Casio FX-991ES

The FX-991ES is a partially solar-powered calculator from Casio, whose special feature is the natural representation of mathematical expressions and formulas by a 31 x 96 dot matrix. It appeared in 2005 as a successor to the FX-991MS (which offers a slightly lower range of functions, and only a single-line matrix display).
Features overview
*403 functions Display: "Natural Textbook Display"
*LCD (Dot-Matrix), 31 x 96 dots, 10 + 2 digits
*Energy supply: two way power
*Comes with new slide-on hardcase
*dimensions (H x B x D): 161,0 x 80,0 x 12,2 mm
*weight: 104 g
Functions & general information

Detailed specifications

*Multi Reply
*24 Parentheses level
*Variable memory (7)
*STO/RCL-key
Basic scientific functions

*Trigonometric and inverse trigonometric functions
*Hyperbolic and inverse hyperbolic functions
*x2/ xy / x√ - (Power / Power Root) calculations
*logarithmic calculations (log, ln)
*10x, ex - (exponential) calculations
*√ - (root) calculations
*x^-1 - (inverse) calculations
*Combinatoric and Permutation
*Random Number Run#
*Conversion of polar coordinates into rectangular coordinates and inverse
*Fraction (two modes)
*Conversion of hexadesimal into decimal and inverse
*Calculates in Degree, Grad and Radian
*Π-key, e-key and %-key
*SCI/FIX/ENG function
*Statistics:
*List based statistics
*1-variable statistics
*Standard deviation
*2-variable statistics (Regressions)
*Linear
*Exponential
*abExponential
*Logarithmic
*Power
*Inverse
*Quadratic

*Solve/Calc
*Numeric integration/differentiation (numeric: definite only)
*∑() - function
*complex number calculation
*a+bi/ rÐq
*Base-n calculation
*Logical calculation
*Equation
*Simultaneous equation
*Polynomial equation
*Matrix
*Determinant
*Inverse matrix
*Transposed matrix
*Vector
*Inner product
*Outer product
*Physical constant
*Metric conversion
*Natural Input
*Fraction
*Root
*Power
*Parentheses
*Absolute number
*Sum

*Non-natural input (such as the MS models)
*Output with √ form
*Output with π form
*Function table

Main Menu

See Also

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