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A Chinese copy of the well proven Casio fx-991ES. For roughly £8, you get something that has exactly the same functions. It gives answers as surds, pi, or fractions (when appropriate); has equation solving capabilities (solves quadratics, cubics and simultaneous equation with up to 3 unknowns); summation of series; matrices (up to 3x3), vectors, statistical facilities including the Normal distribution, and does differentiation and definite integration. It is also highly compact and dual powered (solar plus battery). For someone on a budget, it's a no-brainer! Why only 3 stars? The calculator's build quality is not as good as the genuine item by Casio, and the processor is slower. That said, however, you'll get the inverse of a 3x3 matrix in roughly 10 seconds; a definite integral in 20 seconds, so some would regard this as knit-picking. Not so, however, with regards to the brand name; 'CTTTZEN' is the name on the front of the calculator (someone's idea of a joke?). I kid you not! Fortunately, it can easily be removed by applying T-Cut. Not so, unfortunately, with the sliding cover, because the name is embossed rather than painted! Also, the sliding cover is a very tight fit; more so than it should be. In summary, yes, great value, but the genuine item by Casio is only an extra £7-£8 and that's not a lot of money these days. The Casio also comes with a 3-year warranty, providing you've purchased a UK model. To most of us, that makes the extra £7-£8, well worth the extra.Read full review
Verified purchase: No
As a maths teacher and Head of Faculty for 30 years I am convinced this is the best calculator for A level (and GCSE) I have come across. It has the easy, intuitive, interface of a GCSE calculator but with all the functions needed for Maths at any level. I particularly love its ability to solve equations, giving solutions to quadratics in surd form, something even the expensive graphical calculators can't do.
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
I haven't even scratched the surface of what this can do. I bought it for computer science, to convert different base numbers. It fitted the bill perfectly.
Verified purchase: Yes | Condition: New
Good quality at a bargain price.
Verified purchase: Yes | Condition: New