Casio FX-991DE CW ClassWiz Technical Scientific Calculator with Protective Case, German Menu Guide (Limited Edition)

Price: €31.27 - €28.94
(as of Dec 04, 2025 22:22:06 UTC – Details)

From the manufacturer

The latest generation of ClassWiz calculators

The new ClassWiz Series includes the world’s first high-resolution grayscale display with four brightness levels, enabling even clearer representation of mathematical expressions compared to conventional models. The new display also makes it easier to see the current input point. The customized button design promotes more intuitive operation and manageability.

Casio FX-991DE CW

Technical Scientific Calculator

The FX-991DE CW model is the most powerful model of technical-scientific calculators. In addition to a simple spreadsheet, distribution functions and the new math box, the calculator solves equations and inequalities. In addition, integrals, differentials and matrices can be calculated.

German menu navigation Natural display 680+ functions Solving Equations QR code function for results visualisation on your smartphone or tablet

Operation

The innovative operation and menu-assisted navigation simplifies the use of the calculator for students. Abbreviations and shortcuts are largely omitted.

Natural representation

Mathematical expressions such as roots, fractions, and logarithms are presented in natural spelling.

math box

With the math box, you can simulate dice and coin toss attempts. The relative frequencies of totals can be listed.

Value Table

New editing options improve working with value tables. This means that additional values can be added and added manually or additional values can be automatically generated at the touch of a button.

Functions:

equations

Polynomial equations up to 4. Degrees and additional equation systems with 4 unknowns can be solved with exact values and without approximation. Solving an equation using the Newton method is also implemented.

vectors

Vectors up to 3rd Dimensions can be calculated. The usual commands such as scalar product, cross product, angle or unit vector are available.

Integrals & Differentials

Differentials and integrals can be easily entered and calculated numerically via stencils. Even in the value table, differentials and integrals are available.

matrices

Up to dimension 4×4, operations such as determinant, transpose and unit matrix can be performed. The conversion to the reduced line step form (RREF) is also available.

QR code function

Display content

The newly available QR code function allows you to visualise results of the technical-scientific calculator with your smartphone or tablet.

Scan QR Code

The newly available QR code function allows you to visualise results of the technical-scientific calculator with your smartphone or tablet.

Content visualization

With the help of ClassPad.net, graphs, diagrams, accessibility and tables for the captured data can be displayed and optimally displayed.

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Customer Reviews

4.6 out of 5 stars 328

4.6 out of 5 stars 185

4.6 out of 5 stars 139

4.7 out of 5 stars 28,475

Price

€20.99€20.99 €25.99€25.99 €23.94€23.94 €28.94€28.94

German menu navigation

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9 variable memories

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prime factor decomposition

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Physical Constants
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47 EU 47 EU

Unit Conversions
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164 cm 164 cm

Integral calculation
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Solving Equations
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Matrix/Vector Operations
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Distribution Functions
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spreadsheet
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Batteries ‏ : ‎ 1 LR44 batteries required. (included)
Product Dimensions ‏ : ‎ 16.2 x 7.7 x 10.7 cm; 320 g
Date First Available ‏ : ‎ 13 July 2023
Manufacturer ‏ : ‎ Casio Europe GmbH
ASIN ‏ : ‎ B0CBSC8BGQ
Item model number ‏ : ‎ FX-991DECW-CASE-BKWE
Country of origin ‏ : ‎ Thailand
Guaranteed software updates until ‏ : ‎ unknown
Best Sellers Rank: 17 in Stationery & Office Supplies (See Top 100 in Stationery & Office Supplies) 1 in Scientific Calculators
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Casio FX-991DE CW with protective case
The FX-991DE CW calculator is the most powerful model of technical-scientific calculators with 696 functions
The innovative operation and menu-assisted navigation simplifies the use of the calculator for students. Abbreviations and key combinations are largely omitted
Mathematical expressions such as roots, fractions, and logarithms are presented in natural spelling
With the math box, you can simulate dice and coin toss attempts. Relative frequencies of totals can be listed