calculation
10. Fraction calculations
11. Combination and permutation

More Functions of Casio fx-991ES PLUS:

1. Fraction calculation
2. Combination and Permutation
3. Logarithm log
4. List-based STAT data editor
5. Standard deviation
6. Paired-variable statistics regression analysis
7. Logical operations
8. Table function
9. 40 scientific constants
10. 40 metric conversions (20 conversion pairs)
11. 9 variable memories
12. Comes with new slide-on hard case