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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. Even when preparing for the non-calculator exams like some GCSE papers and core 1 (C1) at A-level this is useful as you can check your answers quickly or if needed do your homework very quickly on the bus to school. I would like to say this calculator is no substitute for hard work and proper understanding of the concepts. While it is true you only will really be able to use this calculator with ease and unlock its potential if you could do a question without the calculator if required and I would only recommend using it as a time saver, especially if you want to do a maths related degree. That said it can still get you marks where you shouldn't deserve them. At GCSE level they gave marks if the correct answer was seen even if no working was shown. So for one 5 mark question I did just that and I think got it right. Then at A-level I was stuck on one part which upon using the cubic equation solver showed me the correct method. These small marks could be the difference between whether a university accepts or rejects you, which for only [...] is a bargain. Just to finish a note of the differences between normal and the PLUS version. I terms of build quality there is very little difference. The new one is slightly more stylish. Functionally the PLUS version will show the answer to quadratic, cubic and simultaneous equations in surd form which the older model doesn't, this can earn you marks on some exams that require a surd for answer for the next question. This calculator is top of its range but lower models have features which this one doesn't: The two main cheaper models amazon currently sell (as of 08/2011) are the Casio FX-83GTPLUS Scientific Calculator and the solar powered Casio FX-85GTPLUS Scientific Calculator (also in pink) they are able to do prime factorisation, recurring decimal and verify inequalities. I am not sure why the 991 does not have these functions but perhaps it is so more useful features aren't compromised for calculations which can be done easily enough already. If you are buying a calculator for secondary school for the first time buy this, but don't exploit it. If you already have a basic scientific calculator already then keep it but buy this one or a newer version before your first important exams. 2011 UPDATE: Having completed my A-levels I found that for Core 4 the vector mode was useful. If you do further maths then this calculator is extremely useful as it can do complex number calculations including squaring and cubing in a way that I find much faster to enter than on a graphical calculator (but it cannot do square or cube rooting). It is also able to convert between algebraic and polar form, in other words find the modulus and argument of a complex number. Finally it has most (A-level) Matrix functions such as inverting which are useful to check your answers with.

Prior to this calculator, I used a Casio FX 991 ES (an old model). After losing it, I decided to upgrade to the ES-Plus. I was pleased to have upgraded -- the ES-Plus is a fully featured calculator yet the features are not too intrusive to hinder every day, 'casual' operations (such as simple addition). When wanting to do something a little more complex (e.g. complex numbers, vector products, matrices etc.), a simple shift into a different mode and the calculator becomes even more powerful. A particular feature which is useful for the GCSE mathematician is the equation solving function (which can be used to check an answer after working it out by hand) -- this can be used to solve linear, quadratic and cubic equations. For AS and A2 mathematicians, the statistic functions (such as regression) are useful -- regression calculations can take a lot of working, so it's satisfying to be able to check that you're right using a calculator function! Complex/Imaginary modes and vector modes are particularly helpful in Further Pure modules. Another feature which I found useful is the 'table' function -- this allows you to calculate a series of values for a certain function in a certain range. I have used this many times in Further Pure 2 when having to draw polar graphs! Arguably, the build quality isn't superb, but you have to remember that this is one of the cheapest calculators you can buy: and for how powerful it is, it is certainly worth it.

Perfect

Casio has always been my favourite calculator company (I haven't had the pleasure to play with a Texas Instruments). I purchased this calculator almost a year ago for my first A-Level calculator exam (Core 2)to replace my fx-83es that I used at GCSE, and have never looked back. It has all the functions of the fx-83es (natural display, scientific functions, radians etc) and so much more. the main differences between the fx-83es and the fx-991esplus are as follows: Integration and differentiation is a main selling point for me. Calculus functions are only numerical, so are only useful for checking you have the right answer (you still have to put in the hard work to learn how to integrate and differentiate). calculus functions do not work on parametric equations, though. The CALC function allows you to enter any equation (eg f(x)=4x³ - 6x² + 7x -4) and substitute values of x. Essential for trial & improvement, remainder theory, etc. The equation function allows you to enter simultaneous (with either 2 or 3 unknowns), linear, quadratic, and cubic equations to find all your values of X, Y and Z (Y and Z on simultaneous equations only). The SOLVE function is only useful on linear equations, as it only provides 1 value of x. Although, its trial and improvement algorithm will allow you to use trig functions. The calculator is pre-programmed with 40 scientific constant, with a legend on the inside of the case. As a physics and chemistry student, this has saved me from having to flick through the formula book during exams, saving valuable minutes. Having constants pre-programmed into the calculator also means I can't make a mistake in using the wrong constant, or copying it down incorrectly. The calculator does have a complex number mode, although as a normal maths (not further maths) student, I have never needed to learn how to use it. However, the reason I gave the fx-991esplus 4 stars and not 5 is that the build quality does leave some to be desired. Although it has withstood the abuse that comes from being by a student's side for a year, the plastic feels a bit flimsy, and at first glance, it looks like something from the 1970s - otherwise it would be a perfect non-graphic scientific calculator. The bottom line - This is an essential calculator for any student studying maths or science (or both) at A-Level. It won't do your maths paper for you, but it will allow you to make sure you have the right answer, so you can go back and trace your mistakes. Make sure, however, that you pop the calculator case back on before you throw it into your back at the end of lessons - otherwise, the build quality might let you down.

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Casio surgió fabricando calculadoras, y en mi vida de estudiante tuve unas cuantas: FX-17, FX-82, FX-180, FX-4500, FX-6300, ... Ahora que ya no estudio, necesitaba de una calculadora avanzada, es decir más potente que las típicas de sobremesa, o del móvil, por lo que me incliné por este modelo, que al ser solar, haría que siempre estuviera disponible y operativa. Lo malo de esto es que su alimentación es dual, es decir las pilas incluidas, y la célula solar, por lo que no se cuanto durarán las pilas, o si cuando trabajo con ella la energía la obtiene de las células solares, o bien de las pilas. Es un punto importante para mi, pues me gustaría que fuera capaz de operar 100% en modo solar. Veremos cuando se agoten las pilas (espero que de aquí a mucho tiempo), si es necesario cambiarlas, o puede funcionar sólo solar. Hay modelos más económicos que esos 16 €, que me parecen sin ser baratos, razonables al menos. Por lo demás multitud de funciones, de hecho muchas más de las que necesito, a pesar de ser de gama media/baja, muy sencilla de utilizar, y con un display que incluye bastantes representaciones gráficas. El material plástico de la calculadora y la cubierta incluida, da impresión de barato, pero como no la voy a ir llevando de un sitio para otro, eso no me importa. Lo que quiero es tenerla siempre a mano cerca de la mesa, y acudir a ella cuando deba resolver algún cálculo.

Si comme moi, vos professeurs d'études sup. vous demandent une calculatrice non programmable, sans mémoire, de peur que vous ne stockiez tout un tas de programmes comme au lycée, préférez cette calculatrice à une Casio collège. En effet, on ne peut ni créer ni stocker de programmes sur cette calculatrice (comme demandé dans beaucoup d'établissements d'études sup.), par contre, elle est adaptée aux besoins de ces études : elle contient toutes les fonctions qui sont absentes des calculatrices niveau collège.

Ho acquistato questa calcolatrice qualche anno fa per il liceo, e ne sono rimasto piacevolmente soddisfatto. Una delle caratteristiche che mi ha colpito di più è la vasta gamma di funzioni matematiche che può eseguire (calcoli trigonometrici, logaritmici, esponenziali, integrali, numeri complessi, ecc). Inoltre vi è anche un pulsante per convertire il risultato da decimale a frazione e viceversa e altre funzioni molto utili. Dal display (che ritengo essere uno dei migliori per questo genere di calcolatori) è possibile vedere su diverse righe, sia l’espressione inserita (riga superiore) che il risultato (riga inferiore). L’alimentazione è fornita sia da una batteria a bottone di tipo LR44 che da un piccolo pannello solare, che fa il suo lavoro. Non penso mi sia veramente mai servito ma è meglio averlo che non. Dispone anche di una memoria integrata che consente di salvare facilmente valori e formule, molto utile quando durante calcoli complessi è essere necessario richiamare valori precedentemente calcolati (invece di doverli annotare a matita). Inoltre è estremamente leggera e presenta una custodia rigida in plastica che può essere aperta facendola scorrere verso il basso, e può essere agganciata al retro del dispositivo per un comodo utilizzo. L’unica pecca, se così si può dire, è che il manuale che mi è stato fornito è in lingua inglese, ma cercando su internet si trova facilmente la versione in italiano. La consiglio vivamente a chiunque abbia bisogno di una calcolatrice scientifica di alta qualità, soprattutto per indirizzi tecnici/scientifici.