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  • Casio FX-991ESPLUS Scientific Calculator
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Casio FX-991ESPLUS Scientific Calculator

512 customer reviews
| 28 answered questions

RRP: £19.99
Price: £14.45 & FREE Delivery in the UK on orders over £20. Details
You Save: £5.54 (28%)
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58 new from £11.74 2 used from £11.87
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  • The Casio FX991ESPLUS is Casio’s most advanced scientific calculator with 417 mathematical functions
  • Recommended for Advanced GCSE, A/AS level and Highers
  • This ever popular model is now available with Random Integers and an improved equation mode
  • Solar Powered with Battery backup
  • The large Natural Textbook Display (Natural-V.P.A.M.) shows mathematical expressions like roots and fractions as they appear in your textbooks which increases comprehension because results are easier to understand
  • 3 year guarantee
  • NB. This Model can not be used in some Exams in Eire. Please check first. User manual (PDF )can be found below.

There is a newer model of this item:

£14.45 & FREE Delivery in the UK on orders over £20. Details In stock. Sold by avs products and Fulfilled by Amazon. Gift-wrap available.

Frequently Bought Together

Casio FX-991ESPLUS Scientific Calculator + Helix National Curriculum Achiever Maths Set A06010 (Single unit)
Price For Both: £20.81

Buy the selected items together

Product Information

Package Quantity: 1 | Style Name: 1
Technical Details
Brand Fingerprint Designs
Model NumberFX-991ESPLUS-SA-UH
ColourSilver
Item Weight95 g
Product Dimensions18.5 x 8.7 x 3.5 cm
Materialplastic
  
Additional Information
ASINB0034BAQS8
Best Sellers Rank 268 in Office Products (See top 100)
Shipping Weight181 g
Date First Available17 May 2007
  
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Product Safety

This product is subject to specific safety warnings
  • Warning: Not suitable for children under 36 months

Product Description

Package Quantity: 1 | Style Name: 1

Product Description

The new CASIO Standard Scientific Calculators with Natural textbook display format. CASIO's original Natural Expression Input Display and Natural Expression Output Display make it possible to display fractions, exponents, logarithms, powers, and square roots just as they are written in the textbook. The result is enhanced student comprehension and improved math class efficiency.The FX-991ES PLUS has a matrix display and solving equations has never been easier with new functions. Another is random Integers where you specify the range of random integers you want to generate and the FX991ESPLUS will display them. The number of memories has also been increase from 7 to 9. The FX991ESPLUS has many functions that can be used to solve many problems. Our users say they love the fact that the FX991ESPLUS use two types of power, one solar and the other battery so is Economy friendly and you are safe to take it into an exam without it failing not to work. One of the advantages that we are told about is that the result that you get you able to use in the next part of the sum without having to round up numbers or to re-type which can lead to errors.You are able to use the calucator to work backwards, such as in algebraic equations. This can make life so much easier.The high technical specifications make this the most powereful Scientific at this price point.You can use this calculator from School to University and on into work

Other Casio models to consider

If you require an even more powerful and more advanced calculator, the Casio Graphic calculator range provides dynamic graphing, capable of calculating and displaying graphs, charts, spreadsheets and statistics. The Casio Graphic range includes the FX-9750GII, FX-9860GII and FX-CG20

Why a Casio Calculator

Casio is the UK’s No.1 calculator brand.Pioneering developments for over 50 years, since first inventing the electronic calculator in 1957, Casio are leaders in the development of calculator technologies and mathematical tools.Suitable for daily use, whether you are studying for mathematical qualifications, working on complex financial analysis, wanting time saving desktop assistance or looking for handy calculations whilst on the move.The Casio range of Graphical, Scientific, Desk and Pocket Calculators are powerful and rugged mathematical tools, built specifically for your task at hand.

Why a Casio Scientific/Graphic calculator

Casio have pioneered the development of mathematical tools for over 50 years and have always provided devices embedded with ease of use, advanced features and progressive learning functionality.The Casio range of Scientific and Graphic calculators enhance mathematics study along with a broad range of associated subjects and assessments.The Casio educational calculator range provides a series of features and devices which will continue to develop student understanding, interpretation and fundamental knowledge of the subject area

Technical Details

  • Natural Textbook Display
  • Two Way Power
  • 417 functions
  • Parentheses 24
  • Multi-replay
  • Reset
  • Degrees
  • Trigonometric (SIN/COS/TAN)
  • Radians
  • Gradians
  • Integration Differential
  • Equation calculation
  • Logarithm
  • Exponents
  • Reciprocals
  • Degrees,minutes,seconds
  • Exponential regression
  • Negative Indicator
  • Hyperbolics
  • Expression editing
  • Backspace,delete
  • Matrix calculations
  • Auto power off
  • Normal Distribution
  • Random numbers
  • Logarithmic regression
  • Power regression
  • Quadratic regression
  • Inverse regression
  • Linear regression
  • Coordinate conversion
  • Factorials
  • Roots and powers
  • Matrices
  • Equation Solver
  • Formula Solver
  • Numeric Differentiation
  • Numeric integration
  • Square root
  • DEC,HEX,BIN,OCT conversions
  • FIX,SCI,NORM
  • Vector calculations
  • Complex number calculation
  • CALC function
  • SOLVE function
  • Base-n calculations
  • Random Integers
  • Fraction calculation
  • Combination and Permutation
  • Logarithm log
  • List-based STAT data editor
  • Standard deviation
  • Paired-variable statistics regression analysis
  • Logical operations
  • Table function
  • 40 scientific constants
  • Metric Imperial Conversions
  • 40 metric conversions (20 conversion pairs)
  • 9 variable memories
  • Comes with slide on hard case
  • Manufacturer's Description

    New CASIO Standard Scientific Calculators with Natural textbook display format!! CASIO's original "Natural Expression Input Display" and "Natural Expression Output Display" make it possible to display fractions, exponents, logarithms, powers, and square roots just as they are written in the textbook. The result is enhanced student comprehension and improved math class efficiency.The FX- 991ES PLUS has a matrix display and solving equations has never been easier as this is one of the new functions. Another is random Integers where you specify the range of random integers you want to generate and the FX991ESPLUS will display them. The number of memories has also been increase from 7 to 9. The FX991ESPLUS has many functions that can be use to solve many problems. Our users say they love the fact that the scientific calculator use two types of power, one solar and the other battery so is ECO friendly and you are safe to take it into an exam without it failing not to work. Others opinions of the product is that they think that it is one to the best calculator that you can buy. One of the advantages that we are told about is that the result that you get you able to use the same figure in the next part of the sum, without having to round up numbers or to re-type up the whole digits which can lead to errors. Other great functions that we are told about was that you are able to use the calucator to work back wards, such as in algebraic equations. This can make life so much easier or so our users tell us. The high technical specifications make this the most powereful Scientific at this price point.You can use this calculator from School to University and on into work.

    Other Casio models to consider

    If you require an even more powerful and more advanced calculator, the Casio Graphic calculator range provides dynamic graphing, capable of calculating and displaying graphs, charts, spreadsheets and statistics. The Casio Graphic range includes the FX-9750GII, FX-9860GII and FX-CG20

    Why a Casio Calculator?

    Casio is the UK’s No.1 calculator brand. Pioneering developments for over 50 years, since first inventing the electronic calculator in 1957, Casio are leaders in the development of calculator technologies and mathematical tools. Suitable for daily use, whether you are studying for mathematical qualifications, working on complex financial analysis, wanting time saving desktop assistance or looking for handy calculations whilst on the move. The Casio range of Graphical, Scientific, Desk and Pocket Calculators are powerful and rugged mathematical tools, built specifically for your task at hand.

    Why a Casio Scientific/Graphic calculator?

    Casio have pioneered the development of mathematical tools for over 50 years and have always provided devices embedded with ease of use, advanced features and progressive learning functionality. The Casio range of Scientific and Graphic calculators enhance mathematics study along with a broad range of associated subjects and assessments. The Casio educational calculator range provides a series of features and devices which will continue to develop student understanding, interpretation and fundamental knowledge of the subject area.

    Technical Details

  • Natural Textbook Display
  • Two Way Power
  • 417 functions
  • Parentheses 24
  • Multi-replay
  • Reset
  • Degrees
  • Trigonometric (SIN/COS/TAN)
  • Radians
  • Gradians
  • Integration Differential
  • Equation calculation
  • Logarithm
  • Exponents
  • Reciprocals
  • Degrees/minutes/seconds
  • Exponential regression
  • Negative Indicator
  • Hyperbolics
  • Expression editing
  • Backspace/delete
  • Matrix calculations
  • Auto power off
  • Normal Distribution
  • Random numbers
  • Logarithmic regression
  • Power regression
  • Quadratic regression
  • Inverse regression
  • Linear regression
  • Coordinate conversion
  • Factorials
  • Roots and powers
  • Matrices
  • Equation Solver
  • Formula Solver
  • Numeric Differentiation
  • Numeric integration
  • Square root
  • DEC/HEX/BIN/OCT conversions
  • FIX/SCI/NORM
  • Vector calculations
  • Complex number calculation
  • CALC function
  • SOLVE function
  • Base-n calculations
  • Random Integers
  • Fraction calculation
  • Combination and Permutation
  • Logarithm log
  • List-based STAT data editor
  • Standard deviation
  • Paired-variable statistics regression analysis
  • Logical operations
  • Table function
  • 40 scientific constants
  • Metric / Imperial Conversions
  • 40 metric conversions (20 conversion pairs)
  • 9 variable memories
  • Comes with slide on hard case

  • What Other Items Do Customers Buy After Viewing This Item?


    Customer Questions & Answers

    Customer Reviews

    4.7 out of 5 stars

    Most Helpful Customer Reviews

    153 of 156 people found the following review helpful By Master J on 9 Sept. 2010
    Style Name: 1Item Package Quantity: 1
    I bought the older version of this calculator 5 months before my GCSE maths exams. Even at this level I felt at a massive advantage: you can type in equations like 3y+1=5 and it will solve them. It also has a special mode which solves quadratic, cubic and simultaneous equations. Another time saver is when you want to repeat the same operation multiple times rather that scrolling along them replacing the number, for example if you wanted a list of what the value of a number cubed minus its value squared rather than entering 2^3 - 2^2 then 3^3 - 3^2, 4^3 - 4^2 ect. You could just:
    1. Enter X^3 - X^2
    2. Press CALC
    3. Enter the value you want X to be and press =
    4. Repeat steps 2 and 3 for whatever values you want
    With a medium sized function which you need to input say ten values you could more than quarter the time.

    I have just finished AS level maths and the new functions that are useful are non-symbolic integration and differentiation this means you cannot derive X^2 to 2X (calculators which do this are banned in UK exams) but you derive the function X^2 when X is 3, to equal 6. It also solves logs to the base of any real number as well as calculating the sums of sequences using the sigma notation.
    The applied module it took was statistics and for this you can just enter the data you have been given and it is able to calculate the values for linear regression lines the PMCC, Sxx Syy Sxy, min max, mean, range etc. It can do other types of regression but I have no use for these yet, in fact I have not use for most of the features of this calculator and it's still incredibly useful, it can do so much means it's probably the calculator of choice from GCSE to PhD. Even though I have a graphic calculator I use this 99% of the time for shear ease of use.
    Read more ›
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    8 of 8 people found the following review helpful By Laci on 27 May 2014
    Style Name: 1Item Package Quantity: 1 Verified Purchase
    Although I think this calculator is not perfect, I gave five stars because nothing comes close as far as I know.

    The good: The natural display make it much easier to use than other calculators and has a range of very useful functions. Some of which like (CALC) and sum function will save time in the exam, some others like numerical integration, differentiation lets you double check your calculations so that you can be absolutely certain that they are correct, and notice any errors. There's a useful guide how to make the most out of it: http://www.thestudentroom.co.uk/wiki/Making_the_Most_of_your_Casio_fx-991ES_Calculator

    The bad: I found it a bit disappointing that there's no product function, even though the manual says so. Once you use one of the non-standard modes it starts to get a bit complicated and time-consuming to deal with the menus. You can only use the natural display in the standard mode. (you have to use conventional linear display in the others). A good example of complicated menus is the vector mode (part of A-level maths):

    Every vector operation requires you to press 3 buttons: (shift) + (5) (gives the list of options to choose from) and a number next to the option you need. For example for the dot product you can't just press the decimal dot button, you have to go through the same menu. You can choose the vector variables the same unintuitive way. When choosing the dimensions of the vector you need to press (1) for 3 dimension, and (2) for 2. Again this is unintuitive. Because of this simple vector-calculations are faster if you do them in the normal mode.
    Read more ›
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    4 of 4 people found the following review helpful By C. Quinn on 25 Jun. 2011
    Style Name: 1Item Package Quantity: 1
    I bought this calculator just before my final A-Level maths exams took place after it was highly recommended to me by a friend. I used it both in C2 and in C4 (the only two I was doing this time) and I have to say that it is absolutely amazing. I really wish I had this calculator from GCSE onwards. It is able to easily solve quadratic, cubic and simultaneous equations, you just type them in (look how to do this on YouTube, it's quite simple) and it will generate the answer for you. I have never been quick at solving quadratics or cubics so during C2 and C4 the ability to solve them using this calculator was priceless.

    The other thing I really liked about this calculator is that it does integration with limits, for C4 you will need to integrate at least one an equation with limits (integration is a big topic on C4) and show your working out, which can sometimes be a 6 or 7 mark question, this calculator won't show you the working but it will give you the exact answer so that when you are done with the question you can use the calculator to check if you are right or not, which could possibly save you quite a few marks (it really helped me).

    To sum it up this calculator is well worth the money, even if you are just thinking of buying right before your exams as it most likely will gain you marks. Also this calculator is NOT on the banned calculator list by Edexcel (not sure about other exam boards though).
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    27 of 29 people found the following review helpful By David McCausland on 23 Oct. 2011
    Style Name: 1Item Package Quantity: 1
    This is a great calculator.

    Loaded with functions, including arithmatic Integration and Differentiation (No algebraic though), solving equations, (Ie it can work out which values of x satisfy 3x^2 + 9x + 2 = 0)

    The display is also very good for laying out calculations and it has 40 scientific constants loaded into it's memory which are all noted on the back cover.

    HOWEVER.

    I used this calculator for my A-Levels, took it to Uni then discovered that it's banned for all the examinations at my University! Make sure you check any calculator policies before you purchase.

    Main things to look out for are:

    Integration
    Differentiation
    Matrices
    Abiliy to solve equations

    If the policy notes any of these, you probably won't be able to use it. Check out the Casio FX-85GT if needs be.

    Otherwise a very handy calculator. (Also it's shiny)
    Comment Was this review helpful to you? Yes No Sending feedback...
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