CASIO Fx-991EX Standard Scientific Calculators

Product features
Non Programmable
Non Graphing
Number of Functions : 552
Product type
Non Programmable
Non Graphing
Number of digits
10 + 2 digits
Liquid crystal display
3-digit comma markers
Natural textbook display
Icon menu
Dot matrix display
High Resolution
Key characteristics
Plastic keys
Key functions
Negative Sign
Power Off
Memory
Variables: 9
Variables List
Independent Memory (M / M+ / M-)
Answer Memory
Memory Protection
Reset Function
Power supply
Solar & Battery
Approximate battery life Main 2 years
Auto Power Off
Accessories
Hard Case

Display Settings

Display format settings
Number Format: Fix
Number Format: Sci
Number Format: Norm
Engineering Symbol
Engineering Notation
Toggling Calculation Results
Fraction / Decimal Conversion (SHIFT＋＝)

Calculation Functions

Basic calculation
Basic Calculation
Bracket Calculation
Fraction Calculation
Degree, Minute, Secound (Sexagesimal) Calculations
Reciprocal Calculation
Percent Calculation (scientific calculator function)
Ratio calculation
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
UNDO
CALC Function
SOLVE Function

Functions Features

Basic functions
Basic Mathematical Functions
Number of Functions : 552
Independent Key x
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
Prime Factorization
Random Number Generation
Random Integer Generation
Summation
Other functions
Spreadsheet
Equation
Inequality Calculations
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
Intermediate Statistics
Advanced Statistics
Distribution Calculations

Exam Compatibility