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CASIO FX-991EX Advanced Scientific Calculator (UK Version) £13.49 at Amazon Prime / £17.98 Non Prime
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CASIO FX-991EX Advanced Scientific Calculator (UK Version) £13.49 at Amazon Prime / £17.98 Non Prime

£13.49£14.9910%Amazon Deals
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Posted 22nd Jun
CASIO FX-991EX Advanced Scientific Calculator (UK Version), best price I could find, usually well over £20.
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Good calculator, still use it even though I am done with uni
Edited by: "RaiKush" 22nd Jun
This is THE calculator for A' Level maths and is suitable for use in GCSE maths too. This is a great price. If you have kids starting either GCSE or A' Level maths from this September and they haven't got a calculator, this is a no-brainer. In fact, if they already have a different calculator (the one you see on offer for £7-10 in supermarkets) get them this one.

There is some out of date debate online regarding whether this device is acceptable for GCSE. Ignore it. This calculator is within the guidance rules and was used by most students in my son's school this year.
Edited by: "89quidyoucantgowrong" 22nd Jun
89quidyoucantgowrong22/06/2019 15:00

This is THE calculator for A' Level maths and is suitable for use in GCSE …This is THE calculator for A' Level maths and is suitable for use in GCSE maths too. This is a great price. If you have kids starting either GCSE or A' Level maths from this September and they haven't got a calculator, this is a no-brainer. In fact, if they already have a different calculator (the one you see on offer for £7-10 in supermarkets) get them this one.There is some out of date debate online regarding whether this device is acceptable for GCSE. Ignore it. This calculator is within the guidance rules and was used by most students in my son's school this year.


Agreed, great that you don't have to pay over the odds to get them from abroad anymore.

As you say, totally legal for exams because the functions that would stop it being legal need a smartphone to use with it which you can't take into exams. Saw my eldest through further maths a-level and he's now using it at uni.
Edited by: "b1g1an" 22nd Jun
Was told by my lad’s teacher last week to get this one. Cheers
I did check, and this one is the updated one for exam not the 83 or 85 ones, hence why I got this; I did pay over £20 in January for my nieces, but this time around it's for me lol
Casio CG50 is what you want for A level maths
Maths teacher here checking in. This is a great price - normally £20-25.

1) These are GREAT but not necessary for GCSE Maths.

2) These are REQUIRED for A Level maths - if you know someone starting A Level maths this September they should pick this up now.

You don't need a graphics calculator for A Level maths although it can be useful in a very small number of cases if you know they will spend time to learn how to use it properly.
Athia22/06/2019 18:46

Maths teacher here checking in. This is a great price - normally £20-25.1) …Maths teacher here checking in. This is a great price - normally £20-25.1) These are GREAT but not necessary for GCSE Maths.2) These are REQUIRED for A Level maths - if you know someone starting A Level maths this September they should pick this up now.You don't need a graphics calculator for A Level maths although it can be useful in a very small number of cases if you know they will spend time to learn how to use it properly.


I had a graphical calculator back in 1991 which came in very handy for "sketch the function..." exam questions
badheadday22/06/2019 18:54

I had a graphical calculator back in 1991 which came in very handy for …I had a graphical calculator back in 1991 which came in very handy for "sketch the function..." exam questions


yeah it is very useful. you would have to show working out but its great for checking answers
badheadday22/06/2019 18:54

I had a graphical calculator back in 1991 which came in very handy for …I had a graphical calculator back in 1991 which came in very handy for "sketch the function..." exam questions



The problem is that there are very few 'sketch the function' questions. Might be 3-5 marks out of 300 so up to individual circumstances whether that's worth the £100-120 investment. I've also seen lots of students have a graphics calculator, never learn how to take advantage of it, and revert back to the £15-20 ones so it ends up being a total waste.
Athia22/06/2019 20:03

The problem is that there are very few 'sketch the function' questions. …The problem is that there are very few 'sketch the function' questions. Might be 3-5 marks out of 300 so up to individual circumstances whether that's worth the £100-120 investment. I've also seen lots of students have a graphics calculator, never learn how to take advantage of it, and revert back to the £15-20 ones so it ends up being a total waste.


Depends what you're studying I suppose. I found it useful anyway and it didn't cost as much as you suggest. However, it depleted batteries at a fair old rate.
Athia22/06/2019 20:03

The problem is that there are very few 'sketch the function' questions. …The problem is that there are very few 'sketch the function' questions. Might be 3-5 marks out of 300 so up to individual circumstances whether that's worth the £100-120 investment. I've also seen lots of students have a graphics calculator, never learn how to take advantage of it, and revert back to the £15-20 ones so it ends up being a total waste.


its 30 if you buy from your school
Athia22/06/2019 18:46

Maths teacher here checking in. This is a great price - normally £20-25.1) …Maths teacher here checking in. This is a great price - normally £20-25.1) These are GREAT but not necessary for GCSE Maths.2) These are REQUIRED for A Level maths - if you know someone starting A Level maths this September they should pick this up now.You don't need a graphics calculator for A Level maths although it can be useful in a very small number of cases if you know they will spend time to learn how to use it properly.


Which part of the A-level syllabus specifically requires this calculator over the fx-83/85?
doggerthecat22/06/2019 20:28

Which part of the A-level syllabus specifically requires this calculator …Which part of the A-level syllabus specifically requires this calculator over the fx-83/85?



Statistics stuff mainly - it calculates probabilities for the normal distribution and binomial distributions for you. The normal distribution tables aren't in the formula booklet anymore so you actively need this calculator.

Nice to have: it solves quadratics and cubics, some simultaneous equations, does lots of other statistics calculations (that you could do by hand -- but why would you?) and can do numerical differentiation/definite integration so you can check answers easily.
apollotheninja22/06/2019 20:23

its 30 if you buy from your school



Not where I work - is this the new colour FX-CG50 (£100-£120) or the older black and white 9860/9750s (around £50-70)?

Wouldn't recommend the 9750s anymore as they are really showing their age with lack of natural display.

Graph output on the CG50 is much clearer as it's a proper colour display.
Athia22/06/2019 21:11

Not where I work - is this the new colour FX-CG50 (£100-£120) or the older …Not where I work - is this the new colour FX-CG50 (£100-£120) or the older black and white 9860/9750s (around £50-70)?Wouldn't recommend the 9750s anymore as they are really showing their age with lack of natural display.Graph output on the CG50 is much clearer as it's a proper colour display.


its the CG50 - i believe your sixth form needs to be working with casio in some way. most colleges or sixth forms sell them for 30 i believe
Whats the difference between this and 991ESplus?
You can get this cheaper on eBay but look out for fakes. Make sure it says Casio FX-991EX. There’s a copy sold by the name of just FX-991EX which doesn’t have all the functions.
Excellent - needed to buy a spare one - HEAT!
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