# FX-991ES Plus

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## At a glance

The Natural Display (Natural-V.P.A.M.) shows mathematical expressions like roots and fractions as they appear in your textbook, and this increases comprehension because results are easier to understand.

• 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

## Technical Specifications

Display
• Display type: 31 * 96 FULL DOT
• Natural display
• Algebraic input logic: Natural V.P.A.M.
• Number of characters/lines: 15/1+10/1
• Significand function: 10+2

Memory
• Repeat function
• Variable memory: 9
• Number of storable programs: Calc / Solv button

Basic mathematics
• Functions: 580
• Scientific constants: 40/
• Unit conversions: 164
• Bracket levels: 24
• Fraction calculations: 2 Modi
• Coordinate conversion Pol
• Trigonometric functions sin/cos/tan/sin-1/cos-1/tan-1
• Hyperbolic functions sinh/cosh/tanh/sinh-1/cosh-1/tanh-1
• Exponent, log, In, 10x, ex
• Mathematical functions ?, x2, x-1, 1/x, x!, ?, xY, ?, x1/y
• Calculations based on n (hexadecimal/decimal/binary/octal)
• Logical operators (AND/OR/etc.)
• Calculations in the sexagesimal system
• Percentage calculations
• Remainder function
• Technical notation ENG/ENG
• Calculation of complex numbers
• Random number generator
• Random integers
• Calculation of the minimum or maximum of a quadratic function
• GCD/LCM function
• Base-N calculations
• "Verify" test function
• Value table
• Recurring decimal fractions

Statistics
• Summation of ?x, ?x2
• Summation of ?x, ?y, ?x2, ?y2, ?xy
• Standard deviations for grouped and ungrouped values
• Distribution functions (normal distribution and inverse normal distribution, binominal distribution, Poisson distribution)
• Regression analysis
• Permutations (nPr) and combinatorics (nCr)
• Matrix calculation/vector calculation
• REF/RREF function
• Equation calculation
• Inequality calculation

Differential and integral calculus
• Numerical integral calculus
• Numerical differential calculus

Other
• Menu language: german
• Automatic shut-off
• Identical emulator software: optional
• Energy supply: Solar+Battery
• Battery type: 1 x LR-44
• Size (H x W x D mm): 11,1 x 80 x 162
• Weight: 95 g

• Availability of models and/or lineups may differ depending on the country or region.
Technical amendments and errors excepted. The sizes in figures do not correspond to the original sizes.
The colours may differ slightly from the original.

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