CASIO CLASSWIZ fx-991EX - 6 Things Students Forget You Can Do

I take a look at SIX things students forget you can with the Casio Classwiz fx-991EX.

[@federicoimberti]

I think schools should dedicate more time in explaining how to properly use a scientific calculator to check one’s results, thanks for the tips!

[@ebykurian854]

I Totally agree with you

[@janani1826]

I agree! Not just in maths but in any subject that uses the calculator. I get that students might overuse which is the classic excuse but they have to show their working so it shouldn't really matter in my opinion

[@erynmarpaung9689]

That's what I've been doing in my math class

[@melodyabcdefghijklmnopqrst1663]

True.

[@thalenagundersen1206]

The 6 things listed in the video: 1. Calculating solutions of x --- using the 'Solve =' function 2. Converting between different units -- using the 'CONV' option 3. Finding/Checking an equation of a line "y = bx + c" --- using the 'Regression Calculation' function, listed under 'Statistics' 4. Factorising polynomials 5. Generating values for a function, to find the first "n" terms of a sequence -- using the 'Table' option, under 'Menu' 6. Generating values for a function, to obtain an idea of the nature of its graph -- also using the 'Table' option

[@apocalypticbean]

Not all heroes wear capes.

[@pierson9728]

never seen a better value for money calculator than the 991ex.

[@raphaelgaudio]

This explanation is absolute amazing! Thank you very much for the tips!

[@Alex-Projects]

Great stuff for before exam prep, thanks a bunch !!

[@Faith-zp5kf]

Thank you so much, had a question so similar to this in a mock and for some reason didn't check it using this, will definitely do so from now on!!!

[@MathsWithMelv]

You're a star jack, will be sharing with my students 😃

[@TLMaths]

Hope it's useful! I don't often do videos like this

[@janani1826]

Loved this! My teacher/class always make fun of how much I like to use the formula booklet and calculator. :)

[@TheCalculatorGuide]

Nice video Jack, thank you. I especially like the "honing in" Sin x solutions, which I may be borrowing in the future. Good tips all round.

[@royalhydra5455]

Your channel is also best

[@jakubpiekut1446]

Great job very helpful !

[@teabedran7894]

Tanks so much!!!!!!Tomorrow I have a math SAT and this is just what I needed.

[@sophiawatt7021]

such a great video, thank you!!

[@watchingmaths2603]

Thank you very much, Jack! I'm an independent candidate whose been trying to complete the A level in 100 days in time for these exams and your videos have been a huge help. Other than past papers what would you say the best way to revise was as there aren't many past papers for the current spec. (I'm doing the Edexcel course).

[@TLMaths]

The CGP textbook is good. Do all the boards papers, not just Edexcel. Use physics and maths tutor .com for old spec papers. There's madasmaths and naikermaths and crashmaths websites as well.

[@callumcosens9529]

@@TLMaths Crashmaths has made so many edexcel styled papers, I'd highly recomend taking a look at those.

[@watchingmaths2603]

@@TLMaths Thank you! You're a legend for everything you do.

[@watchingmaths2603]

@@callumcosens9529 Thanks mate will do!

[@watchingmaths2603]

@@TLMaths Hi TL, another question for you. On the Edexcel course I know there are two mixed pure papers, I know they mix C1 and C2 but is there anything that distinguishes them at all? Is one paper more skewed towards certain parts of maths or are they basically exactly the same?

[@peroinzimbabwe5842]

You're a lifesaver, thanks mate

[@GeethsMathsTutorials]

Great video. A lot of useful tips.

[@lilsweeny1678]

Very helpful,thanks!

[@tamaskovacs2139]

Thank you, and for your direct response to my comment too

[@williamweatherall8333]

This is a really good video. If I could offer a tip, it would be that for conversions it is easiest to start with the number you want to convert and then press the conversion key

[@brummbar7251]

Damn I wish I saw this before edexcel paper 1 lol. Thanks a lot, it might save me in the next 2

[@mrping9493]

this is a great video, thank you so much

[@AceOfHearts001]

Great video Jack. Thanks. I would personally say that it is worth getting a more powerful calculator for A-Levels. It is a bit more to get used to but the extra features can be a great help in exams (for example, checking all the solutions to a complex trigonometric equation using the graphing app). For GCSE, the trade off in learning to use a graphic calculator is probably not worth it (some common functions become secondary shift operations etc.)

[@M4U_CLLIEW]

Thanks for sharing your knowledge :)

[@antiducktwenty]

Bravo - Good stuff Thanks

[@Waleed-fj9hb]

extremely helpful. i only knew 1/6 before this

[@jeshvinacynthia7537]

This is amazing thank you so much😭❤💯

[@kabir5056]

shift 8 about to me my life saver for mechanics 😂🙏

[@mohammadmunzurulhaque3197]

Thanks Mr. Brown

[@introvertworld8325]

You are just awesome ...

[@bhgtree]

Great video thanks!

[@TLMaths]

Glad you liked it!

[@IGCSETutorials]

Thank you so much.

[@shaimahmood8890]

You are marvellous

[@moveditsyed399]

jack ur a legend

[@adomiiee]

Thank you!!!

[@kshah4361]

This is amazing, thank you so so much!

[@user-ld6rv9fl6b]

Man, i can't thank you enough

[@tmwtheo]

Cheers bro

[@ShowtimeDon]

Thanks bro

[@charliep439]

What are your thoughts on the Casio fx-115ESPLUS2 2nd Edition?

[@coolmonkey619]

Thanks

[@Sheena1234ization]

Bravo

[@gamuchirainmago3328]

nice

[@rossyrivera3757]

I wanted to learn how to use this calculator for Avogadro’s number. I would like to know more about using the scientific calculator for chemistry.

[@TLMaths]

I wouldn't know I'm afraid.

[@freezy2755]

press shift 7 then go to physico-chem and you can find the constant there

[@valentinas8881]

I have a problem with the first example the solve button, I have the same calculator and did exactly the same, when i type 8e^2x-3=15, and then click shift and the CALC (SOLVE) button it doesnt do anything, nothing changes, then i click the CALC without shift and the X=0 comes up, i put X=2 and click equals and I get an error message, is this a problem with the calculator or am I doing something wrong? thank you

[@TLMaths]

When you've typed in your equation and you press SHIFT and then SOLVE, it should come up with x = something. It is asking you to input a value of x to start looking for a solution. Type in a value of x , press equals, and it should home in on the closest solution.

[@anish7183]

You should add this video into the revision tips section on ur website

[@TLMaths]

Good shout - I forgot about this one

[@pietrofavia7835]

Does exist a not graphing calculator that besides calculating derivatives and integrals in a specific point gives me an equation as a result ? P.S: sorry for my ignorance... very few people on the net are so clear and professional in explaining , thank you so much Prof !

[@TLMaths]

You're not allowed to take a calculator into the exam that can do algebraic integration or differentiation

[@pietrofavia7835]

I have already done exams like mathematical analysis, geometry and others. I need to optimize the times in other types of tests like control systems where mathematical calculations are not examined I asked for non-graphic calculators because output like nyquist or bode graphs are not allowed, but there's no problem for a not graphing calculator that gives me mathematical expression of derivatives and integrals. The problem is...does exist a calculator like that? 😅 Thanks you so much anyway !

[@TLMaths]

I'm afraid I don't know of one - it may not exist as it would have limited commercial value when exams mostly wouldn't allow it to be used.

[@phantomr277]

Hi. All year I’ve been using the graphical calculator Casio fx-9860II mainly because I lost my original Casio calculator. Throughout the entire year I’ve used this graphical calculator but I was wondering, should I still buy the original Casio calculator for the exam?

[@TLMaths]

Probably not worth it given the time left if you're happy using it. As long as it does everything you need it to.

[@lokivariant3741]

What is the meaning of starting value(x) in the calculator?

[@TLMaths]

When using the solve function do you mean?

[@okaro6595]

It uses the Newton's method. It needs a starting value, then it replaces the function with its tangent in at the starting value and calculates the root of the tangent. This then becomes the new starting value and it continues until it finds the root. Newton's method is really fast when it works but sometimes it can fail. In the first example if you start at 2 the values are 1,844886976 1,815220847 1,814305169 1,81430433 and that's it. You can do Newton's method even without the solve function but you need to get the derivative. The principle is new x = x - f(x)/f'(x). If you want to do it by "hand", first enter the starting value like "2 =" then enter the x-f(x)/f'(x) using Ans in place of x and then hit = until the value does not change. For example: ans - (8* exp(2*ans-3)-15) / (8*exp(2*ans-3)*2) (The 2 is because of the chain rule). An obvious failure of the Newton's method is if f'(x)=0. This causes a division by zero. Strangely the calculator does not fail on this though it does take somewhat longer. It does something strange, possibly adds some small value to the starting value.

[@abdulmahmood6911]

Is there a video like this for the graphing calculator cg50

[@TLMaths]

Not one by me I'm afraid

[@abdulmahmood6911]

@@TLMaths can you make one pls

[@TLMaths]

I haven't used the calculator enough I'm afraid

[@Lewis-nb7pn]

How do you solve the first log problem?

[@TLMaths]

8*e^(2x - 3) = 15 e^(2x - 3) = 15/8 2x - 3 = ln(15/8) 2x = ln(15/8) + 3 x = (ln(15/8) + 3)/2

[@Lewis-nb7pn]

TLMaths cheers

[@knightrider1850]

in question sinX=0.3 why cant we write the answer as (x=20-->x=17.45) without writing (x=120--->162.5)?

[@TLMaths]

sin(x) = 0.3 has infinitely many solutions. In an exam you would be told to find all of the solutions within a given range, such as 0

[@anonymousefitz8736]

Just wanna ask is it only on the EX Casio version??

[@TLMaths]

You'll be able to do these things on the Casio CG-50, for example, but you'd go about it in a different way.

[@anonymousefitz8736]

@@TLMaths how about the 991ES version would it also work the same way?

[@TLMaths]

The Casio 991es doesn't have all the capabilities of the 991ex. I don't have one to hand, but you will need to get the 991ex at least to study A-Level Maths as the 991es doesn't have all the required features for the course.

[@EricBrunoTV]

Please can you tell me how to do (a+b)^4 ? Thank you.

[@TLMaths]

Not sure what you mean?

[@EricBrunoTV]

@@TLMaths For example (x+2)^5=?

[@EricBrunoTV]

@@TLMaths It can be very useful if for example I have a Taylor polynomial to develop and I have (1/2x^1/3 - x^3)^4. In this case it very easy to make mistakes. But if the calculator can do this, it will be more simple with less mistakes

[@TLMaths]

The calculator can't expand brackets for you. The best it can do is nCr to find the position in Pascal's triangle. kzbin.info/www/bejne/f5m1mWWJf5epoNE

[@EricBrunoTV]

@@TLMaths thank you for the answer.

[@kerstenwatkins1130]

hi struggling to differentiate sec^2x-4/3 on the classwhiz - can you pls give me a clue!! TIA

[@TLMaths]

Use 1/cos(x) for sec(x), if that helps?

[@kerstenwatkins1130]

@@TLMaths for sec squared x ?

[@TLMaths]

Use (1/cos(x))^2

[@babajani3569]

Sir dont you think that the casio fx cg50 is actually slightly better than this. It is easier to utilise I think.

[@TLMaths]

I don't believe it is as intuitive, and it retails at 3 times the price. It does have extra functions I agree.

[@babajani3569]

@@TLMaths well you see luckily, my college was selling it cheaper this year because of covid. It only set 10 pounds more than this one so i guess i was kinda lucky in that sense.

[@nolongerkhan8537]

for the sin(x) one i kept getting syntax error

[@TLMaths]

Are you pressing equals after 0.3?

[@nolongerkhan8537]

@@TLMaths I have no idea what I was doing but after tryinf so many times I got it :') thank you :D

[@Damrs]

Am i allowed CG50 in aqa alevel maths?

[@TLMaths]

Pretty sure that's fine. I'm no expert on what's allowed and what isn't, so you might want to check with casio directly.

[@TheCalculatorGuide]

Yes you absolutely are allowed. Casio published a web page on it education.casio.co.uk/news/tag/exam

[@callumcosens9529]

A calculator will only not be allowed if it does any sort of algebraic manipulation. The CG50 uses all it's functions numerically I believe. I'd make sure you set the calculator into examination mode though, this just blocks any kind of storage access so if invigilators ask to check the calculator, you're not risking anything.

[@AlEx-ro7kd]

yes my school uses that too

[@danishaiman1194]

Is this allowed in gcse?

[@TLMaths]

Yes

[@danishaiman1194]

TLMaths thanks

[@lukesargent9413]

The tools on this calculator are overshadowed far too much

[@callumcosens9529]

Would you ever recommend anyone to get a graphical calculator?

[@TLMaths]

I personally think its very important to learn how to sketch graphs - it links a whole host of ideas together and allows you to visualise what's going on. A graphical calculator can take that opportunity away. I don't ask my students to buy graphical calculators - I only really recommend to those who are really not confident

[@Crazytesseract]

@@TLMaths I agree with you. USians (Americans) rely to much on graphing calculators. Asians less

[@abdowtsmx5709]

Becareful when buying this calculator make sure you buy classwiz the uk version not the german one

[@CS-wy3ze]

How do you know the answers your calculator gives are correct? We have en.wikipedia.org/wiki/Pentium_FDIV_bug. How do I make this calculator recognize IEEE 754 (including Infinity, NaN, and denormal numbers)? I expected bitwise operators like left shift and right shift. Where are those operators in this calculator? Even other calculators without integers like JavaScript and LuaJIT have left shift, right shift, bitwise and, bitwise or, bitwise xor, and bitwise not. How do I treat these value as 32-bit signed integers in this calculator?

[@TLMaths]

All of that has gone right over my head. I suggest you direct your questions at Casio themselves.

[@bandorrr]

im guessing the cs in your name stands for computer science lol just get the fancy graphing calculator you can do python programmign on it and if ur worried about floating point arithmetic then just calculate everything in your head