Arthur Benjamin - Secrets of Mental Math

Arthur Benjamin, Professor of Mathematics at Harvey Mudd College, explains the fundamentals of performing mental mathematics. This video was produced for Mathematics Awareness Month, 2014. Visit www.mathaware.org for more.

[@Pilgrim182]

His passion is contagious. Learn something from everything and learn EVERYTHING from SOMETHING; then tell that something to the world with all the passion you can.

[@sixtallballer]

They should teach this in schools

[@jakeabusaid1184]

I agree

[@avirambhalla-levine1854]

+Sixtall baller There is a logical reason to not teach this in schools, at least until students learn Algebra I as knowing the method without its justification may end up being detrimental in the future as innovation depends on seeing and using the justification, not just the method.

[@meowjan3447]

yes, they only teach us to accept and use tech

[@adamnguyen1808]

If you want to learn this and use this actively you can either study by yourself or ask your schools math team coach, you should learn a new trick to actively use every week(Depending on the frequency of the meets)

[@smorrow]

If they taught it in schools no-one would learn it.

[@shou7310]

No but seriously as I never say this to someone, this man is not only intelligent but very likeable. I watched many of his videos and he seems like a real nice man.

[@thefruitofpassion927]

This guy is like the Bob Ross for the math world. He's awesome!

[@curiouscollectiblesAU]

He'd make Ross really proud.

[@noahcoats7543]

Math is an art, and I think this guy definitely "Beat the devil" out of Bob.... (Note Bob said in like, every video when cleaning your brush to "beat the devil out of it.)

[@RalphTyrant]

"i wont let this stop me" Jesus he has gone mad with MATH lol love this guy!

[@koreboredom4302]

I feel like a genius now.

[@FirstnameLastname-dm2xl]

If maths was taught with this most basic logic instead of some complicated interpretation then you'd see more people liking maths and be good at it.

[@casey-gt8nl]

not really. this isn’t logic and doesn’t work for most math principles.

[@intergalacticraisins8985]

@@casey-gt8nl It isn't meant to work for most math principles. It's only intended for squaring and what makes it illogical? It is a reliable method for squaring.

[@eldiegoasecas]

@@intergalacticraisins8985 but it is not that logical, it's just mnemotechnics. where's the logic if you can't follow the same procedure for any number?

[@eldiegoasecas]

@@intergalacticraisins8985 also not that really practical at all. have you seen the mess that 98^2 got into? tell me that's easier than multiplying 98*98 or if you want it 100^2 - 98*2

[@intergalacticraisins8985]

@@eldiegoasecas what numbers doesn't it work for? 98^2 is just 96*100 which is 9600 plus 4 so 9604. You wouldn't need to use this for 100^2 because obviously it's just 10000. Just because there is a faster method in some situations doesn't mean it's illogical.

[@nikp6302]

Why can't he be my math teacher??? 😩

[@dero4819]

OHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH

[@azmulparvez1790]

Nik P lol

[@hzh628]

Go to harvey mudd colledge !

[@yaradahmed1919]

yes

[@preetioswal6652]

Same

[@Ayy_Doll_Fiddler]

If only there's more teachers like him, everyone would appreciate maths more.

[@looperlpera2165]

This really made me happy. I'm tearing up now. I have always been bad at mental math and people would make fun of me. Just his whole energy and making me learn step by step is such a nice feeling.

[@allendowe6339]

Tedx brought me here..

[@taylorjohn9370]

Allen Dowe me too

[@sherjunggurung6030]

Ted x doesn't transfer dough

[@dominicstowers7767]

Same here, 2 years later

[@protivatasmia1606]

Me too 😅

[@vinodkori8325]

Allen Dowe me too

[@filipeernesto9185]

I’ve self deducted this exact squaring formula at school when i was 15 once, cant believe he did just the same!!

[@mir.9805]

I'm slightly dyslexic and the way this man explains things is beautifuly simple and easy to understand.

[@605gbird]

This guy is so awesome! Love his energy and enthusiasm

[@tarunkumar939]

Thank you Sir. Amazing . Sir, yours videos helping me to teaching in schools. It helping 100s of poor children in learning maths easily.. Yours service is unforgettable... Thank you

[@yehansadissanayake915]

Thank you so much for sharing your knowledge with everyone! You are an amazing guy!

[@chrisp4138]

anyone interested in this should buy his book 'The secrets of mental math'

[@daveortega1689]

wats his book called

[@rockocasso189]

Dave Ortega Just by your comment i think his book wouldn’t even help you

[@daveortega1689]

Rocko Casso jajaja your wright, math is difficult i see my mistake

[@allansherin9565]

@@daveortega1689 What rocko meant is that Chris even wrote the book name and your asking the name of the book.

[@aakash8923]

PDF are free available on google

[@jonahfox1503]

This is absolutely incredible

[@princesscharlen8389]

U are the best math teacher 👨‍🏫 I have ever seen. Solving math with u is so much fun and lively . More grace sir .

[@kwilson5832]

I've watched several of Arthur Benjamin's videos on youtube and I find them fascinating. In another one, he says that he starts saying the answer to a problem before he has worked out the whole answer (an advantage of working left to right). At 9:20, when he says "19 Million", he doesn't know what the rest of the answer is, but he knows it's 19 Million and something, so just says "19 Million" so that he can get it out of his head while he works on the rest of the answer. I find it even more fascinating that he says that by the time he gets to the end of his answer, he sometimes can't remember what the beginning of it was. I can really see that in his answer to the last problem. I wouldn't be surprised if he forgot the answer started with 19 million by the time he had verbalised the whole answer. He is an amazing entertainer and teacher!

[@nattawattangthanakitroj120]

Thank you so much for sharing this video.

[@user-kp7fv2wo9m]

I just read his book on secrets of mental math and it’s really fun to see him explain everything in his book

[@Spider_7_7]

That was very impressive, Professor Benjamin. :)

[@tim1878]

This is wonderful. I have the audio versions of "The Joy of Numbers" and "The Joy of Math," as well as "Mathemagics," but having this audio-visual format is a great advantage.

[@yobhetsocon9206]

Thank you for this. Really help me a lot. Thank you.

[@Macmerck12]

Amazing job sir! I wish math was taught to me like this in HS. Keep putting out more videos

[@MRSDR100]

This made me so happy!

[@kanishmaray]

You're the coolest person I came across, Professor Benjamin.

[@y_p7]

Very very very AWESOME, This guy is Insane !!!! Oh my god

[@RomeoBaulaJr.]

I LOVE YOU PROFESSOR ARTHUR BENJAMIN

[@abelp40]

That's dope. I got a PreCal test this week, this vid should help me speed through it.

[@charlieevans109]

This man has made me happy.

[@underthetreekidtv8161]

short. of words.I can't believe ,I m catching up so good.

[@ggstein]

I would have saved soo much time if I had watched this video a couple years ago. Tks for posting it.

[@hemungkapoor1368]

It's wonderful, thankyou so much sir, keep making more videos.

[@MrChris76ize]

This is so useful ! Thank you so much ! And Im much impressed...

[@davidburrowsyt]

Absolutely fantastic!

[@TheJoshtheboss]

Absolutely amazing!!

[@smellis2564]

Watched this guys ted talks and this video taught me alot I'm trash at maths and this guy is a inspiration to make maths fun

[@sonnyjohnson100]

Excellent video!

[@SamanthaCoolBeans]

this has just blown my mind....

[@novianstringer6580]

this really worked and i will use it for the rest of my days since i am 76

[@RapidScience]

this guy is so cool! He is so smart I love his tricks

[@cMaslow]

Very well explained.

[@hareeshprasana1197]

really i start loving maths

[@skylordquasar]

Most educational nine minutes in quite some time.

[@parikshitsidpara2853]

wow loved this video...thanks to benjamin

[@zachary4137]

this is helping me so much!!!! thank you 🙏

[@EDU4ALL09]

u seem to know a lot, share your knowledge by making a lot of videos !!! Thanks sir

[@vivekjain2261]

excellent!!! You are great benjamin!!

[@user-gd2kj5um9r]

This is amazing !!!😍

[@officialabs9019]

it is a very nice and amazing technique i love it

[@Bootsii]

I just love him so much!!!

[@tsiryolivarajaonarisoa9932]

Thank you sir.

[@kartiksharma7370]

Loved this

[@jessebadger4405]

Blows my Mind

[@vuongquoc1981]

very cool method of squaring random 2 digit number using formula: A^2 = A^2 - d^2 + d^2 = (A + d)(A - d) + d^2

[@diegoflores6164]

Ive known this theorems all the time, but in school never been taught nor discovered by myself this.

[@eldiegoasecas]

it's much easier to multiply the two damn numbers ffs

[@PranamyaPradeep]

@@eldiegoasecas not in your head, this makes it simpler

[@julietfoote6687]

Every time he drew a smiley face in the 0s I had to pause the video because I was laughing. It was just so unexpected at first. But thinking about it, it's actually a pretty good way to teach someone to multiply numbers with a bunch of zeros on the end because then you don't forget them even if you aren't using them in the initial calculation. And it's awesome.

[@zidiqabdallah9666]

Amazing thank you

[@rafaelsales3954]

AWESOME, I’ll learn it!

[@tehhaldiniho]

literally, this should be in the curriculum, thanks (:))

[@carlosmartinezsuarez3541]

I love this man

[@popperpund2353]

thanks, good job

[@ziggytheking]

I love your mathematics plan to use it with grand kids !

[@MrCrunchyLolipop]

Love this guy

[@Golden-xe4il]

i need this for school

[@pragatimhaiskar3047]

you are awwossome. ......... hats off to you.........

[@alecvan7143]

Fascinating!

[@bestmovieclips4k288]

It is very useful. Thank you sir

[@charlessirstutorials932]

An amazing way to handle such an amazing subject by such an amazing teacher. Hats off. #Charlessir'stutorials

[@peternaing2501]

Arthur Benjamin, Professor of Mathematics at Harvey Mudd College, explains the fundamentals of performing mental mathematics. This video was produced for Mathematics Awareness Month, 2014. Visit www.mathaware.org for more.

[@rahulthakur-vx4ll]

such an amiable genius

[@user-jj3mo1ps5f]

It,s wonderful.

[@amitseth2891]

you are great sir, i have mug up squares 1 to 100 by different method but your method is just too easy. Thanks

[@PeterKemp]

Wish I had this information as school

[@Deepak-pi9xx]

thank you very much. it's making me better in maths 😊

[@y.bo.m5963]

What

[@Blakuscus]

This guy just came to my school🙏🏻

[@MichaelShulski]

His enthusiasm is infectious. I had a math teacher similar to him. She was big on hard work though. A lot of students didn't like her. Somethings are no pain no gain. Maybe he could have made it easier.

[@pranprotim3932]

Thanks sir.

[@halafaris3467]

Thanks really helpful

[@Unanswerble_]

Okay this what my 4th class student can teach you!! Even every number's square I will be happy if you do same for cube and so on.

[@keniangervo8417]

Thanks! Rüdiger Gamm should make some tutorial videos about his methods (he's top1 mental calculator in the world atm)

[@theadventuresofjandl2981]

I love you arthur benjamin

[@toshifchhipa8938]

REALLY AWESOME

[@richardfredlund8846]

to find the year code start by dividing the year by 4 to the nearest whole number. For example if the year is 43 dividing by 4 we get 10. Now 10+43 = 53 and 49 is a multiple of 7 so we are left with 4. If it's 2043 then we are done and the year code is 4. If it is 1943 we need to add 1, so the code is 5. This gives the year codes 1900-2099

[@jbenn88]

Awesome stuff! The hardest part of understanding this video was trying to figure out what was "off". Something was getting to me. Then I noticed he missed a belt loop on the back of his pants. I hate those pants with two loops in the middle of the back.

[@princesscharlen8389]

HOW I wish u were my math teacher from when I started school

[@shohruhrozikov8974]

very useful video i like this teacher

[@AnshuKumar-bl1xr]

Amazing..

[@Adrian-wt2yk]

love arthur benjamin

[@fischi3129]

Thank you

[@225sonu]

squaring the no. in last step of which is add and less the no. for making eaiser as Multiple of 0 in end.

[@mmamoloimahlaela4340]

Amazing, I love this :)

[@tinkerscraft1154]

wow...amazing!

[@davismcdonald7064]

Think of what we could accomplish if we taught this to really young children. This guy does it so well I'd bet really young kids could understand.

[@minunelson8341]

Wow my favorite mathemagician

[@in-ep7qv]

Thanks sir

[@Richard_jordan]

He made me love math😀

[@doodlecrayon222]

Thank you. Do you know of any shortcuts for combinatorics?

[@curiouscollectiblesAU]

This guy reminds me of the young lad from That's My Boy. I can hear him answering the arithmetical questions from his admiring fans and saying "bih-boo-bih" **in a robot's voice** "the answer is [answer]"