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Casio Scientific Calculator fx991ES Plus

RRP: R367.95
R294.95 (You save R73.00)

 Product Description

Natural Textbook Display. 417 FUNCTIONS. Two-way power
The Casio FX991ES PLUS is Casio's most advanced scientific calculator with 417 mathematical functions. This ever popular model is now available with Random Integers and an improved equation mode. The large Natural Textbook Display (Natural-V.P.A.M.) shows mathematical expressions like roots and fractions as they appear in your textbooks which increases comprehension because results are easier to understand.
Two-way power (Solar + Battery)
Solar powered when light is sufficient, battery powered when light is insufficient.
Plastic keys
Designed and engineered for easy operation.
Natural V.P.A.M. display
Display expression same as textbook.
List based STAT-data editor
Viewing and editing of input data in list format, showing data groups (x-data, y-data, frequency) and surrounding data.
Quick and easy recall of previously executed formulas for editing and re-execution.
10 + 2 digits
10-digit mantissa + 2-digit exponential display.
Dot matrix display
High-resolution screen provides beautiful looking graphs every time.
  • Natural-V.P.A.M.
  • Dot matrix display
  • 15 and 10+2 digits
  • 417 functions
  • Equation solver
  • 20 pairs of values for metric conversion
  • Calculation with complex numbers
  • Calc key (temporary formula memory)
  • 40 physical constants
  • Matrix/vector calculation
  • Numerical integral & differential calculus
  • Random Integers
  • New equation Mode
  • Function table
  • Two-Way-Power
  • Functions & general information

General information:

  • 417 functions
  • Display: Natural Textbook Display, Natural V.P.A.M.
  • Power supply: solar powered with an auxiliary battery with a hard case


  • NEW: New fraction input mode
  • NEW: Improved equation mode
  • NEW: Random integers
  • Repeat function
  • 24 levels of brackets
  • Variable memories (6)
  • STO/RCL keys

Scientific functions:

  • Trigonometric and inverse trigonometric functions
  • Hyperbolic and inverse hyperbolic functions
  • Exponential functions 10x, ex
  • Inverse function x-1
  • Power and root functions x√, √, x2, xy
  • Logarithm functions (log, ln)
  • Combinatoric and permutations
  • Random number generator
  • Converts between polar coordinates and rectangular coordinates
  • Calculates with fractions (two modes)
  • Converts between sexagesimal and decimal
  • Calculates in gradian, degree and radian measure
  • π key, e key and % key


  • Lists of based statistics
  • Statistics with a variable
  • standard deviation
  • Statistics with two variables
  • Linear
  • Exponential
  • abExponential
  • Logarithmic
  • Power
  • Inverse
  • Quadratic
  • Solve/Calc
  • Numeric integration
  • Numeric differentiation
  • ∑()-function
  • calculates with complex numbers
  • a+bi /r∠θ
  • Calculations on the basis of n
  • Logical calculations


  • Linear systems of equations
  • Polynomial equations
  • Linear systems of equations
  • Polynomial equations


  • Determinants
  • Inverse matrix


  • internal product
  • external product
  • physical constants
  • metric conversion

Normal entry

  • Fractions
  • Roots
  • Powers
  • Parentheses
  • Amounts
  • Numeric differentiation/integration
  • Totals
  • Non-natural input (such as the MS models)
  • Output in √-form
  • Output in π-form
  • Functions table

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