Casio fx-85GTX Scientific Calculator, Black

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The display on the calculator allows for more readable sums, fractions for example allow you to actually see one number abover the other one instead of using some weird symbol like the calculators when I was at school. The standard GCSE model in the UK for the past seven or eight years has been the Casio Classwiz fx-83/85GT X (centre in the image), though in early 2023 Casio brought out the fx-83/85GT CW, which is very different and which has replaced the GT X (despite a poor reception from UK Maths teachers).

The Casio fx-991 CWis Casio’s most advanced scientific calculator, providing 540+ functions and is suitable for Key Stages 3,4 and 5, to include A /AS level.Similarly, you can no longer jump back to basic calculator mode by pressing 1; you have to use the arrow keys to move the cursor to the right menu option. I’m still using my beloved 1980s Casio fx-451 scientific calculator (which has absolutely minimal key presses even compared with the Casio Classwiz fx-83/85GT models: even the S-D button is an ‘extra-step annoyance’ for me). A particularly annoying one is nCr (to calculate the number of combinations of r items chosen from a set of n – used in binomial expansion and the binomial probability distribution). Casio describes the fx-83GT CW as “the new upgraded version of the Casio fx-83GT X” and the fx-991CW as “the new upgraded version of the Casio fx-991 EX”.

The short answer is that if a calculator is permitted in an exam – at least in England – then ANY calculator is fine *, as long as it’s not one that you can program text into.With 61 KB RAM and over 65,000 colours, It's an ideal companion for budding Mathematicians and professionals.