Casio FX-991 EX classwiz calculator tutorial (perfect for algebra, FE exam, EIT exam)

[@lewist5631]

Just started a level maths, got this calculator, thank you so much for the help man it acc helped me so much

[@hamzahhussain6580]

This year's paper for A2 was bullshit

[@north6660]

Hamzah Hussain, lol just look at student rooms, and also sign the petition thats up, it went from 2k to 10k in a day

[@hamzahhussain6580]

@@north6660 that petition won't do anything. I learnt all of a level maths myself with no teacher. I had a textbook that was supported by edexcel and they put questions that aren't even taught in the text book

[@north6660]

@@hamzahhussain6580 yeah I thought that also, but people are still trying, edexcel gave us one thing for 2 years that was not of any use in the papers, today's paper (3) will also be a nightmare.

[@hamzahhussain6580]

@@north6660 yep just found out yesterday about the large data set. What bullshit. But luckily with this calculator you can covert values with shift + 8. They might ask to convert certain units like mph and knots. And all the locations of where the weather was taken. 5 places in UK and 3 internationally. Perth, a place in the USA and China

[@gaius_marius]

Very nice overview of the FX-991EX. I have this calculator, and there are so many functions that it takes awhile to know how to use everything.

[@saujanyapoudel8910]

KZbin channel 'The Calculator Guide' has many videos of this calculator. Detailed tutorials that saves ton of time

[@kasiorap]

mine just arrived, ive been using an older model for years throughout school and freshman year of uni and i needed an upgrade, this one is totally worth it

[@luiferreira8437]

I'm in love with this calculator! OMG!!

[@blackpenredpen]

I fell in love with it too since my student told me about it.

[@aadilshaikh2499]

youre a teacher ? >

[@evaeva3062]

yassss

[@sleetskate]

I told my mom to get me a scientific calculator, she comes home with casio fx-991ex. its been a year and it still amazes me to this day.

[@mehwishbhatti6207]

Got this for my additional maths and it's a charm. Absolutely love the display and the menu, it's just brilliant. It's my main calculator as my old casio one just looks to shabby. Came here to learn other features, unfortunately didn't really learn anything but I do love a maths enthusiast

[@gary3ward]

I love that it keeps answers in the exact form as long as possible. I also like that it treats 2(x+1) or 2(radical)3 as (2(x+1)) and (2(radical)3)) like I am used to even inserting the extra parentheses. EquaserTV on youtube has a series of 13 videos on this calculator that covers all the modes. I love the separate 'X' key and that 'Shift' + STO(recall) shows all the memories and the values in them in case I forgot which one to use!

[@davids9139]

I have the fx-115ES Plus and I'm getting a fx-9860GII for Christmas. I'm a big fan of all calculators. I really like Casio and TI. The joy of understanding math and it's practical applications is an awesome gift. My college makes sure we understanding how to solve math questions without the calculator. It makes one appreciate the use of a calculator so much more. Thank you for making these videos.

[@blackpenredpen]

You're very welcome. I am glad that you enjoyed my videos

[@christianrodriguez823]

This is actually such a cool calculator, id be the coolest kid in multivariable calc next semester if I rolled up with this bad boy (my uni doesn't allow graphing calculators so this is a sneaky alternative :D)

[@blackpenredpen]

LOL COOOOL!!! Best of luck and happy holidays!

[@christianrodriguez823]

blackpenredpen Thanks same to you! (The holiday part, not the luck part 👍🏼)

[@hishamshakil5790]

I have been watching your videos for a while and they help for my maths classes here in the UK. Thanks for these! I don't really need the calculator but it's great that you're doing this giveaway!

[@blackpenredpen]

Hisham Shakil I am glad to hear, thanks for watching my vids. This video is mainly for fun and it's also Bc it's Xmas time. :). Happy holidays

[@laptech3767]

Used this calculator from middle school all the way to college ! Doing calculus now and this still a charm !

[@blackpenredpen]

IT HELPS YOU TO HATE MATH LESS!

[@pykeselslayer]

blackpenredpen The bee movie but eveytime they say bee it plays every blackpenredpen video backwards and every time he says x it plays it plays the outro but 10 decibels louder and pitchshifted down 3 octaves 40 times.

[@teferiboi7771]

I have a feeling that ur gonna win the calculator

[@blackpenredpen]

haidar fakih Lui already has 56 likes

[@luiferreira8437]

I'm asking to all my friends to like my comment! Here in Brazil it's very helpful and expensive

[@blackpenredpen]

Lui Ferreira cool I see. Best of luck. You are winning the race at the moment and keep it up!

[@blackpenredpen]

It's about one more week left till 12/31

[@blackpenredpen]

yea, me too

[@bigdavidsmith7]

blackpenredpen can I play Tetris or any other game on this calculator???????????????????

[@joshharrison9244]

Please, I am desperate for a classwiz and have always looked up to you.

[@randomshots]

@@bigdavidsmith7 its non programmable. So it's not possible to play games on it.

[@navinsaxena7060]

Av v a av. V v v a a b. S BC. C. S. S. V v vvv vvvvvvvvvvvs sbs av v vvv vvvvvv a. V vvvvva àaaa. S ß. Á s à@@bigdavidsmith7

[@ethanclark4116]

There is a joke about a deranged mathematician who would frighten other inmates by screaming "I'm going to differentiate you!" One inmate remained calm and said "I don't care, I'm e^x."

[@blackpenredpen]

Ethan Clark lol classic!!

[@lactatia235]

we dont speak math language here

[@giovannimasci7606]

Unless he is going to differentiate them by y, there is nothing to laugh then...

[@MosesPeru]

@@lactatia235 😂😂😂😂

[@elpumatejada]

I gonna start studying enngenering next semester this would really help me

[@akhileshprajapati2591]

I'm from India And am buying this calculator because now am Btech student I just to know to use this and from your video i get it Thanks alot 😇

[@davidcarrascal]

You look like a great person, thanks for everything you do unselfishly, I can afford the calculator thanks to my work, give it to anyone who needs it more than I, thanks again :) happy holidays

[@blackpenredpen]

David Carrascal Acebron Thank you. Happy holidays!

[@blackpenredpen]

Btw, u still got my like.

[@AhnafAbdullah]

Awesome :D I already bought this calculator and have been using it for a few months, it's awesome for Pure Mathematics and Mathematics B, although I also use it for Accounting

[@dogwalk3]

can't find these anywhere anymore! there's a bunch of fake ones selling for big money like crazy now. happy to have one & finding these 7 year old videos helpful 🙏

[@joy3681]

Infelizmente a casio não produz mas esse modelo, consegui a versão fx-570lax que é igual a essa só que sem painel solar mas já esgotaram. Agora só produzem a cw

[@conflictclips]

@@joy3681 the cw is so bad with all the menus

[@sunnysharma5166]

My same to same calculator and same result as you did sir .it will be very helpful for myself in upcoming future

[@TheCalculatorGuide]

It's a fantastic calculator. Very user friendly with lots of features. Nice Video.

[@blackpenredpen]

Thank you. I also see that you have many nice calculator tutorial videos as well. Keep it up!

[@doria_bolognese]

Your videos bring me a lot about the sense of integration, such as D.I. Method. Perhaps, this channel also brings me some trick about trigonometry identities, it enlighten my mathematical sense . Despite Hong Kong's schools are not allow to use this type of electronic calculators, I really want to say thank you to you.

[@blackpenredpen]

Jade Pang thank you for watching my vids. Best of luck in your studies.

[@jinx1120]

Far and away, this is my favorite calculator!! Thank you for this easy breakdown of these great functions!!

[@jaze0187]

So excited for this calculator. Just bought, first stop: statics, applied differential calculus and physics. Hopefully my head will stop hurting

[@zorro1906]

You deserve 100k likes for this video not 1.1k Thank you so much for tutorial

[@sovietxlr]

Your method on partial fractions made me score maximum on my test. It would be really helpull to get my hands on one of these.

[@blackpenredpen]

Felipe Lopes I am glad to hear. Thank you

[@tonycelestro1959]

I replaced my TI with a Casio fx-115 ES about 9 years ago and its still working. But it would be nice to have a new one.

[@korenemcdow9573]

Awesome calculator! I hope I win! Also, thank you for your Casio FX-115ES Plus tutorial. I am taking my FE in a few days and your tutorial really helped me learn to use my calculator.

[@blackpenredpen]

Ms McDow thank you. And best of luck on ur FE exam!

[@dexternavejar8365]

"Wouldn't it be niiice" to have a brand new Casio calculator? 😄 Love your videos. Best of wishes to you. Merry Christmas, and a Happy New Year!

[@blackpenredpen]

Thank you!And I like your "wouldn't it be nice" quote! = ) Happy holidays!

[@aqeeladanish9907]

THANK U DUDE, I HAVE END OF SEMESTER TEST AND HAS EQUATIONS AND FUNCTIONS. AND I CAN U THIS CALCULATOR. BYE GUYS 15 MINS THIS TEST GON START

[@norbert7297]

oh boy, im gonna destroy the next exam with this soooooo much!! Buying mine today! i wish i knew these things existed..

[@alondrarocha8644]

this helped a lot! i just got a one and i didn’t know how to use it for my final exam!

[@LisaFly652]

You make math easier to understand. I should have bought this calculator!!!!

[@blackpenredpen]

LeekaLisa thank you. Yea you should consider getting this calc

[@AprendizDeLoQueToca]

Great vid and vibe. Thanks bro 🙂🙏

[@davidbrooks8621]

Excellent exercise demonstration for new students

[@LearnWithFardin]

This is really cute bro!!! Thu not two! 💝💝💝💝🇧🇩

[@michaelthegreat1]

i'd share this comment if i had friends to share it with...

[@what3vaaa251]

You are a super awesome professor!!!!

[@blackpenredpen]

Melia thank you Melia. Hope everything is going well for you.

[@godfreyhamshire]

Enjoyed your channel, we have learned a lot from you, keep up the good work!!!

[@blackpenredpen]

Godfrey Hamshire thank you.

[@rubenciapararodriguez1700]

sweet baby jesus, that calculator is amazing!

[@blackpenredpen]

IT IS!

[@studytv6144]

Thankyou so much for This! Just got mine today and I'm excited to use it 😁

[@fet1612]

The calculator is cool. Your tutorial are fantastic.

[@Genocidechaos]

Love your videos and good luck to everyone else

[@blackpenredpen]

Genocidechaos thanjs

[@babysealclub11]

I like this calculator but one huge draw back is that when switching modes or turning it off, your previous calculations/ functions are erased. ... You can't even multi task. The Ti36 pro can. If Casio can add that ability to their next scientific calculator it would be awesome! I really like this calculator but having to reenter large functions is painful.

[@ItsTopCat]

that is one sexy calculator, I hope someone who really needs it gets it :)

[@MONER0]

thank you man that helped me alot Iam from Egypt and that calclutor is cheap and it gives me the solutions in Arabic it costed me only 380 pounds

[@maariyah6944]

U do know that this video was in 2016...

[@liamtaylor3576]

Defiantly getting one of these for my exams next year

[@jaze0187]

and? whatcha think

[@imperialrecker7111]

I prefer this over my ti nspire. It can do anything my ti can. except graphing equations. Highly recommend to pick this calculator up

[@louismackinnon9943]

I need this for stability calculations on my ship, yah know so we don't sink not because I won't have to do it all long hand 😂

[@krisnasaputra4340]

COOOL ! I want that calculator right NOW !!!

[@umutorwhatever]

thanks for the tutorial man!

[@anthonymanotoa2546]

Wow I love this calculator, really. My friends and me talk all the time about the "Chino" with 2 pens in one hand that speak on a ball haha, he help us always. Like and I send u love :v

[@blackpenredpen]

Anthony Manotoa lol. Thank you! Just wondering which school do u go to?

[@anthonymanotoa2546]

blackpenredpen I study in Loja, Ecuador haha in a university calls "Universidad Técnica Particular de Loja" (UTPL) I study civil engineer

[@blackpenredpen]

Anthony Manotoa oh wow!! KZbin is so amazing that my videos reached to you guys!

[@vedakrishna7526]

you just helped me soo much thank you!!

[@michalchik]

I think I still like the Casio 115es plus better. I didn't see any functions on this one that the 115 does not have and the function layout is more intuitive.

[@randomdude7982]

This can solve polynomials up to 4th degrees and handle matrices of 4x4 order. The "OPTN" key will save you lots of time in matrix or vector mode because all the options related to the mode can be accessed without having to press "Shift" and one of the numeric key.

[@terimyers6872]

I love your videos! We are not allowed to use graphing calculators but this would be acceptable.

[@blackpenredpen]

Teri Myers great! Hope it helps!

[@myoung1445]

What sort of jacket does Mario wear? Denim denim denim

[@blackpenredpen]

lol!

[@super-engineer8437]

Hahaha good one!

[@adrboe3027]

I have my final high school exam tomorow, this was so helpfull! I can only wonder why our teacher didn't show us all the awesome features

[@blackpenredpen]

: )

[@teferiboi7771]

By liking u are ensuring that the derivative of my like function is positive thank you for liking

[@blackpenredpen]

haidar fakih yup!

[@sirocoland]

It's awesome. I need one!

[@shortclips9840]

it's very relaxing you're using background music while teaching. may i know the title please? i really want to listen to it while reviewing it relaxes my brain.

[@Argletrough]

Using this seems like cheating; I'm going to try to avoid using most of these functions. This calculator is just too good!

[@gurdwarananaksarbirmingham1063]

Thank you really appreciate your guidance

[@odelyagrace]

Great and helpful tutorial!

[@josejefin01]

Is there anyway you can integration without a range?

[@sharegreats2157]

This appliance is so intelligently built that I'm afraid that Japanese students may lose their outstanding ability in maths.

[@joshharrison9244]

Simmer down

[@rgrtrb3746]

Just a small question on the spreadsheet; If I write some data on the spreadsheet and I turn off the calculator, when the power back up the numbers in the spreadsheet are stored or deleted?

[@randomdude7982]

It is deleted when you turn it off and that's a big minus point for this calculator.

[@Mhmhind]

Lol this is cool I use this calculator and everyone gets amazed when they see it

[@randomdude7982]

Same here. Every dude of my class make up an excuse to use my calculator and it makes me feel really cool

[@shennylimeta819]

I love that calculator. I don't have it for lack of money. It would be great if I won. Anyway, thanks for your videos even if I don't understand English perfectly, I understand you better than some teachers. (And sorry for the bad writing, I still don't speak the language well). ✌🏻🐢

[@blackpenredpen]

Shenny Limeta I understand perfectly. Thank you for watching my videos.

[@mariannafinks1002]

Hello i want to ask you something, I'm trying the integrate but my result is 4 2/3. Why? Also i tried 8-2i/5+2i and my result is 32/41-1 1/41i ?

[@calcul8er205]

Notice me, sinπ

[@what3vaaa251]

Calcul8er 🤣 very good!

[@DivineDragonCrisis]

does this calculator have the feature of step-by-step backtracking like the Casio fx-115ES PLUS?

[@randomdude7982]

Yes! In fact, it has lots of similarities with the 115 es, kind of like brother calculators.

[@electroquests]

Hello blackpenredpen, your videos are great and really helpful!!! Can you please make a video on how to use Casio 991ex to solve matrices?

[@twingray]

Thank a mil. You help me out a lot

[@prog_demos]

Amazing tutorial, thank you! I guess 17 people couldn't have afforded this calc lol

[@telomereo]

Im procrastinating on a whole new level

[@sidharthpatro2106]

Sir plz solve some determinant and matrix problems

[@cynthiaj.simmons870]

"Cool Video!!!" 🙂🙂🙂 I bought one of this cool calculator at my local Walmart today on sale $9.00 it said $11.00 on the package but it scanned at $9.00 I'm not much mathematically inclined but for some advance functions I'll be needing it for crafting and sewing it's pretty cool to have.

[@joshharrison9244]

Please may you give me the location of said "walmart". That is a bargain if I've ever seen one, my local only sells them for $10.

[@xanh350]

Can I ask, anyone can answer at this point, is this calculator better or the fx-991ES ?

[@loreenfernandes7974]

Thnkx alot really helped But wt about the xl sheet present in tht calculator. 😅

[@evolve2survive324]

hello, can you advise , does this calculator lose the data in its memory if you switch operation or turn off the calculator ?

[@randomdude7982]

Yes, it loses all the calculations history unless you have the value stored in one of the variable memories (The alphabets like A,B,C etc.). Input the value you want to store and press "STO" then press one of the buttons in the 3rd row (for example A). The next time you need that value, you press alpha and that particular button.

[@vihangaakalanka1981]

ok cal is great bt my question is how did you manage to migrate to us?

[@2010RSHACKS]

I have a ti-84 so I don't need this. I hope it can go to someone who really needs it for school

[@LesDominic]

Hello! Is it possible that you make a video or two about what this calculator can do? I read the manual anddddd let's say it doesn't tell you everything hahaha.

[@randomdude7982]

Check out The Calculator Guide's channel. It has several videos of doing A-level math with this calculator.. kzbin.infovideos

[@Inferno-ob9td]

What about if the exam question is asking for working out aswell, for example the quadratic equation??

[@justanormalyoutubeuser3868]

You are supposed to know how to do it

[@ungodlygrace3216]

Hello, does this calculator save a history of recently performed calculations?

[@randomdude7982]

As long as you not press "On" button or turn it "Off", it does save it in the replay memory otherwise, it simply will be gone.

[@NotoriousFear]

I like turtles!! 🐢

[@blackpenredpen]

OMG I DO TO!!! I USED TO HAVE ONE WHEN I WAS A KID!

[@Jenab7]

Casio should put computer algebra system on their scientific calculators so that it can show analytic integral and derivative solutions, instead of numerical evaluation only. This should be possible even for difficult integrations because there are already websites that can do this. Also, it is possible that there are functions (well-behaved smooth ones) that this calculator cannot do even numerically. Try to integrate this: ∫(c,a) [b(1/x−1/a)]⁻⁰·⁵ dx c = 6.959e+08 a = 1.496e+11 b = 2.654e+20 The analytic solution of the integrand (without the limits) is √(a/b) { √(ax−x²) + a arctan √(a/x−1) } When you put in the limits, the result is 5578381.9098326220749537677322663 This calculation is for the amount of time (in seconds) that it would take for the Earth to fall into the sun, if somehow its transverse motion were stopped, and it began to fall from rest at time t=0 toward the sun. The variable c is the sun's radius. The variable a is the initial separation between sun and Earth (when they are momentarily at rest). The variable b is twice the sun's gravitational parameter in MKS units. But try to make the Casio fx-991ex do this integration, even numerically. I don't yet have one of these calculators, or I would do it myself. If you succeed, I will be impressed enough to buy one of them.

[@okaro6595]

Symbolic integration and derivation would likely cause them to be banned in exams.

[@Jenab7]

@@okaro6595 I'm not in school any more. Also, I didn't complete the symbolic integration in my example problem. To remove the singularity at x=0, you can replace the arctan function with the equivalent arccos function, like this: ∫(c,a) [b(1/x−1/a)]⁻⁰·⁵ dx = √(a/b) { √(ax−x²) + a arctan √(a/x−1) } = √(a/b) { √(ax−x²) + a arccos √(x/a) } You should do this because, whereas you and I know that the arctangent of infinity is pi over two, a computer will only see a divide by zero and stop working. You can work around this by using an if-then-else control loop, with special exception for x=0, but that's more code than necessary. Just use the expression with the arccosine function.

[@muznaaijaz5179]

3.40 we can solve log in complex numbers mode?

[@ralphwv]

Great video, thanks a lot.

[@clayton3518]

very nice calculator, when I grow up I will buy that

[@RansomUsername]

Wow, what a nice calculator!

[@blackpenredpen]

it is!

[@mydramaspace8240]

very helpful! thanks a lot!

[@GenesisRussell-jt2rp]

is there any reason to upgrade from an fx-115es plus?

[@randomdude7982]

The UI is much simpler and user friendly especially when you are doing conversions. Unlike 115 es, You don't need to look up conversion no.from the calculator cover, you just choose it from a list on the screen.

[@sharonheard2619]

Thank you so much for your knowledge! You have an awesome ability to make things so much easier for me!

[@ceejay706]

I need this for my Basic Calculus subject i'm buying it next week

[@ceejay706]

Update: I fuckin bought it already, fuckinnn nice

[@primacatherina]

Thank you.. ini sangat membantu

[@ghoulghoul]

Q: What do you call friends who love math? A: algebros Happy holidays algebros!!

[@blackpenredpen]

Ţinc Cristian thanks algebro!

[@TheSrijith2]

Hi there.. is it possible to format the columns or rows of spreadsheet as in excel? Like if I want to calculate the duration which is difference between start and finish date. So I want to know how to enter the dates in date format

[@evolve2survive324]

in the market for a new calculator : casio fx-991 ex or texas instruments ti 36x pro. Which should i get ?

[@hulk8889]

Does it calculate inverse of 4 x4 ?

[@jameswalker8030]

Yes it does.