Casio FX991ES Plus Dual Powered Scientific Calculator107/8237


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The Casio FX-991ES Plus is Casio's most advanced scientific calculator with 417 mathematical functions. Recommended for Advanced GCSE, A/AS Levels and Highers. Dual powered (solar with battery back-up).

This advanced model allows Matrix, Equation, Integration and Differential calculations as well as Random Integers, Scientific Constants and Metric Conversions. The large natural texbook display (Natural V. P. A. M. ) shows mathematical expressions as they appear in your textbooks.

  • Suitable for GCSE, A Level and above.
  • LCD display.
  • 9 data memory.
  • Non-stick keys.
  • 10+2+15 -digit display.
  • Auto shut-off.
  • 417 functions.
  • Verify function.
  • Algebraic logic.
  • Regression analysis.
  • Statistical functions.
  • Hyperbolic.
  • 24 levels of parenthesis.
  • Metric conversions.
  • Dual power source - solar.

General information:

  • Batteries required 1 x button cell (included).
  • Manufacturer's 3 year guarantee.
  • EAN: 4971850182276.

45 reviews

Overall rating (4.8)

Display screen
Ease of use
BazaarVoice TrustMark
5 / 5

Complex Function Features are Great

Excellent calculator with easy to use functions and excellent screen.

5 / 5

All you will ever need - and more!

You only need the extra features of this calculator if you're going to do really advanced stuff - A level and beyond. For most students one costing half as much will do all that is needed. A little more positive key press would have been nice. I've always though Casio was the best to use.

5 / 5

Very helpful! Should have bought one before!

I recently sat my GCSE maths exam, and I used another scientific calculator. I subsequently bought the Casio FX991ES and I should have bought one earlier. It is user friendly, fun to use and helps you understand calculations. This calculator is not necessarily an easy option for answering maths questions. The calculator helps you to apply what you know. Excellent for calculating fractions, and gives you the option of an answer in fraction or decimal form. Very useful indeed.

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Questions & answers

5 questions | 6 answersAsk a question
Can you confirm that this calculator does "Recurring decimals, prime factorisation and has verify function",

For this calculator to have these abilities, it would have to be the "FX991ES Plus C" not "FX991ES Plus. If it does have these abilities, then you are displaying the wrong image for this calculator because :- the "VERIFY" function should be above digit "6" : - the "recurring digits" function should be in red above the square root key : - and prime factorisation key "FACT" should be written above the "degrees minutes seconds "key.

1 Answer

I have looked into this for you and this calculator does not do recurring decimals
Thank you for using Argos Q&A

Is the information given in the "Technology Product description / spec" for this calculator false?

Since you have confirmed that this calculator cannot do recurring decimals, why are you continuing to advertise this calculator as being able to do "recurring decimals, Prime Factorisation and Verify"

1 Answer

I have confirmed with our supplier that this calculator does not do recurring decimals,
we are currently in the process of getting this information changed
Thank you for suing Argos Q&A


Is it possible to change the language on the calculator to the french one

1 Answer

Hi there,

I have looked into this and can confirm that the language on this device can not be changed.

Thanks for using Argos Q&A.

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Boring but important info

*Prices correct as displayed but are subject to change.

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