The Casio FX991ES has 403 functions and, the revolutionary Natural Textbook Display allow you to enter expressions as seen in your text books.

The FX991ES is ideal for both students and professionals because it has advanced mathematical functions

Recommended for GCSE & A/AS Level (England & Wales.
Junior & Leaving Certificate (Eire).
Standard & Higher Grade (Scotland).

Features:
- Natural Textbook Display.
- Table of a function.
- Statistical Data Entry List-based.
- Multi replay.
- Slide on hard plastic case.
- Ideal for Keystages 3 & 4 and above. Age 11-16+
- Power Solar/Battery.

Specifications:
- Natural Textbook Display.
- Display TwinLine LCD DOT MATRIX.
- Keystages Suitable For 3, 4, & above.
- Suitable for (ages) 11 plus.
- No. of functions 403.
- Keyboard material Plastic.
- Mantissa + EXP 12 + 2.
- Power supply Solar/LR44 Battery.
- Auto power off.
- Battery life 3 years.
- Case Slide-on.
- Memories 7.
- Parenthese 24.
- Multi-replay.
- Reset.
- Dimensions (mm) 12.2 x 80 x 161.
- Weight (g) 105.
- Packaging Blister card.
- Degrees.
- Radians.
- Gradians.
- % Function.
- Square root.
- Fractions.
- Trigonometrics (SIN/COS/TAN).
- Logarithm.
- Roots & powers - Exponents.
- Reciprocals.
- Coordinate conversion.
- Degrees/minutes/seconds.
- Negative Indicator.
- Hyperbolics.
- Table of a function.
- Expression editing.
- Backspace/delete.
- FIX/SCI/ENG.
- Complex numbers.
- Logic Operations.
- DEC/HEX/BIN/OCT conversions.
- Numeric Differentiation.
- Numeric integration.
- Formula Solver.
- Equation Solver.
- Scientific Constants 40.
- Metric / Imperial Conversions 40.
- Matrices.
- Vectors.
- Factorials.
- Combinations.
- Permutations.
- Standard deviation.
- Linear Regression.
- Logarithmic regression.
- Exponential regression.
- Power regression.
- Quadratic regression.
- Inverse regression.
- Random numbers.
- Normal Distribution.
- Statistics Data Editor List-based.