Casio FX 991ES

I bought this calculator just over a year ago with the intention of using it in exams, specifically A levels. I was a little worried it would not be allowed at first, because as other reviewers have noted, it is a very powerful calculator, however the only rule set by the JCQ (who regulate A levels, GCSEs and some vocational exams) is that the calculator must not be capable of symbolic calculus (note that this may change in time, but for my session was accurate). However, this calculator is still very powerful. It provides far more functionality than the average user would need. This includes numerical integration and differentiation, which if used by someone ...  Read the complete review

This is an unbelievable calculator and at £8.41 on amazon.co.uk is definitely worth buying if you are sitting any form of maths exam above gcse standard. Firstly when buying a calculator it is important to not get carried away when buying a calculator with a lot of functions just because it has them. However this calculator has a lot of functions which always makes me question how it ever came to be allowed in exams. Besides the basic functions that you would expect from a calculator I have used this for several things all of which are extremely helpful in an a level maths exam. Firstly it will do all sorts of numeric integration, which is great for ...  Read the complete review

This is an extremely comprehensive calculator that contains a huge range of mathematical functions, and is only short of graphics capability. In addition to the normal scientific calculator functions, this model has many notable features and modes. It has a complex mode that supports all basic mathematics on the complex numbers, and is intelligent enough to know that i^2 = -1. When working in the real numbers, the calculator is able to solve equations with one unknown variable. For users in the physical sciences, the calculator has a bank of 40 constants, such as the Gravitational Constant and Avogadro's Number. There are also 40 base conversion, ...  Read the complete review

This is one of the best scientific calculator that you can buy. This scientific calculator allowed me to get through maths and stats a levels. Without this scientific calculator it would have been really hard to get though my a levels, this scientific calculator can be used by anyone, including lower years or even at GCSE. The scientific calculator is very easy to use and has all the buttons is the right place. The scientific calculator has many functions that can be use to solve many problems. I love the fact that the scientific calculator use two types of power, one solar and the other battery. As this way it means that you are ...  Read the complete review

So the Casio (the calulator makers) have introduced the new breed of calculator; the Casio FX 991ES. The calculator is manly used for maths exam above GCSE level due to it's 403 different functions and a 'natural textbook'. This allows you to be able to enter expressions as seen in your text books. With advanced mathematical functionality, the FX991ES is ideal for both students and professionals. I bought this calculator for as a levels to help me sit the exams; as it considered to be one, if not the best , scientific calculator on the market. I was not disappointed as this calculator truely is the best, with all it special scientific functions (there are just ...  Read the complete review