CASIO fx-991 ES Plus (Version 2) Standard Non Programmable Scientific Calculator - (Black) 3 Years Warranty

Simple and easy to use

Optimal education tools realized through s design that emphasizes comfort in the hand, legibility, and usability through the pursuit of simplicity

Natural Textbook Display

Features Natural Textbook Display format for displaying equations and calculation result just as they appear in textbooks

Authentic quality

Excellent quality and authentication ensure confidence and peace of mind for use in educational settings

Main functions

Random integers

Fraction calculations

Combination and permutation

Statistics (List-based STAT data editor, standard deviation, regression analysis)

9 variables

Table function

Comes with new slide-on hard case

Equation calculations

Integration/differential calculations

Matrix calculations

Vector calculations

Complex number calculations

CALC function

SOLVE function

Base-n calculation

Integration

Complex number calculations

Differential

Vector

Matrix operations

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Specifications

Basic Information

• Product features

Non Programmable

Non Graphing

Number of Functions : 417

• Product type

Non Programmable

Non Graphing

• Number of digits

10 + 2 digits

• Liquid crystal display

Natural textbook display

Dot matrix display

• Key characteristics

Plastic keys

• Key functions

Negative Sign

Power Off

• Memory

Variables: 9

Independent Memory (M / M+ / M-)

Answer Memory

Memory Protection

Reset Function

• Power supply

Solar & Battery

Approximate battery life Main 3 years

Auto Power Off

• Size (D × W × H)

161.5 × 77 × 11.1 mm

• Weight

95 g

• Accessories

Hard Case

• Display format settings

Number Format: Fix

Number Format: Sci

Number Format: Norm

Engineering Notation

Toggling Calculation Results

Calculation Functions

• Basic calculation

Basic Calculation

Bracket Calculation

Fraction Calculation

Degree, Minute, Secound (Sexagesimal) Calculations

Reciprocal Calculation

Percent Calculation (scientific calculator function)

Factorial Function

π

Calculation with √ and π

Rounding Function

• Advanced calculation

Transcendental number: e

Base-n calculation

Logical Operators

Complex number calculation

Matrix calculations

Vector calculations

Differential calculation

Integration calculation

• Applied calculation

Multi-statement Command (:)

Continuous Calculation

Replay Function

Multi-replay Function

CALC Function

SOLVE Function

Functions Features

• Basic functions

Basic Mathematical Functions

Number of Functions : 417

Absolute Value Calculation

Power Function (Square)

Power Function (Cube)

Power Function

Power Function (Square Root)

Trigonometric Function

Inverse Trigonometric Function

Hyperbolic / Inverse Hyperbolic Function

Exponential Calculation

Logarithmic Calculation

Log not base 10

Coordinate Conversion

Combination / Permutation

Random Number Generation

Random Integer Generation

Summation

• Other functions

Equation

• Physics- and chemistry-related functions

Scientific Constants

Metric conversion function

Statistical Functions

• Statistical data

List based STAT-data editor

• Statistical calculation

Statistics Function

Basic Statistics