Quick: What's 78,269 x 78,269?

Can you solve this in your head? Building on his sorcery of crunching two-digit squares, the Mathemagician, Arthur Benjamin raises the bar with impossibly large squares.
Watch the Full Program Here: • The Mathemagician
Original Program Date: June 5, 2010
The World Science Festival gathers great minds in science and the arts to produce live and digital content that allows a broad general audience to engage with scientific discoveries. Our mission is to cultivate a general public informed by science, inspired by its wonder, convinced of its value, and prepared to engage with its implications for the future.
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[@tavuweshwesh]

He had me at "Let me recap"

[@catseyemarble330]

tavuweshwesh lemme smaaasshhh

[@classic4624]

Cat's Eye Marble leemmmme smeshh

[@The_Legendary_Nic]

When someone asks me to explain Pokémon.

[@amberyeomans5631]

* brain cells,math teachers,logic, and tooters have left the chat *

[@micahnine4103]

... Handwriting entered the chat. Math entered the chat. Handwriting left the chat.

[@Clynycal3953]

Every number goes to the first power but you don't write that

[@brentangelolambino6272]

Meanwhile, I asked my seatmates 8×7 cuz I was too lazy to solve it myself...

[@macp8113]

Let me show you more simple way... We have 78269 to be squared Lets add 31 we get 78300 and let's subtract 31 we get 78238 Now multiply 78300 and 78238 you get 6,126,035,400 now just add 31 square which 961 Your answer is 6,126,036,361 Maths is simple and it can never get wrong Hope you like it.

[@aclemasultan1794]

That is how i'm trying to do to square a 5 digit number.

[@giannakiskotsinoxorka1011]

Or just do it vertically and it would take you 10 seconds but oh well

[@DrinkYanfoWillFat]

Two plus two is four, minus one thats three quick maths

[@aa-to6ws]

Your older brother trying to teach you algebra.

[@noivern666]

This, except this guy didnt beat the fuck out of anyone

[@felixduckwall5256]

7th grader here trying to explain calculus to my 6th grade sister. Oof she doesn't even understand functions.

[@DylansLappalterCopium]

I feel that, *but* its my teacher

[@f4b860]

Hehe

[@edelweiss-kun4037]

The "Perfect Square Trinomial" trick.

[@satyamwats7846]

*Reads the title* *Answers in head 78,269 squared* *Declares myself as Human Calculator*

[@inakibolivar664]

Wats I doubt it

[@amd_kritbobit2810]

iñaki bolivar no u don’t get it he is saying that he said “78,269 squared” in his head, not the actual answer. It was a joke. He knows that something multiplied by itself means it is being squared.

[@aliyahcastilleja1385]

That is exactly what I said lol

[@pearrzmp4]

rip the joke🤦🏾‍♂️

[@joelcoll4034]

I answered 78²*10^6+2*78*10³*269+269² in my head.

[@paper2222]

"Let me recap..." *literally recaps*

[@aks6730]

He probably calculated the entire answer while having that conversation.

[@kxasrk2035]

AK S lol maybe

[@AmZaDin14]

Yeah, i do think so. He calculated the easy part "for him" first, like 78² and 269²

[@aks6730]

@@AmZaDin14 Exactly. Still pretty amazing!

[@karma6326]

Indeed

[@user-dm7sr8eo5j]

He's more amazing if he do that thinking you solve math while talking thats multi tasking bro. He's way beyond calculator,he's a computer

[@yousof8546]

This is why calculators exist

[@retepthegoat762]

HE IS THE CALCULATOR

[@GeartoxGD]

@@retepthegoat762 lol

[@daviiidruiz]

*_syntax error_*

[@DaBonkinator]

Tbh and im probs gonna come across as an r/iamverysmart douchebag but really I dont like how in a lot of schools people are educated to use calculators therefore they become dependant on them (my friend once asked how much was 2x15 and i jokingly said 200 and she though it was legit the answer, and no, there ARE people that are far worse than her).

[@yousof8546]

Diego Da Bonkinator thats true but im just curious... At which grade did you start using calculators?

[@stevejay5118]

You thought that was impressive, I can find the square root of the answer in a second... 78,269

[@kiattim2100]

Damn

[@yamahaddad2132]

Yeah using a calculator not your brain

[@tracersgta]

Yama Haddad I don't know about him but you're definitely not using your brain if you missed that joke.

[@hollowvoidz3472]

Yama Haddad the joke went way over your head

[@kosta3930]

@@hollowvoidz3472 nothing goes over my head

[@bo6887]

“Six” “Nine” nice

[@jordanjimenez4491]

Nice

[@notyasin5904]

Nice

[@mythicalmilk4686]

You now have 69 likes.

[@notyasin5904]

@@mythicalmilk4686 nnicee

[@Gaciet017]

Nice

[@andyhernandez6136]

Teacher: What is 7×5? Me: Don't worry about it

[@BMcCosmic]

35

[@ajpencilart9421]

Let the answer be x

[@color_hamza2355]

I know it! It's seven times five!

[@jayjayrah7237]

12?

[@BurgoYT]

killer Stein 7 x 5 = x therefore x = 5x7

[@VOTVRe]

When you take LSD and Speed before your maths exam

[@bobhiggins5553]

DSRReacts I wish...

[@careforenvironment224]

The number was a paid actor.

[@Heartless1v9]

LMFAO

[@orlando3761]

It’s true I saw it I was the paper

[@rion7088]

I was the cap and I Must say this guy is a real charlatan.

[@jamsheedplays]

@I forgot my name !! why tf did you agree to him!?

[@LeBassiveOG]

@I forgot my name !! But numbers dont lie

[@saptikghosh7773]

Huh?! What's the big deal... All you had to do was add 78,269 with 78,269 for 78,269 times....😒

[@FranXiT]

@Barbare4032 r/woooosh

[@crossandres7]

@Barbare4032 fucking nugget

[@virgin1792]

You fucking invertebrate.

[@fortnitegiveaways6050]

You fucking vertebrate.

[@paulomachado7328]

@Barbare4032 fucking dolt

[@yms9574]

0:56 see how he said " HAHA " cus of the guy who said 9 after 6 ..lol

[@really_unusual_edits]

HAHAHAHA also 2:10 definitely a method to my madness ... shakes his head definitely definitely :)))))))))))))))))))))))))))))

[@elmiralustiva7593]

Because he can make it a 70.

[@jls.mp4]

@@really_unusual_edits he makes that in every show hes in.

[@adhamhisham978]

Howa enta areeb boudy

[@Unweyrandom-bk4kq]

*stop using cheat codes, man*

[@AzerothKings]

300 subscribers without any videos It’s a FENETIC code, a PNEUMONIC device...

[@ilhamalbasith2618]

@@AzerothKings It's a JOKE, a THING that someone says to cause amusement or laughter...

[@yesyes2750]

AzerothKings YT / GT r/woooosh

[@calamariz10]

@@AzerothKings r/woooosh

[@AzerothKings]

damn i was making fun of the cheat codes :

[@lifelike6423]

And it takes me about 40 seconds and 3 retries in my head to figure out what 8 times 7 is

[@GewelReal]

21

[@ashermack2543]

Gewel ✔ no obviously its thanos` thumb squared divided by mary poppins which equals dat boi

[@effatel-sherif7159]

56

[@lxxwie9407]

Just remember 5,6,7,8 56 = 7×8

when you multiply by 2, you just think the double, and you can take advantage of that, because when multiplying with 4, is double and double again, and with 8, is double, double, double, so do doubles 3 times: 7x2= 14, x2=28, x2 = 56.

[@alexalexandru691]

*Einstein wants to know your location*

[@dergreg_]

wtf dude he's already dead

[@mA-se2yv]

AlphaCreative r/wooooooooosh

[@xokryo]

@@dergreg_ r/woooosh

[@leafninjazyt6173]

m A no u r/woooosh

[@mA-se2yv]

Leafninjaz YT NANI!!!!

[@amcivi2856]

Anyone else feel stupid after randomly getting this in their recommended?

[@jayjayrah7237]

Yeah 😐

[@bitslay]

*Syntax error*

[@alejandroortiz9470]

Lolololol

[@bitslay]

@bill lamook never heard anything called math error. Syntax error is a famous phase which shows up in calculators if the math isn't valid

[@acguy8711]

@@bitslay Our calculators have Math Error in them so idk what you're talking about

[@bitslay]

@@acguy8711 what calculator are u talking about. Never saw any calculator show 'math error'

[@elitegamer1954]

My calculatir have syntax error and math error but mostly its syntax error

[@hamzamahmood9565]

Jesus is always the answer

[@darky799]

You need more jesus

[@whatthehelliseventhat8231]

....Got me rolling ☠

[@3NABL3D]

That's funny as hell, next time I have a quiz ima put Jesus for all of the answer's

[@careforenvironment224]

You replied me once in that dam video

[@russell5058]

You not gonna put "jesus" in your answer sheets

[@WholesomeLad]

I got lost when he said "Ill start the problem in the middle"

[@Magnezium7]

True why start the problem in the middle? That doesn’t sound like a good place to start

[@gaboni1232]

Nice picture

[@Bluesine_R]

If you really want to know (not sure), he uses the fact that (a+b)^2=a^2+2ab+b^2, in this case 78269^2=(78000+269)^2=(78000)^2+ 2(78000)(269)+(269)^2. When he says he’ll start in the middle, he’ll do 78000*269*2 first.

[@hollowvoidz3472]

atmatey ok once I saw all those numbers I instantly quit reading your comment

[@Magnezium7]

atmatey lol when I read your comment all I saw was (abcdefghijklmnopqrstuvwxyz)1234567890

[@bardiiii]

*uses calculator* GOT THE ANSWER

[@youtubervishal6809]

Me: Sees the thumbnail and title, Rushes to the phone's calculator thinking something's special Got the result Returns to the video Founds the exact same answer Nothing's special WHY DOES THIS VIDEO EVEN EXIST?!

[@vectriix1229]

It’s 6126036361

[@adam14mull96]

6,126,036,361

[@xxschattenxx9916]

2+2=4-1 is 3 quick maths

[@ksmith011]

mafs

[@shizukousapostle1stapostle710]

Everyday man's on the block, Smoke Trees

[@timlyxd]

@@shizukousapostle1stapostle710 See your girl in the park, that girl is a uckers When the ting went quack-quack-quack, you man were ducking

[@arjunnath6251]

I love these mathematical memes ❤🤣

[@timlyxd]

@X4TERUMI Gustav Åhr werd geboren op 1 november 1996 in Pennsylvania en groeide op in Long Island, New York.[4] Zijn ouders waren beiden afgestudeerd aan Harvard en scheidden wanneer hij een tiener was. Åhrs moeder was lerares en zijn vader was professor. Åhr zat op de Long Beach High School in Lido Beach, New York, waar hij weinig naartoe ging, maar toch goede cijfers haalde.[5] Hij stopte met zijn middelbare school en volgde online cursussen om toch zijn diploma te halen.[6] Korte tijd later begon hij met het publiceren van zijn muziek op KZbin en SoundCloud. Toen Åhr 17 was verhuisde hij naar Los Angeles om zijn muziekcarrière op te bouwen.[7] Carrière Beginjaren (2015-2017) In 2015 bracht Åhr zijn eerste mixtape, Lil Peep Part One, uit, die in de eerste week 4.000 keer beluisterd werd. Kort daarna kwamen zijn ep Feelz en zijn tweede mixtape Live Forever uit.[8][9] In 2016 bracht Åhr twee mixtapes uit, Crybaby en Hellboy.[10] In mei 2017 beschuldigde de band Mineral Åhr van auteursrechtenschending, omdat hij een sample uit hun nummer "LoveLetterTypewriter" in zijn nummer "Hollywood Dreaming" gebruikt had zonder hiervoor de rechten te verkrijgen. Åhr zei hierop dat hij alleen wat liefde voor het nummer wilde tonen met de sample.[11] Come Over When You're Sober (2017) Op 2 juni 2017 kondigde Åhr zijn debuutalbum, Come Over When You're Sober, aan via Instagram. Het album zou uitkomen op 11 augustus 2017.[12][13] Na een korte vertraging kwam het uiteindelijk uit op 15 augustus 2017.[14] Åhr kondigde een tournee aan met Come Over When You're Sober om het album te promoten. De tour begon op 2 augustus 2017 en zou eindigen op 17 november 2017, maar stopte twee dagen eerder wegens zijn dood.[15]

[@subscriberswithnovideosc-mk3up]

Lmao he started sweating so hard

[@subscriberswithnovideosc-mk3up]

@@AOUXE yup

[@Y0y0Jester]

That high performance processor need some water cooling

[@wooferjr169]

The heat sink on its head wasn't thick enough to cool it down enough...

[@brooksgunn5235]

Probably so hot on that stage.

[@materialism_3267]

Leave my boy alone he prolly has a boner

[@xavierthomas0585]

Eminem has entered the chat Mathematition has entered the chat Eminem has left the chat

[@SMB8037C]

Quick Curve mathemagician

[@mhelmalonzo2040]

*QUICK MAFS*

[@FR0ZENxTUNA]

I was looking for this comment

[@DebzLife]

Ting goes skkkkrrraa

[@mohamedsoussou6187]

0:58 : 6 ... 9 ... hahaaa mathematician goes dirty !

[@footubehd7288]

@@markcelemen q

[@daves.dumanjug7807]

Shit69

[@annoyedspy2173]

Hahaaaa funnyyy NOT

[@onemanwave3762]

Same bro I was gon comment

[@bolson42]

Are you actually 12 years old

[@wenaldy]

Take a shot everytime you find "vedic math from India" in the comment section.

[@DaRoachDoggJr]

wenaldy writing this in hospital from alcohol poisoning

[@dhritimankashyap7889]

😂😂😂

[@RazanAr51]

wenaldy vedic math from india

[@toucanxi178]

I took one reading from this

[@xokryo]

0 times

[@someshagrawal10]

For those who dont understand the trick: He simply just apply the formula a^2 +2ab+b^2

[@bountiful14]

(a+b)^2 😉

[@bountiful14]

Axel DeOcampo mhm

[@alexmarie.7374]

still don’t understand but thanks dude

[@wehaveanannouncementtomake5517]

somesh agrawal I feel accomplished, I understand this and I’m in 6th grade haha

[@bountiful14]

We have an announcement to make Ninja Sucks im in 6th as well 😂

[@Stumbler2001]

So he solved it by breaking it down into smaller calculations which I still cannot do in my head. Helpful.

[@Jo_Es_Chess_Channel]

It needs practice if you want to do it in your head, not anyone can do it

[@LeoNardo-ku2wy]

Well i can give the root of the answer It's 78,269

[@Robin-jg2yf]

Comment copier

[@baggedcoleslaw]

Danial Ahmed LMAO

[@JustJum]

Come on guys, thats simple: 78,268 x 78,269 = 78,269^2

[@GrannyIsAlive]

*Oh no! Too much number in my HEAD!!!*

[@ВладимирДрумев]

@@shoest1210 xdd

[@AquaPJ]

@@shoest1210 XD

[@tehlegend3681]

Great Mems XD

[@usmanh5949]

Great Mems XD

[@adriansodo9895]

@@shoest1210 XD

[@snowy2619]

He sounds like he’s trying to auction something

[@aldozulfikar54]

I could do this in a second 78,269^2

[@damien18462]

Aldo Zulfikar the answer is..... CORRECT *Queue The Who Wants To Be A Millionaire music*

[@amritaparida3992]

EndlessFX There is a simple technique for it which I use as in Indian schools they don't allow Calculators. Lets take a 2 digit number for your better explanation. Let n=15 Mark the one's place is 5 Product of 5 =25 Sum of 5=10 Thus, the number is 225 [ How? well, I can't explain in simply words I have to demonstrate it, But all I can say there is something with product and sum.]

[@nitez2730]

@@amritaparida3992 maybe just having the process going through your mind will help do it faster and more efficiently as opposed to doing that weird ass formula

[@amritaparida3992]

NiteZ Comment This method doesn't need pen and paper to calculate. Anyone can calculate using it in their mind. It is just an insight in calculation that I developed automatically because of the extensive solving of mathematical problems. It just require pen and paper to demonstrate and explain to others.

[@leandoer3522]

@@HjalleKalleGaming Dude that's a power not a square root.

[@vitaliabadal4500]

78,269 square... No Harvard, not today

[@salumtummundi9462]

Ur a copy paster I know

[@thanospower3414]

you call that quick...you should give a bank exam in India and then u will know ..

[@fangservicex2964]

Mohammad Asiqur Rehman this is so true lol. given that i've gone through that exam, it made me laugh

[@dhruvpatel7457]

Gand fat ke hath me aa jayegi

[@nishanthchandrashekar1413]

Super and Indeed, Incredible India

[@ratulbhattacharya5297]

Lol bro

[@rajatsahoo2582]

SBI po ki main set dedo...gand phatjayegi uski...

[@d4rksh4dow4]

What's 78,269 x 78,269? half life 3

[@Wafelwaffel]

+Jeff The Ripper checked it, confirmed.

[@d4rksh4dow4]

Wafelwaffel oohhh yeah

[@CallMeSpinpie]

+Jeff The Ripper 21

[@HowtoDoStuffwithEthan]

too easy

[@mariovanda9504]

..

[@mrv7916]

I bet even calculators are scared they’ll get extinct because of him.

[@aleski6506]

Teacher: explains instructions Nerd: starts talking over teacher Teacher: do you want to explain then? Nerd:

[@ethanmartin1642]

He lost me at you got a Calculator that can handle 10 digits or more you can use it

[@hibana99]

Who else has yet to find a comment from an actual Indian, all I can find are comments about them

[@zaidabusaleem9449]

IKR

[@Godogolden]

If you read this sentence, then you've found a comment from an actual Indian.

[@jo_nm9484]

You undertale lover

[@flavioesparza6728]

Godogolden where?

[@Godogolden]

@@flavioesparza6728 I am an Indian 😂 😂

[@wrench2362]

HE SAID THE EXACT SAME THING FOR HIS TED TALK! XD

[@christopherwinston317]

Nathan Tecson exactly what i was thinking! i thought im the only one who noticed lol

[@8AnnaGaming]

Nathan Tecson they cut this part form the original video of Tedx and posted it on their channel

[@anthonydoeseverything4659]

Nathan Tecson yes

[@JorgetePanete]

@@christopherwinston317 I'm*

[@JorgetePanete]

@@8AnnaGaming from*

[@Cuddlzzz1738]

Me: I'm done with my work Math teacher: did u show your work Me: shoots up school

[@retrohotdog3309]

XD

[@akshaydhavala6263]

😂😂😂😂

[@mirillis6083]

Oh mine next plz

[@techknewz]

Fam went from machete to a 6 billion number. Dude is mad af

[@keyboardsmasher7841]

Teacher: What's 78269 × 78269? Me: uuuuuhhhh....... 24?

[@mixxed_nuts]

You know what's funnier than 24? 25

[@logan6267]

No no no! The answer is obviously C. What are you talking about🤣

[@itstilldoodbro9150]

@@logan6267 nooo, it's South Africa

[@amberyeomans5631]

@@itstilldoodbro9150 I got George Washington

[@santsa9042]

21*

[@Neueregel]

i need about the same time (100"). 78^2=6|084 (memory retrieval) and carry it, then 78x269x2=78x538=39K+78x38=39K+3200-240+4=41|964, regroup with above as 6|125|964, carry again, 269^2=270^2-540+1=72.9 K (memory retrieval) -540+1=72|361 final regroup 6|126|036|361. Yet, with pen/paper cross-product and writing result by right to left, it's much easier than recital, about 3-4 times faster

[@haja441]

Sir, what RAM size do you have?

[@pantelispanagiotopoulos2954]

r/iamverysmart

[@leonardomassalairamos6886]

(70000×70000+70000×8000+70000×200+70000×60+70000×9) + (8000×70000+8000×8000+8000×200+8000×60+8000×9) + (200×70000+200×8000+200×200+200×60+200×9) + (60×70000+60×8000+60×200+60×60+60×9) + (9×70000+9×8000+9×200+9×60+9×9) = 6,126,036,361

[@BigDickJoe-cr5dt]

ok

[@insidiosity]

Perfect r/iamverysmart material

[@nongshimbowlnoodle]

SOLD!

[@abaxtiyorov4764]

3:23 here , he was faster than Eminem

[@hemantnanha9891]

4:30

[@NathanArundel]

Like 9 or something

[@DECimotA]

Nah, it’s definitely 9.1

[@FranXiT]

Nah, it's more like 420

[@bigmacbob5833]

Gave you 69

[@gardenofwords914]

Get this man an award for teaching maths in an interesting way

[@huh6344]

This dude got a calculator inside his brain

[@timmyreimers6115]

Kids who never have paper out and say they do the math in their head 😂

[@larryjohnson6793]

Every math assignment I have had in 6 grade mostly I just did in my head

[@kingnative]

The new Steven universe Age of consent 👇🏽

[@lol4funyoutube880]

He makes me feel so uncomfortable..

[@squizzle7210]

This dude has a graphics card built in his brain

[@NorthernlionLP]

Oh my, the amount of r/iamverysmart Indians in the comment section. I'm embarrassed.

[@olympias1528]

Aakash Phadtare ikr, I feel like they just don’t understand how douchy they sound

[@V-for-Vendetta01]

I didn't see a single one lmao

[@NXeta]

*Let me RECAP*

[@mariarose6667]

he has a technique on how to remember the numbers which is probably the most important so you don't lose where your up to. each number 1-9 has a certain sound to it like V=8, CH=6, M=3, T=1 and so on. So if you wanted to remember 36 you'd use M + CH , but to make that easier make it into an actual word like MuCH or MunCH. When he says 'right picher' I think he means R=4, i, G=7, h, T=1 P=9, i, CH=6, e, R=4 (471,964) ... I think...i could be wrong

[@JeffTheHokie]

It's called the major system. There are plenty of resources explaining it. the number is 41964, not 471964. You don't HEAR the g in the word "right" you only hear the r and the t. Go by sound, NOT spelling.

[@aclemasultan1794]

When he says right pitcher what i think he means is that R=4 T=1 P=9 CH=6 R=4 which is 41,964

[@subscriberswithnovideosc-mk3up]

Well i dont know about that number, but i know how much 69x69 is

[@alexwarwick1030]

69696 subscribers with no videos challenge same in year 7 i learnt 69 squared, cubed, to the four and to the five. and the square root of 69, and and the square root of 69.69. i’m sad i know

[@god_cells8035]

@@alexwarwick1030 you make me sad too:)

[@itsyaboidaboi2545]

God_ Cells what?

[@denn1710]

69696 subscribers with no videos challenge I did that on my calculator during social studies today in my school

[@vortexofsoulz]

What? An orgy.

[@sparkyceet7213]

Pitcher to catcher to machete= To machete kills.

[@sherlockholmeslives.1605]

My limit is multiplying two 2-digit numbers in my head! Arthur Benjamin is exceptional! As is the German savant Rudolph Gamm, the English savant Daniel Tennant and Scott Flansberg.

[@AkashDubey1706]

U dont know shakunthala devi??? The woman who beat computer!

[@thesavantart8480]

Mike Fuller Rudiger Gamm was not a savant. He was tested for it and the results were negative.

[@kantisingh2664]

He had just use the formula a2+ 2ab+b2

[@domotaviani6330]

4 billion times caprisun plus the square root of Joe namath divided by bill Clinton's foot= answer

[@sujatahota6147]

Omg xD im dying

[@midas8877]

Answer lemon duck pants

[@harut4788]

HAHAHAGAHA i live for comments like that!

[@NFG-Nero]

I swear god if there will be math teachers like this guy..

[@harshpandey6725]

Eminem - Professional rapper Sir Arthur - hold my calculation speed👍👍👍

[@bengodamango5343]

What’s the dedicated wam to a math problem?

[@noah321]

free shavo cadoo

[@vynzsedotes3863]

*dedtotated

[@harryballs9508]

Stooooop! You made me laugh so much I could have dropped my CROISSANT!

[@raihanaviation]

This is not a human

[@quapin]

For the last 2 numbers nice.

[@shivylol6409]

Right fisher? Did my man go fishing?

[@afiq7654]

Skripe?

[@divyoroy9056]

@@wetfart420 I started dying after I heard right Fisher into his calculation

[@erlingnesbakken9871]

*pitcher No one’s fishing

[@aclemasultan1794]

@@wetfart420It's phenetic code.

[@nosoyporta]

2+2 is 4-1 is 3 quick maths

[@jmomo_]

I can multiply that faster than him... I'm 12 I'm Asian

[@andreibors7930]

Roses are red Violets are blue I know the drill And you, my dude, too.

[@sophisticatedfrog5737]

Legend has it that when calculator struggles to answer he asks for help from this guy

[@Patryk_Nowak]

This reminds me of a Apple Event

[@satyaveeryadav8969]

I am satyaveer yadav from India.....brilliant method find of square .......I love you sir and thank you so much sir

[@thequebee_0101]

I have your book. I can calculate 2 digit squares in less than 12 seconds. Thanks:))))

[@hasnatahmad6164]

2 digits is more than easy U dont need book for this😁😁😁😁

[@Htiy]

Kaustubh Prakash you could just memorize it, its 89 numbers, shorter to memorize than a 12x12 times table, but nice!

[@Super-wx6br]

97

[@leonsm3810]

Can pikachu defeat doraemon?

[@kuttemkidd4899]

Nope

[@emotionaljackfruit]

Maybe. such a valid and related question though

[@leonsm3810]

@@emotionaljackfruit uh huh...

[@ed1_mc]

*God wants to know your location.*

[@slamanalotaiby3377]

And me here using the calculator to make sure that 3+6 is 9 in my math exam

[@natnsnns]

*calculator has joined the chat*

[@jacklichtman1214]

Who’s watching this in 2019?

[@youdontwannabehighlikeme4305]

2020 is bad go back to 2019

[@jacklichtman1214]

Samia Ndouaarab bro...

[@holak1652]

He sounds like this guy from magazine wars

[@a.k.6429]

_Relax guys,this man obviously is a paid actor,he learned what the solution is by heart.._

[@gocommitdeathpacito]

Hey brother

[@synerlxrd7892]

ME: *Reading the Title* and read the word quick. Video is 5 min long

[@PeterGriffin-rb7tp]

The answer is 6,126,036,361. I looked at the thumbnail and answered it on the calculator before watching the actual video.

[@connorhenderson2943]

Walking lunch money

[@g.valcic3137]

I can't stop laughing

[@saunokchakrabarty8384]

Wtf? The video ended before his explanation? What's the point of that?

[@maylsy8130]

The original video is in teds talk i guess. Or the other version

[@nxvehard9611]

Who opened the calculator before watching the video to see the correct answer ?

[@peterpotter468]

It's not that you'd ever multiply 78,269 chocolate bars by 78,269 chocolate bars ever in your life.

[@kwilson5832]

I'm obviously impressed that he can work the answer out in his head. However, I'm even more impressed with how at 3:47 he says 41,864, but then tells himself that it 'seems wrong'. How does he realise it's wrong?

[@fracarolli]

Preamble: he was trying to calculate 78 times 269, right? So, he noticed that 269 is 270 minus 1, so he first did 78 times 270 and broke 270 down into 9 times 3 times 10. 78 times 9 is 702, which is a trivial calculation to him. 702 times 3 is 2106 and 2106 times 10 is 21060, which is the result of 78 times 270. But he wanted 78 times 269, right? So he had to subtract 78 from his answer. 21060 - 78 = 21060 - 60 - 18 = 21000 - 18. By that point, he used the fact that the thousands "complement" of 18 is 982, by which I mean that 972 is the number you add to 18 to get 1000. He finally arrived at the result of 78 x 269, which is 20,982. Now, the de facto answer: since he needed twice the value of 78 x 269, he came to the realization that his calculation was wrong because he noticed that he should have a carry at some point, but it didn't happen. He saw that doubling 20,900-something would arrive at 41 thousand and that 82 should also carry a 1 in the process of doubling. So, he arrived at 20,982 x 2 = 41,864, which is wrong. He probably noticed that he was supposed to carry the 1 twice, but only did it once and, under pressure, could not figure out where the second carry was supposed to happen, so he started over.

[@NarutoUzumaki-ko2te]

Man solving this math problem like it was suppose to be a magic trick 😂

[@HowtoDoStuffwithEthan]

he used the same words from his ted talk!!!!!

[@HowtoDoStuffwithEthan]

well, kind of.

[@Steve-uf5yf]

Yup because he can calculate while talking the same speech subconsciously without thinking about it.

[@dankeboi]

Just calculate this.

[@sugitataiki8601]

This guy is so good at math he can turn your wife into an x