## Description

**Casio Scientific Calculator FX991ex Classwiz Original**

Presentation

Functions

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**Specifications**

- Number of Functions: 552
- Two-way power (Solar + LR44 × 1)
- Approximate battery life: 2 years (LR44)
^{*1} - Dimensions H × W × D (mm): 11.1 × 77 × 165.5
- Approximate weight (g): 90
- Case style: Slide-on hard
- Dot matrix display: 192 × 63 dots
- Mantissa + exponent digits: 10 + 2
- Internal operation digits: 15
- Nested parentheses levels: 24

**Utilities**

- Natural textbook display / NATURAL-V.P.A.M.
- Key rollover function
- Replay function
- Multi-replay functions
- Backspace
- CALC function
- SOLVE function
- Answer function
- Variables:9
- Auto power off
- UNDO
- Digit separator
- Multiline display

**Special Features**

- Base-n calculations (Binary/Octal/Hexadecimal)
- Logical operations
- Engineering symbol calculations
- Engineering notation (ENG/ENG)
- Scientific constants : 47
- Metric conversions : 40

**Basic Functions**

- Trigonometric, inverse trigonometric (sin/cos/tan/sin
^{-1}/cos^{-1}/tan^{-1}) - Hyperbolic, inverse hyperbolic (sinh/cosh/tanh/sinh
^{-1}/cosh^{-1}/tanh^{-1}) - Exponential, logarithmic (log, ln, 10
^{x}, e^{x}) - Base specified logarithmic
- Square and square root (x
^{2}/ √ ) - Cubic and cubic root (x
^{3}/^{3}√ ) - Power and radical root (x
^{y}/ x√ ) - Fraction
- Percentage calculation (%)
- Rounding
- Sexagesimal ↔ decimal
- Display format (FIX, SCI)
- Angle unit (Degree, Radian, Gradian)
- Angle unit conversion (Degree, Radian, Gradian)
- Factorization into prime factors
- Ratio calculation

**Calculus**

- Differentiation calculation
- Integration calculation

**Algebra**

- Simultaneous equation : (4 unknowns)
- Polynomial equation : (Degree 2, 3, 4)
- Inequality calculation
- Table function
- Matrix calculations
- Complex number calculation

**Geometry**

- Coordinate conversion (Pol, Rec)
- Vector calculations

**Probability**

- Combination, permutation (nCr, nPr)

**Statistics**

- Random numbers
- Random integers
- List-based STAT data editor
- Standard deviation
- Regression analysis
- Linear regression
- ab exponential regression
- Other regression: Log, Exp, Pwr, Inv, Quad
- Advanced statistical distribution calculations

**Spreadsheet**

**QR code**

**Features Overview**

*High Resolution Display*

The new ClassWiz features a high-resolution display making it easier to view numerical formulas and symbols.

*“Resolution 4x”*

- New Icon Display
- Innovative input method
- List Display

The new ClassWiz makes it possible to display on the screen twice the number of characters in normal size and six times the number in small size compared with previous models.

*High-resolution LCD drives further evolution!*

Higher resolution increases the amount of information that can be displayed and improves usability. In addition, ClassWiz is equipped with a basic spreadsheet function for creating spreadsheets with up to 5 columns and 45 rows (maximum of 170 data items).

ClassWiz technology has the power to change mathematics classroom

*Easy to Use*

Superb usability that takes full advantage of the improved display capabilities makes the interface easy to use in classrooms

**Intuitive Icon Display**

The use of icons on the menu screen improves viewability.

Selection of the desired function is quick and easy.**Unabbreviated English Display**

Nearly all English words are displayed on the screen in unabbreviated form.

*Messages are spelled out (not abbreviated)**Interactive format**

Interactive menu display realizes more intuitive operation.**Natural Textbook Display**

Input and display fractions, powers, logarithms, roots, and other mathematical formulas and symbols just as they appear in textbooks.

*Newly designed body for the best use of calculation*

Featuring intelligent design and an elegant texture

**Special surface processing**

A special surface process applied to the body results in an elegant texture and design.- Metallic keys (fx-991EX/570EX only)

The stylish look and feel of metal imparts a sense of luxury. **Key functions arranged by color**

The functions assigned to keys are color-coded to facilitate key operation.**Easy-to-understand key notation**

The key notation, like the display format, uses signs and symbols like those found in mathematics textbooks. This natural interface makes input fast and easy.

**Comes with slide-on hard case**

**Thin rounded body**

The thin, smoothly rounded body fits the hand perfectly.

*Easy to Study*

A High-performance processor and twice the memory of previous models ensure speedy operation and superior computational power.

**High-resolution display**

192 × 63-dot display.

Clear display of equations and messages**High-speed calculation**

Fast calculation for smooth performance in class or during examinations**Data capacity for Statistics**

Capacity to process 160 statistical data items**High-performance functions**- Use of spreadsheets
- 4 × 4 matrix calculation

*List display function for thorough, speedy learning*

Variables and statistical calculation results stored in memory can be displayed in lists. There’s no need to recall and confirm individual values as with previous models.

*High computational competence for performing even advanced mathematics*

ClassWiz contains calculation functions that support even advanced mathematical operations, including spreadsheet calculations, 4 X 4 matrix calculations, calculation of simultaneous equations with four unknowns and quartic equations, and advanced statistical distribution calculations.

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