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Catalogue
Casio FX 991 CE X - Calculator

Reviews Casio FX 991 CE X

Interested in reviews of Casio FX 991 CE X? It got 4.9 out of 5 stars from our customers. Find specific customer reviews of Casio FX 991 CE X below. We will appreciate if you also share your experiences with Casio FX 991 CE X after purchasing.
11,390 Ft
In stock > 5 pcs
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User Reviews

Barbora, Praha 10 Vršoviceflag
Rated 24/03/2026, variant Casio FX 991 CE X
Verified purchase
Supplied with a dead battery.
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Companyflag
Rated 24/03/2026, variant Casio FX 991 CE X
Verified purchase
Has Casio ever done anything wrong? Not for me.
CASIO
Solar
The cloud of features
Czech
display could have faster fps (noticeable ghosting during rendering)
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Lukáš, Brno 24flag
Rated 06/03/2026, variant Casio FX 991 CE X
Verified purchase - review from a price comparison website
Lots of features
Table of atomic masses
Cannot square root complex numbers
Limited number of rows in the function value table
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Reply from Alza
Reply from Alza
02/04/2026
Hello, thank you for your suggestion, on the basis of which the supplier contacted us and would like to respond below. "The calculator does not support calculating the square root of complex numbers. The instrument can only perform basic arithmetic operations and integer powers. Calculations with complex numbers are not included because they are not part of the school curriculum for which this calculator was designed. Regarding the function value table: the table is limited to max. for 30 lines. Therefore, it is necessary to select the start value, end value and step to match this constraint. If the selected parameters lead to more than 30 rows, the calculator will display an error message. This limitation is mainly due to the limited memory capacity in order to maintain the reliability and simplicity of the instrument. Alternatively, if you need these additional features, we can recommend the FX-CG50, which offers enhanced mathematical capabilities. " Please do not hesitate to contact us in case of need. Thank you and have a nice day, Ondřej - Alza expert
Vladimír, Dřevčice (okres Praha-východ)flag
Rated 15/01/2026, variant Casio FX 991 CE X
Verified purchase
The substrate under the keys has an optically grey-black grid that makes it impossible to read the yellow, purple and blue labels under the keys when using the SHIFT function. Money wasted on a calculator with overloaded features. Unfortunately, the design of the backing behind the buttons makes it very uncomfortable for the user, especially after a long period of study when the eyes are already tired. I'm going back to my older SHARP science machine.
Completely illegible labels above the buttons when using the SHIFT function.
The background under the keys has an optically grey-black grid, which makes it impossible to read the yellow, purple and blue labels under the keys
A quick tutorial on how to set up the calculator "wrapper/holder" calculator would be handy, similar to what the lower versions of this series have.
White plastic packaging,. which gets "dirty" and the calculator is not easily visible among the papers and notebooks.
Unsuitable for people with close-fitting glasses and for working in artificial light
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Petr, Vrchlabí 1flag
Rated 03/12/2025, variant Casio FX 991 CE X
Verified purchase - review from a price comparison website
Czech menu, QR code generation on the display. A unique feature is the spreadsheet. Memory capacity up to 160 statistical data items. Slip-on hard cover for the dispeje. The internal operating number of digits is 16. Casio FX 991 CE X has 668 functions, so it can cope with calculations in high school and college as well as in work practice. The Casio FX 991 CE X is a good choice from my point of view, both in terms of a large number of functions, a new LCD display with high resolution, processing and a reasonable price.
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Vojtěch, Olomoucflag
Rated 10/11/2025, variant Casio FX 991 CE X
Verified purchase
Large number of functions
Clear manual describing how to use all the functions of the calculator
Ideal for high school math
Price
Cannot be used for state mathematics exams (can solve equations)
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Daniel, Trutnovflag
Rated 10/09/2025, variant Casio FX 991 CE X
Verified purchase
overall great
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Kryštof, Rožnov pod Radhoštěmflag
Rated 12/07/2025, variant Casio FX 991 CE X
Verified purchase
I went through all of high school with her, so good.
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Customer, Prahaflag
Rated 07/07/2025, variant Casio FX 991 CE X
Verified purchase - review from a price comparison website
It's not
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Radek, Jihlava 1flag
Rated 26/05/2025, variant Casio FX 991 CE X
Verified purchase - review from a price comparison website
Smart.
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