Many schools recommend a certain model of calculator and some will sell you one, making a handy profit for the school, but the model of calculator is not a choice a pupil should have made for them.

The calculator most recommended by schools is the Casio-83ES. This is a natural notation calculator and displays a calculation on the calculator screen to allow it to be easily checked. Square roots are simplified and displayed and answers are given in terms of pi in many cases.

Like all Casio calculators, it will tell you that -3 squared is -9 and 20+10% is 20.1. Both of these are incorrect but many people believe it because they think the calculator cannot be wrong. Simple four function calculators like those found on mobile phones and old fashioned calculators that use reverse polish notation (rpn) do not have this defect. Neither do many calculators made by sharp, whose calculators have all the functionality of Casio calculators.

Casio do however, produce probably the best calculator in the world – the casio FX-991ES PLUS. This is the calculator I recommend to all my students. It has all the natural notation features of the Casio-85ES and also has quadratic and simultaneous equation solvers built in, and a general equation solver which often makes it unnecessary to rearrange equations to find the solution. I reckon for the average student it makes a difference of 5% in the calculator exam, and costs from £13 on amazon.

Believe it or not, this calculator is exam legal, accepted by all exam boards. It does not perform symbolic manipulation, like simplifying x(x+y) – that would rule it out for use in exams.

### Recent Posts

### Recent Comments

### Archives

- May 2019
- March 2019
- February 2019
- January 2019
- December 2018
- November 2018
- October 2018
- September 2018
- August 2018
- July 2018
- June 2018
- March 2018
- January 2018
- December 2017
- November 2017
- October 2017
- September 2017
- August 2017
- July 2017
- June 2017
- May 2017
- April 2017
- March 2017
- February 2017
- January 2017
- December 2016
- November 2016
- October 2016
- September 2016
- August 2016
- July 2016
- June 2016
- May 2016
- April 2016
- March 2016
- February 2016
- January 2016
- December 2015
- November 2015
- October 2015
- September 2015
- August 2015
- July 2015
- June 2015
- May 2015
- November 2014
- July 2014
- April 2014
- March 2014
- January 2014
- December 2013
- November 2013
- September 2013
- August 2013

### Categories