Mental Math Tricks - Addition and Subtraction in your head!

With this mental math trick you will beable to add and subtract in your head rapidly - a critical skill in everyday math. In this video we look at tips on how to do basic addition and subtraction instantly without using a calculator. Fast math is good math!
To donate to the tecmath channel:paypal.me/tecmath
To support tecmath on Patreon: / tecmath
To buy tecmath mechandise: teespring.com/stores/tecmath-...

[@derrickgordon2781]

im good with math, if i have a paper, but if im forced to do it in my head, man, i feel dumb. especially today at work.

[@Pasenadi4Real]

I hope you've improved.

[@everythingnice949]

Same.

[@miramira7031]

Same bro same

[@picklexp1161]

Idk how but im the opposite

[@shakavibes1]

Yes I'm like that.

[@lauraenright3667]

In the middle of adding in my head i forget the numbers

[@avacado_fan4660]

same...

[@kylah6435]

SAME!

[@Novoabhi]

So do i

[@Kilogya]

Smaller brain maybe. Jk please dont take this seriously cause I do have this issue with long addition and subtraction. This method work for me.

[@mr.charming6815]

@@Kilogya nah big brain

[@niallspotat0e823]

i’m in college and a math major and yet i’m watching this because i never learned how to add and subtract numbers mentally yet i can do calculus like nothing

[@karisima6060]

Did you learn yet?

[@niallspotat0e823]

@@karisima6060 i never practiced it so no 😂 but i think i am doing better

[@la4381]

...i'm here and i can't do any math at all. idek why i'm here 💀

[@niallspotat0e823]

@@la4381 subtracting and adding is a basic life skill we must learn 😂

[@la4381]

@@niallspotat0e823 the career path i have chosen gives me immunity from needing such skills. it's called being a professional, full-time bum. get on my level

[@xmanofficial]

For those struggling with doing math in their head, I recommend using an app called “Mental Math” You have the option of doing (Addition, Subtraction, Multiplication and Division). There’s 3 different levels to choose from, so you can start on whatever you feel comfortable with. I myself use the app since i’m struggling myself.

[@sweetpotato5784]

there are many apps with that name so whichone

[@xmanofficial]

@@sweetpotato5784 It should say “Mental Math Cards Games & Tips”

[@VINAYKUMAR-dx1oh]

@@xmanofficial not available with this name kindly share the link bro..

[@ellidominusser1138]

Thanks dude

[@bruceshark0]

@@Yeetedaway Ive been using it for about a week now and have definitely seen improvement.

[@honeymelon138]

this is a literal insecurity of mines and its so embarrassing because im 17 :/ I've had numerous occasions in school and at home where i got put on the spot and i couldn't answer correctly. I would get anxious when people would ask me to work it out orally rather than having it written out infront of me, its so weird because once i see the numbers written under the next i start working it out visually and i answer in less than 10 seconds but when someone asks me its like 1-2 mins.. because i have to ask them to remind me of it like 3 times and then i start acting fidgety and start all over again if they watch me like "is she fr.." ugh! I just really want to learn how to focus on bettering my mental solving skills because i am so fascinated by the quickness of it with other people and also because i never wanna experience that kind of embarrassment ever again LOL. So from tomorrow ill be dedicating one hour to ridding this insecurity of mines and ill be coming back to this comment section to remind myself of my progress.

[@chuchub4by47]

Bro im 17 too and im just as bad ima be 18 too and rlly im so badddddd when asked...it takes me more than a min and i get so embarrassed.... i had to calculate 1.67 x 6 in my head and rlly i- just couldnt

[@chuchub4by47]

tell me how ur progress went cuz its an insecurity of mine too and i get scared when asked

[@farhil9082]

Dude Im 24 😂😂 i sucks at changing money

[@harshita4205]

Thats what i go through all day I am very bad at math 🥲 i am 17 and i suck at counting money also

[@psdharshna]

@@harshita4205 yeah me too I'm 15 when someone ask me mind calculation i get anxiety and embrassed .when i want to buy something in shop ,it makes me embrassed so much

[@AlanMcCarthyguitar]

Omg I ve always been so ashamed of my mental maths skills, this was never taught in school to me and caused me a lifetime of torture and yet I can easily work out these with this technique!! With practice one could get really good, thank you

[@diegoO4051]

Are you really good now?

[@mikelee7582]

I found this video looking to find someone have your reaction to someone explaining the way that I handle math in my head

[@lulah3463]

Nice video. In the 43 + 17 example, you say 7 but write 5.

[@gmssg6898]

I was confused right away because of this

[@yoly.pacheco]

Hold on the first problem is wrong, you add 43+5. It should be 43+7

[@poojamehta5421]

Yes u r right

[@Julit93]

Thankyou so much for this. I struggle so hard with maths as it is a big trigger for my anxiety which makes it incredibly difficult to mentally calculate anything. Thankyou for making it something I can tackle!

[@brentzthurmwood3854]

Same here it scares me so much that I run any time money and counting is involved. It embarrassed me so bad. Makes playing manopoly hard also :(

[@benjamindanilov3121]

@RMS Education Self promoter

[@wolawheops6401]

omg i thought it was just me.. i feel so dumb asf.

[@ape1755]

yeah

[@lil._.nezuko6645]

I thought it was just me I honestly feel kinda better knowing i'm not the only one lol

[@kingkai5821]

God bless you, thank you. Personally, I've struggled with mental math (math in general) my entire life as a student. Now starting my own business as a 20yrold, I've finally decided to take my mental math game seriously. Again god bless 😚😍

[@nathanielramos5338]

You are not the only one bro. Im also struggling with this.

[@lowkeysky4431]

*what you learn in school:* nothing *What you learn in google, YT and etc:* anything you can imagine

[@AdamFelibrico]

I've always placed numbers on top of one another because that's how I was taught in school, but this is so much more logical. Thank you for the upload.

[@gregpac9932]

You have a visual error at the 1:20 minute mark. Your audio correctly says to add the number 7 to 43, but your visual shows the number 5 being added. (Visual shows 43 + 5 =50 which is obviously incorrect.)

[@kamalkishore8160]

i know right the ans is 43+5=48

[@onward2727]

Thank you. Was about to write this

[@gagek.2830]

Quarantine is making me scared of myself-

[@iscaylis]

For numbers like 55 + 39 it's easier to round up to make it 55 + 40 - 1 in your head.

[@sadisticgirl_]

55+39=60-5+40-1=60+40-5-1=100-6=94 55+39=50+30+5+9=80+4(5-1)+10(9+1)=80+14=80+10+4=90+4=95 Nice!

[@sadisticgirl_]

42+64=50+70-8-6=120-14=110-4=106 42+64=42+70-6=112-6=106 ______ 78+36=78+40-4=118-4=114 78+36=100+8+6=100+8+2+4=100+10+4=110+4=114

[@sadisticgirl_]

123+459=500+23+60-1=83-1+500=582 721+347=1.000+21+50-3=1000+71-3=168 666+2845=6+30-2=34_66+50-5=34_116-5=34-1_11=3511

[@XiaoPangZi]

@Tobio Kageyama You really are a mean asshole, huh?

[@nemesisk4788]

💀

[@EwigesEis]

4:41 - here's another trick, if you have something like 55-39 it might be easier to do "55 - 40 = 15" in your head and then add 1 (15+1=16) ust don't forget about adding that spare number in the end. Same with: 52 - 38 = 52 - 40 +2 = 14

[@mahaakash3320]

Thank u bro

[@tarun2691]

Thanks bro

[@divyapareet1314]

I also use this at times 😁

[@deliverus6856]

I’ve been out of school for two years and finally decided to do college and I feel like a retard

[@Sophia-vx8yo]

Hi, let’s not use the r word, thanks 😊

[@gracefulwomanyeshua3787]

Same here!

[@kludder]

that word is highly offensive towards mental ppl, pls don’t use it, u know which i’m talking abt

[@olivercripps4422]

@@kludder wdum everyone is so sensitive lmao

[@kludder]

@@olivercripps4422 ??

[@jishaaan70]

He wanted to write 7 just chill guys

[@PK-tn4vs]

Yea he's right

[@bmtdssbmtdss3097]

kzbin.info/www/bejne/qprWh5iCj6mah7M

[@Mosinkhan-dg5sv]

jishaaan tttgg

[@lilithhearts1568]

I didn’t see the mistake and still can’t see is

[@hamburger54]

Lilith Hearts 1:12 - 1:21

[@Disk-Etiquette]

Thank you so much. I was never taught this skill before. I’m going to be doing 20 of these everyday

[@jonathanroche732]

I'll do the same

[@preciouseyes87]

Thank you for this. I’ve been practicing and getting quicker at figuring out the problem. I feel so proud ☺️

[@vesariustheon6251]

I can solve math problems (geometry, algebra, pre-calculus) pretty well, as long as I have a pen and a piece of paper. But I really suck at mental math, even at the age of 17 😂 So this really helps a lot!

[@lizardly6353]

Thank you for this clear and straightforward explanation! I struggle a lot with mental math, even as an adult, and this is a very helpful tip as I try to improve.

[@enoxtic]

When I add math in my head I would carry the remainder to the next number by the time I finish adding 60 mins has passed.

[@misatoykat]

same 💀😭😭😭😭😭😭😭😂😂😂

[@heckler1658]

Learning from a dude that thinks 7 is 5

[@AustinScott-]

Lmao

[@runwithfarhan4435]

😂😂

[@helenborromeo3851]

I am fast at calculating when it comes to paper but mentally I feel dumb and ashamed, especially when people ask me suddenly. I feel horrible lmao

[@iniyangr2811]

😭💯me too

[@sayun7622]

Thank you so much, we get tested on these and I always stress out too much to answer any within the 3 second time limit. But now it’s not so scary!

[@TheHoldsworth]

When does 43 + 5 make 50-

[@anushka7181]

HOW I didn''t get that too-

[@loveeneshinderjeet5738]

Its 43 + 7 = 50

[@pikazu2578]

Its mysterious maths 😵

[@sipped1003]

righttt that’s what i was thinking

[@MazalsCool]

I already feel like an idiot watching this video. Making that typo just confused me even more lol

[@nikoruhana4737]

it's easy when you concentrate, but in real situations I always got mental block.

[@sharonjuniorchess]

Practice the skill. Look at car number plates and pick out two numbers to add. The more you practice the better you will get. It might also help to learn number bonds i.e. the number you need to add to a given digit between 1-9 to get 10 (9+1=10, 8+2=10, etc)

[@matthewa6881]

lol 28 years later now I know this simple trick. Teaching myself to be a mental calculator over the next few years. I have learned higher level maths at uni studying finance and in my spare time learning some maths - derivatives, matrices, some number theory, probablity, all of that without knowing this. How embarrassing! I relied way too much on my calculator I think... Thanks

[@Jay-zu6yu]

Matthew A I'm literally on the same boat as you, I feel so embarrassed and ashamed that I'm not quick enough to do mental math in my head, but I'm dedicating myself to be a human calculator also lol.

[@alexgade4512]

@@quabledistocficklepo3597 honestly you sound like the one with issues. The man just said that mental math would've made his studies less embarrassing.

[@quabledistocficklepo3597]

Matthew A, Hmm, you may be right. I'm not going to watch it again to see what prompted my remark, so I'll just delete it. I may have been unjustifiably snarky.

[@aishwaryareddy6162]

This is exactly what's happening with me, using the calculator for finance has made me so relied on the calculator that I actually don't know the basics and it's so embarrassing front of others.

[@quabledistocficklepo3597]

@@aishwaryareddy6162 relied>reliant.

[@marunoise9518]

I'm finding all of your videos very insightful !!Thank you very much sir Tech Math

[@kianfrawley8364]

This helps so much. I always tended to do it the other way around and overloaded my brain. Now it is just a matter of making this my natural reaction.

[@cool7654321]

This is validating how I created my own mental math in my head as a kid. I felt so confused why we didn't do it this way and thought maybe my way was the wrong way and begrudgingly stuck with the slower method because that was what we were taught... I still do it my way in my head but I always felt like it was a secret... until now... Thank you for validating my young self on how to do math.

[@hrthrhs]

Wow your technique actually is quicker for me. What I normally would do was round to the nearest 10 and add/subract that. So with 72 - 24 i would think 72 - 20 = 52, then minus 4 more. Your technique is better. Thanks heaps. I googled random number generator and just kept adding random numbers memtally. Really helps.

[@LoradLP]

55 - 39 i would have done differently. 55 - 40 = 15 15 + 1 =16 Rounding up numbers with a large last digit and correcting afterwards is faster for me. Operations like 55 - 9 where I have to update multiple digits of the total always take me a bit longer.

[@kozlorog]

>watching a math video to improve your mental calculating skills >43+5 = 50 >2016=1984

[@AlanMartinez-tf3qr]

It's just a typo

[@Tempusverum]

You know something, that's genius

[@jamesonschlentz9524]

huh?????

[@bmtdssbmtdss3097]

kzbin.info/www/bejne/qprWh5iCj6mah7M

[@iflawp5454]

😂😂😂😂😂

[@devaljain1998]

Thanx Man!!! After watching your video I was practising and the sums which took me 1 min-2min are just second away from answer. Thumbs Up Buddy!!!

[@SalmanKhan-jc5yd]

Nice

[@xcalibur0645]

Hey, this is a great tutorial. I just want to ask... what drawing application are you using? It seems to be quite efficient.

[@touko2243]

it's not that i can't add them quickly, it's just that in tests my hands get nervous and sweaty because I feel like i'd be a disgrace. -and also because there are timers-

[@daniellaorji956]

Aww, I feel pity. Call this number so I can train you, you poor thing 1 310-774-0776

[@nooyhooy1965]

And also doubt yourself

[@sharonjuniorchess]

The trick is to have different ways of doing the same sum so you can check your answer. Then even if you make a mistake you will know it and be able to correct it. The important thing is not to worry about speed but to concentrate on getting the right answer. If you do the sum one way then reverse the sequence to check your result. Very often you will discover that these 'other' ways are actually faster & easier to do. But they are not generally taught in schools. You find them in Speed/Mental Maths books.

[@kml8240]

thank you so much! through all these years that has passed, i never believe in myself. so, i started to get things seriously because this year i'll be in grade 10 and yet i don't even know how to add this way.

[@BHARATCHAUHAN-cr9zm]

Thank you very much , helped alot as i used to have a hard time when keeping score for darts and this has helped me so much .now i can keep up and beat friends in the additions and subtractions ,,thanks again,

[@sanfiora6537]

I usually do it like 40+10=50 Then 50 stays in my mind And from there i add to 50 7+3=10 Which is 60 Try it y'all

[@melloncollie1551]

So u add 50 and 10 right?

[@yeqo6439]

@@melloncollie1551 That's the normal way

[@youtubewatcher522]

it worked thanks

[@aklearns13]

Did anyone notice that in the question 43+17 he said add 43 and 7 but he actually wrote 43+5=50

[@MaureenMurphy_]

Yes I noticed that. It made me feel slow as hell

[@enderless6055]

Yeah lmao

[@megbes2193]

I only got this far in the video and now I'm thinking I don't want to finish it. Just checking if anyone else commented on the mistake.

[@sarasalem2331]

Little tricks matter. Thank you for this video!

[@keitharoo1962]

My mind didn't do the math this way...but it does now! Thanks so much for this video!

[@franciscov2431]

For a 2-2 digit numbers, I would do something like this: 89 + 76 > 80+70 = 150; 6+9=15; 150+15=165; for subtraction, e.g. 56 - 27, add 3 to 27, so you have 30, keep in mind your three, now 56-30 = 26, add your three here, 26+3 = 29

[@Unknown-qq5hm]

I'm 23 and still don't know how to add mentally 😅

[@Aju31]

Me to bro

[@ladydia3928]

This method alleviates the intimidation factor math used to pose. Great job!

[@amanderrish5472]

i really learnt from this it thought me a lot and it helped me through my test in school

[@MalyWladziu5]

Question : if you want to calculate let's say 114 + 8, how do you proceed in your head ? a) 114 + 6 = 120 , 120 + 2 = 122 b) 114 + 10 = 124, 124 - 2 = 122 c) another way ?

[@time9496]

Nice

[@kshiteej7575]

What I've found best for myself is to learn the single digit sums like 7+3=10 ; 6+9=15 ; 9+9=18 and so on. so what i'd do is 8+4=12 so last digit is 2 and carry over 1 gets added to middle 1 in 114. so i get 122

[@unique1991-]

wow, i wasn’t getting this at first, but i got it now. just going to practice a lot now. thanks 👍

[@amiraacheh3539]

Thank you so much! These strategies really helped me a lot😄😄

[@kellytorres51]

For (37 + 68) I round up to (40 + 70) which equals 110 and then subtract the the difference from the rounded up numbers to the original set. So, 110-5 = 105

[@ajnjmar1]

Awesome videos! Thanks for making these - they are helping a lot of people! = )

[@purpleleprechaun112]

43+5=50??? omg

[@Armored11]

That's what I was thinking. Lol

[@ayayayaycaramba8581]

+Durgesh Thakur hahahaha

[@alrondestua8486]

just use your common sense

[@manutge3574]

43+5=50 WOT

[@Clearyourmindorg]

Pretty impressive to get the answer right even if he's using the wrong numbers

[@RoxanaP56]

Love this Skill !! Thank you

[@JessicaNaranjo4094]

Thank you so much for this video.

[@meshugunner]

As you say, it doesn't matter whether you go right to left or left to right, but do you think it's a good idea to switch back and forth? Doing it the same way every time eliminates a decision from the process and making your technique more automatic and reliable. Just my opinion. Your videos are excellent.

[@touko2243]

for 43 + 17 i did 7 + 3 = 10 and then 4 + 1 = 5. 510 minus the 1 (Because it makes logical sense that it wouldn't be that big) in the 10 = 50.

[@Robbiecraige]

Good little trick... I did it another way but yours is faster so i'm doing it your way from now on. Thanks

[@SHE77Y1]

Thanks! This video really helps

[@Itisheylel]

Thank you :( I’m good with Math but whenever I feel pressured working as a cashier I calculate wrong.

[@leinad907]

says I would do 43+7 and writes 43+5 this is way I have trust issues

[@randomerVlogs]

The one thing I won't miss about high school. SHOW ALL YOUR WORK.

[@cogaardnerfmods]

I got an A in school for these tricks. Thank you so much!!

[@michellefecteau620]

Omg thank you! I'm a cashier and I know I should be better at adding and subtracting things mentally in my head, but it's always been such a struggle for me. This helped me so much!

[@radealainimariam9991]

u look young

[@vipintyagi7465]

wow 43 +5 =50. great maths.

[@salumtummundi9462]

43+7*** Lmao

[@cartoonline3739]

Thanks so much my metal maths suck but knowing this makes life a lot easier

[@daniellaorji956]

I love any video about maths because, it's my favourite subject. I love challenging myself and maths is my aim. I want to over come that phobia of mathematics A.K.A Mathematiphobia, I won't give up!

[@elvarwinston]

Did you succeed 1 year later?

[@cowboy19750]

1:20 7 or 5 lol its ight I do that sometimes

[@anthonyzenteno9093]

anyone realized in all of his videos he stars with saying "Good eye"?

[@tecmath]

Anthony Zenteno Thanks for the comment! The start is G'day (short for good day). Just the way Australians say hello.

[@anthonyzenteno9093]

ow cool but i still love your vids they help a lot :)

[@fayzullashamsiev7888]

Anthony Zenteno it's not good eye it's good day

[@fayzullashamsiev7888]

Anthony Zenteno it's not good eye it's good day

[@ayayayaycaramba8581]

+tecmath hey 43 + 5 is not equal to 50 lol

[@briarrose7016]

I'm here because I have aphantasia, which has always prevented me from being able to see/imagine numbers in my head in order to add and subtract. I've always had to count on my fingers or write things down and do it long handed. Sadly once I started using a calculator all of my math skills I managed to learn went out the window and now I struggle with even simple addition/subtraction...so here I am! I hope this helps.

[@ihori779]

If to do it 'in the head' it's much easier to deal with 'rounded' numbers than to keep in mind each result for units and decimals and then adding both results together. The 'tricks' from this video suites more for counting with a pen and paper. Better trick is to start imagining numbers in a bit differet way like: 55-39 => (55+1) - 40 43 + 17 => 40 + 20 37 + 68 => 40 + (68-3) or (37-2) + 70

[@Lswisdom77]

his method is a little backwards. it's better to work with tens when adding the one's column, the carried number is always gonna be one. I would not recommend this method. nice voice though

[@jade43296]

I add 7+3 to get rid of any pesky extras to get it all to round 10s; then add 50+10

[@eyefly876]

Thanks watched your entire series. It was really helpful

[@mydogskips2]

Yup, the way they teach us in school, to add from right to left, while perhaps more basic, straightforward, and technically correct from the standpoint of teaching how to do the problem, it could be considered backward, it's generally easier to add from left to right starting with bigger numbers. I mean, just trying to teach my nephew extremely simple adding problems using flashcards, I realized it's much easier to add a small number to a big number rather than a big number to a small number, in fact, it's actually what he did. For example,17 + 5 is much easier than 5 + 17, it's just the way our mind works, at least for most people. When I asked my nephew what is 5 + 17, he would always do 17 + 5. With 37 + 68, I would say 30 and 60 is 90, and 7 and 8 is 15, then 90 + 15 + 105, easy. It's much easier than doing 8 + 7 is 15, so write 5 and carry one, then 3 + 6 equals 9, then add the one we carried over and get 10, and 5, which makes 105.

[@BobBob-ie4iv]

My mind be deceiving me 😭for the 105+77 for some reason I saw 77 as 75 so I was like oh that’s common sense it’s 180 😔i hate my self

[@osuipad2107]

Lol

[@klausstreubelt6288]

Me: hold my beer then I will show you my skills Also me: 2+2 is 4-1 is 3 quick maths

[@shonk7201]

Thank you , it really helped a lot !

[@user-ic5nu3hh2x]

So helpful and so easy to understand THANK YOU

[@camaramackey8525]

you got 50 from adding 43+5 how??? lol

[@carlasoulthomasable]

Camara Mackey exactly my thought

[@SuperTechno2012]

Camara Mackey typo

[@EwigesEis]

magic!

[@estroncio64]

+MrBusta Not a typo because he's not typing, just a misteak

[@john-qk4mc]

Camara Mackey it was magic bro

[@pacify1818]

im in 4th grade and very smart pass every single test A and B

[@Emma-kd8lq]

Excellent me too I'm 10 but I'm in grade 6 lol

[@KrishSharma2112]

No one gives and correct your spelling "smart one"

[@nickjonasbigfan]

+Krish Sharma Rude.

[@rexsongodinho5623]

I'm in 10th And I pass my test with E and F u must be wondering how. Well Money do it.

[@rexsongodinho5623]

U must be smart but m rich.

[@phorgive]

Thank you kind sir. You just improved my 501 Dart game.

[@yousafk6246]

Thanks this really helped me

[@Vadoseharpy3025]

my only problem is my memory. I did solved it but forgot the answers along the way

[@chrsjco]

Practice is the key man

[@eipler22b17]

You said, "43 + 7 = 50". But wrote "43 + 5 = 50." Good one.

[@victorgroves7426]

I’ve always liked math but never even thought of doing it that way. Thanks so much!!!

[@pikazu2578]

Thank you for saying, "keep practicing it 👍🏻"

[@stefanthoompunkal497]

43+5=48?

[@salumtummundi9462]

No 50

[@ElliotCS1.6]

9 + 10 = 21

[@alaamady3344]

+stillmatic TV stooped

[@user-xo3pr2xe6j]

for subtraction i do the units first so for his example its 82-14 I do 2-4 which is -2 (or do 4-2 =2 then add a '-' in front of the 2) then I save the -2 for later, then work out 8-1 which is 7 and then just do 80-2 to get the last digit so the answer is 78

[@Kilogya]

My new favorite method thanks.

[@maximilianharvison9965]

dis guy from first grade?

[@zaczaclivingston]

43+5=48 not 50 lolz

[@JesusPulledMeThrough]

Omgosh, Thank You Sooo Much!!!

[@SnowWhite-dr6xh]

This is the way I do it. I thought I was strange. I find the long method very difficult and conveluted, when I just want to juggle numbers in my head. I don't know why I have such a negative reaction to it, but I'm teaching my daughter now and nothing has changed since I learnt 30 years ago.

[@dalineng]

This video won't help me with my homework, I never get anything. I am a terrible learner

[@sportscarman5]

+Dalin Eng Everyone thinks and learns in different ways. You just have to find the way that works best for you :)

[@tarasdoesdiy1999]

+Dalin Eng If someone was to say something to you and you understood it, without literally saying, "I understand," what would you say? Like, "I get it," etc...

[@kenleylouisjean4918]

43+5=48

[@steelwall1]

What an AWESOME TRICK! Thank!

[@rushikesh094]

It's really good trick. Thank you!

[@hasbanallahu4631]

Fun Fact: Everyone thought that he is gonna ask us some dictations of mental math using abacus, Edit: Not everyone!!