I have a huge weakness for calculators, so if I see a new one that looks interesting, I usually buy it and see if it could replace my current favourite as my “Top Calculator”.

Since the launch of the CASIO fx-83GT PLUS, the calculator market has been, for GCSE at least, a bit of a one-horse race. Several strong features are common across the whole market, they all basically do the job. What sets the 83GT apart is some unique features:

- The ability to factorise whole numbers (The FACT function). This is not only useful, but fun. What can be a dry subject to teach, suddenly becomes an area for experiemntation and competition, which happen to be my two favourite ways to spend time when I’m teaching Maths. The answers are expressed in Index Form so the pupil is taken straight to the gold standard of factorising numbers. So, I use it to teach index notation too. Factorising is crucial for a number of Mathematical areas, so it’s really nice that CASIO think it’s worthwhile to devote a function to it.
- Recurring decimals – well hidden above the “x squared” key, (it looks like a box with a dot on top), this function enables the pupil to type in recurring decimals. Answers can also be converted from recurring decimal, to fraction, to rounded decimal. Again, this encourages experimentation.

It will probably set you back between £9 and £12 depending on where you get it.

Update – June 2015 – still think this is the best.

Click to see recommended compass

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… I go online at my favourite supermarket, wanting my pet brand of Scientific calculator, and punch in “calculator”….

The phone coughs up “65 hits”. Great. No idea this retailer sold so many different types. Hit 1, the one I’m after. Hit 2 is Sellotape.

In which universe can Sellotape be used to assist arithmetic?

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## Bespoke Maths uition for struggling pupils