Do the Math

[tofucyborg]

anybody who knows how to multiply can figure out why this works within a few minutes (or shorter for the smarter ones)

[InaneRex]

O.K.

Looks like non-euclidean geometry..

But, looks certainly are deceiving.

It's a hell of alot faster if you learn techniques in your head.

[pyVlad]

@InaneRex Looks like.. what? This has nothing to do with geometry. This is a visual representation of multiplying 20*10, adding that to 20*3 + 10*1, and then adding that to 3*1. Distributive property, plain and simple.

[marcogi]

hummm,,,i,ve tried 41x16 and it didnt go right!

[angiel18]

@marcogi It goes right...

4 | 25 | 6

= 656

[verszou]

For those interested in some techniques that he actually DID use, check out "Surely you're joking Mr. Feynman" which has several chapters where he explains some seldom taught techniques that he used on things way more complicated than multiplication.

There's also a very funny chapter on how he managed to beat a man with an abacus at doing both addition, multiplication and cube roots - now why would a man who could do that in his head need anything like this :-)

[unchaii]

It's awesome.

[chazza4]

This has zero relevance to Feynman diagrams, except for the fact that it involves straight lines being drawn on paper. As for QFT, I wish it were this straight-forward. Save yourselves the paper and learn to do it in your head, or alternatively, invest in a calculator.

[kurpochelo]

Now try 789 x 987.

[jafoosy]

Ok why do Americans call it 'Math'

it should be 'Maths' stupid country.

[cc3814]

This is not Feynman's work, this is some new wave mumbo jumob called Vedic Math

=\ Nothing Feynman would have wasted time on.

[Awhiffofsuspicion]

ah thats just wonderful

[Marysiaaa22]

Wow... he's so inteligent! It's good theory... I must try it on math lessons.

[bassmanjr14]

what are the restrictions to this technique? i just tried it with some random 2 and 3 digit numbers and it didn't work at all

[postscriptus]

These are not Feynman diagrams, this is 'Vedic mathematics', not all that useful, but nice to transform multiplication into a diagram, this method fails for larger digits

[OOOmoepOOO]

"those" are not feynman diagrams :D

[OriginalCoreaEmo]

this solves quantum field theory equations? um...

[hawtdayim]

great!

[Psued0Name]

This is not by Feynman.

It has been posted on You Tube as Mayan Mathematics

[gastro62]

The more we examine mathematical models, the better our understanding of the reality behind the symbols. This is beautiful in its revealing simplicity.

[lopezsergio01]

its prize not price lol

[AlethiometerBrisingr]

how do you do 22 * 123

[nybble]

Treat the problem as 022 * 123 . . . Draw a dotted line for 0 and where you have an intersection point, just don't count them. You get 0 - 2 - 6 - 10 - 6 for each group - The 10 carries over and give you the answer 2706

[izzaaarocks]

maths <33

[356Spunky]

To those that say, "Just use a calculator" and "this is old math." That's the difference right there. Feynman and most old school engineers, mathematicians and physicists knew that numbers were only symbols/representations. They are concepts that actually represent things in the world based upon a system of thought....something that's lost on most modern students who only know how to use calculators. Most people don't understand the concepts behind the numbers.

[pindanot]

if that's the problem with most students, I've got a gut feeling you can find the cause of it amongst most teachers

[xXxDragunov14xXx]

What kind of loser would waste his life with math. Fucking idiots.

[piddleton]

Where would you be without those losers - in other words, where would you be without your mobile phone, your ipod, your car, etc.

[lopezsergio01]

true true i always hated math its a bunch of bullshit ........when i mean bullshit i mean the advance math basic math is the thing a person really needs

[coolman9999uk]

Then I'd get off the computer if was you, because it's built with bullshit (aka advanced math). I'd also not use your phone because your phone, and the satellites it uses, and how they are kept in in orbit all rely on bullshit too.

In fact, I'd go and live with the Amish if I was you, because most modern technology built using scientific knowledge has only been possible with our understanding of advanced math... sorry i mean bullshit.

[lopezsergio01]

lol!!!!!!!!...no but really its bullshit..not everyone grows up to be a technician, or invents something useful thats the reason i just say advance math is bullshit..a normal person just needs normal math..thats why we got other people that waste their time but still invent something useful for everyday life..thanks to Einstein we have many theorems and he also helped us create other useful stuff in this world so please don't think I'm that stupid...jerk

[iAlta]

There are, in fact, many problems, in the life of a normal modern person, that can be solved by bullshit. But if you do not understand bullshit, you will never know that it can be solved quite simply with bullshit.

 Everything from lottery to understanding a complicating sentence.

[Bayners123]

@xXxDragunov14xXx Do not mock what you can never understand

[freezazoid]

it's seems to take just as much time the standard way...

[jamespfp]

Negative. This is like a graphical abacus. You'd get much faster at this, and it would be easier to imagine it in your head than using number counters because it graphs relations quickly. WOW.

[vagitoe]

I can do the same thing with this magical device called a "calculator"

[AlethiometerBrisingr]

haha

[WhoWorksInSilence]

Bullshit. This method was known in the ancient Vedic scriptures and used by the Sumerians and Egyptians.

[westensunrise]

ab*cd=(10a+b)(10c+d)=100ac+bc+­10(ad+bc)

a good idea for small numbers's calculating

What if it is 75*66? that would be complex!

[SaburoOkita]

Feynman received Nobel PriCe for Feynman's diagram !? What about the joint recipients ? Shinichiro Tomonaga and Julian Schwinger ?

This is Feynman diagrams ? What about the time-space and energy exchange between the electrons ?

This is QED ??!? I thought this is normal Vedic math.

[iljbda4e]

use a calculator, its faster

[H2O0O2H]

This is not tricks. The principle based on what is complex.

If you see the final picture without the numbers, you know what?

[isreasontaboo]

Fantastic.

[MarijnStevens]

Nice trick. But you better just learn math.

[Darvinisti]

What is the point with this? Takes more time to draw the lines then do it all in your head.

[kkkaji]

感動した

[abbesieyes]

Actually this technique is used in Vedic Maths (India) and treats multiplication for what it is....the intersection of vertices in space.

And both WriteSideways and nojameson are correct on salient points.

[pyVlad]

@abbesieyes How is that what multiplication "is"? I could just as easily say that this is simply a visual representation of the distributive property. And that multiplication is repeated addition, which is probably the most accurate definition there is.

[TheBestAboveTheRest]

thats awesome, i actually thought about it and it kind of makes sense why that works

[RonnieIDH]

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA­AAAAAAAA

nice tip!

[nojameson]

This has nothing to do with quantum field theory or Feynman Diagrams!

[waspull]

I like the video, but the description really annoys me.

[DrWinstonRelthford]

@nojameson I disagree.

[mushk45]

hint: do a 5x5

[kuha5ster]

y...whts the difference when i do 5 x 5? ill get 25..

[fiendin281]

how do you know where to draw the curve?

[rockmyfreakingsocks]

ooo it actually works damn i wish i had seen this video before i took my maths non-calculator GCSE ...!!!

[EdgeStormcrow]

and oh my it works.. ill check if it works backwards for division

[EdgeStormcrow]

never seen this before..

very interesting im trying it now.

[ToRiHale]

Nice video but i must say it is quite complex for the younger generation (namely me) though if i do come across a question that i cannot find an appropriate answer for i shall experiment using your method (if I remember how) and we'll see if it works then! :)

[OxnerdKi]

this is cool and all but, like the people below already said, this is not a feynman diagram

[shizzynizzy17]

that's not a Feynman Diagram at all. Feynman diagrams are when u draw two colliding particles at the angles of incidence and show the energy waves and or particles that are emitted and their trajectories after the collision.

[Leumas13]

Feynman diagrams are visual depictions of interactions between particles, in QED these are most commonly electrons and photons, but have been applied to others as well. I have no clue what he's doing with these lines, maybe they were some bi-product, but they are not by any means Feynman diagrams

[snylekkie]

OMG stupid americans

I can do those math faster than I could draw all those lines. How?

25*37 = (20+5)(30+7) = 140+150+600+35=925

OMGOMGOMG I pity you. Go and do the homework instead of sitting here.

[ewanfowler]

This wasn't developed to solve these multiplications, but it is a fun way to work them out.

[snylekkie]

Truly and excruciatingly fun. Not.

[seneca67]

Snylekkie, your demostration of the distributive property to perform multiplication is well known in the USA, and used. However Your insult toward America, however only reduced you from educated status to that of a fish and chips vender.

[snylekkie]

Vendor.

Splendid, sir. I'm happy that it is well known in the USA. I was taught that at age 10. What's wrong with humanity ffs? Maybe make a video about adding 2+2 faster? Now that would be fkin awesome.

[seneca67]

Well, there is a controversy going on in my country about how to teach math. One school of thought is advocating the abandonment of math as you and I were taught, and to move towards a new method, such as the geometric trick we saw above. As a novelty, it holds some charm, but I would still insist that the students learn real math. Imagine that demo done with 987* 98. Tedious

[snylekkie]

Quite the contrary... I was taught the hard way, through repetition and discipline... Cause in the end, this was the fastest method of doing it mentally. Don't get me wrong. If this movie was about calculatin 3^12 really fast I would be happy. Sometimes there are no easy ways...

[seneca67]

Contrary to what? I was taught by discipline, and was expected to memorize as well.

[snylekkie]

Woops. Got the "One school of thought is advocating the abandonment of math as you and I were taught" as "One school of thought is advocating the abandonment of math, as you and I were taught"

Sorry. :)

[john73319]

Seneca, You insult the fish and chip vendors as they do contribute in a positive manner to society.

[WriteSideways]

Coming up with a different approach to solving a problem, regardless of whether or not it's more efficient than other methods, isn't a sign of stupidity. I think it's better to look at problems from different angles to see what's going on instead of learning some single method and leaving it at that. It shows creativity and intelligence and, hell, you might actually end up creating something useful.

[MajorUtah]

Hoorah to that

[BrutalMentality]

talk about an epiphany so magical...mathematics is always amazing

[Outlawpoete]

and when we have a zero?

Et quand on as un zéro?

402*365?

[xPR3CiSiONx]

Insane in the membrane.

[eyz73]

good cool!!!!

[djm2131]

This has absolutely nothing to do with Feynman diagrams. Quantum Field Theory is just a bit more complicated than multiplying three digit numbers.

[47112324]

If only they knew...

[thefattestraiderfan]

correct

[jolesen89]

Now that was nice... and usefull!

[hozer2skate]

This is a real G method...lol

Its cool that there are many ways in which u can solve a math problem...

Does it work with a Zero?

[mzkrizzy]

Nope

[RoyTheHammer]

YEP! Just draw a loop to represent the zero on the graphic layout. This will act as a place holder to keep everything in alignment. Then just don't count any intersections inside the loop. Here's an image of how this works. (Delete the spaces in the URL and paste into your browser) ht tp: //pic20.picturetrail.c om/VOL66/86790/6669793/3044787­55.jpg

[RoyTheHammer]

That comment was in response to the "Does it work with a Zero?" question by hozer2skate.

[sheazi1245]

wtf bbq

[klatrepus]

Just tried to do this with 987*789 and halfway trough drawing the lines i realized two things. One I would need a bigger page and two this would be a waste of time!!!

[updowndown]

How do you do 101*2, or just 0*2? Can't use zero => Feynman would throw this technique out.

[numb1010]

it works for 101x2 (split 101 into 10 & 1), & for 0x2... well, that's 0

[trombone7]

No one said this is the easiest or most efficient pen and paper method. But anyway, this really pisses of the English for some reason. I'm hearing "bloody diagrams" and "effing rubbish". Hmm. I think its cool. It makes math a puzzle to be solved in more than one way. What's the big prob ?

[joshslocombe88]

that is the shittest thing ever, i can do it quicker in my head instead of stupid bloody diagrams, trust an american to come up with it!

[queenlover8]

you clearly have no idea who Richard Feynman is. You Fucking cock!

[hfjkshdajkfhsda]

fuck you! if i ever join the army, im invading wherever your bitch ass is from! GO USA

[xoZombieeGirlxo]

Wtf? That's pretty cool. But weird.

[vecter]

This puts real meaning to the phrase "cross product"

[athanasy1]

Neat.

[Fyziksman]

It is not real useful, but it does show that math can be done indifferent ways. I plan on using it as an exercise in my algebra 2 class.

[ingearchy]

it´s kind of funny but it has nothing to do with feynman diagrams.

[xyrlocshammypants]

Another algorithm.

[gresszilla]

the fuck has this got to do with feynman diagrams?

and this is exactly the same as doing long multiplication except harder and a pain in the ass with anything involving a 4 or higher

fucking rubbish

[gustavonarez]

hey, how do you do 987*789? What's the process in that case? Tell us please.

[eazylee369]

it's alright for low digits, but try something like 987*789.

[dezziangel]

i'm confused???

[moronguillo1187]

YOU SUCK AT MATH!!!

[BaybehG]

I thought it wouldn't work, I've tried it with alot of multiplications and it does work...took me a while to understand it though as i'm crap at understanding..But it works, cheers!

If only I learnt how to do this in school lol xxx

[edablinker]

So how is this related with quantum field theory?

[m4dn3ss]

I'm asking that question myself now ... ,:-?

[pidgefish]

if anyone would take the time to play around with this, they would realise that it does not work for most multiplications. And no it has nothing to do with feynman diagrams which are used for representing sub atomic interactions.

Don't hate on the fellow who created it though.

[CamiloSanchez1979]

is this related to a feynman diagram in any way, if not, then why do u use his name?

[DERVE4]

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[oogashakaooga2]

This has NOTHING to do with Richard Feynman, Feynman diagrams, Quantum Electrodynamics or even mathematics for that matter.

It's a fucking stupid pencil and paper parlor trick that the retarded piece of shit that posted this can't even figure out why works at all while anyone with half a brain can see it and how useless it is.

Seriously, you're insulting the memory of Richard Feynman with this travesty.

Fucking stupid.

[random3141592]

Hi atlasshrugs2000, thanks for sharing this cool graphical trick. In math lingo, this is something they call a convolution. Microprocessors use the same scheme, plus some extra tricks (fast fourier transforms) to carry out multiplications very fast, instead of using the traditional cumbersome scheme. It´s really a pity that most students don´t learn multiplication this way, it´s much easier!

[oogashakaooga2]

You're a fucking retarded piece of shit, aren't you?

What you said made no sense, dipshit.

I'd be surprised if you knew what Fourier Transform and convolution REALLY means, because it has nothing to do with arithmetic multiplication.

Next time, just shut the fuck up, retarded.

[random3141592]

Please see the book Numerical Recipes in C (Press et al.).

[asherwade]

This is like the fellow who shot an arrow at a tree, then went and drew a target around the arrow;...bull's eye everytime!

[dbuezas]

It's nice, but this "method" fails when you have "carry digits" (55 x 55 for example)

Also this is to Feynman's diagrams as "masturbation to sex" to put it in his own words.

[yousuckmorethanido]

try solving 97x98 ;) , but nice trick anyway

[koolyoh213]

interresting trick in math :D

[cracky659]

this is more complex then it needs to be, honestly. how stupid can u be not to figure these out

[crashtv]

this is more complicated than it needs to be.

[jupiterjjrm]

This is precisely what you do when you multiply. Exactly every operation you do when you multiply is done while counting the dots: 123 x 214 = first you get the 12, then you get 1x3+ 2x4 in the ten's (i.e. you must add a 0), etc. If you use the distributive law (100 + 20 +3) x (200+ 10 +4)=100x200+... you get all dot contributions - BELIEVE ME, THIS IS NOT A FEYNMAN DIAGRAM!!

[seneca67]

I used to count dots when i was a kid. lines dots , oranges, or whatever, it gets combersome after awhile. Still the geometric relation was interesting. I prefer still prefer the monte carlo method.. guessing, lol

[dph79]

Feynman pioneered the use of Feynman diagrams to make calculations in Quantum Electrodynamics, for finding S matrix elements, easier. This is basic high-school maths that has nothing to do with Feynman diagrams!

[mike11992288]

I think that the number of rules that you have to learn to calculate like this is most important than the usual way. But peoplelike to cheat you that they can do all thing like this...some people claims:" ah, you know, there's 56! permutations here, and count that, and you have 349/34 related to this graph, so easy ? isn't it ? and never calculate some horrible integrals; i'm a genius!",typically, phd stutend in knot theory or quantum field, and maybe in many area too. absolute idiot

[kprabhakar975]

It is amazing. It makes mathematics most easy

[tennisplayer103]

yes u can do more then 3 digits! u can do unlimited number which follow this pattern, but it gets too awkward and there are too many limitations of drawing straight lines and having the ability to count dots hahaha. not many people want to count a thousand dots

[mayamachine]

I like it it's a good way to show how math can describe things in the material universe, anything that helps people learn and makes them want more is good.

[vermillioncatcher]

Crossing two sets of parallel lines and counting the intersections is the same thing as multiplying the two numbers. I dont see how this is supposed to make life easier in any way, you still have to "carry the one" as it were any time you sum over 10.

And this has nothing to do with feynman diagrams. In fact im very skeptical to the suggestion that feynman had anything to do with this, since Feynman was a clever man, and this method is not very helpful.

[ElPeejerino]

While this may be a very cool little way solve simple multiplcation problems, it is *not* a way to solve quantum field theory equations, and it is *not* a "Feynman Diagram".

In four days I have an exam on Nuclear and Particle Physics as part of my 3rd Year Physics degree course. I can assure you it is not this easy.

[Exodws]

CHECK THIS AMAZING VID!!

/watch?v=L481xxJzzh4

[unemployedfreak]

Does it become unwieldy when you use digits larger than 3?

[alexsdestiny]

nope. i've tried 1211*3222 and it's correct :)

[unemployedfreak]

But those digits are all equal or less than 3. I wonder if the computation invalid or just too awkward for digits larger than 3.

[BigEagles33]

It's gets harder and harder.

[tennisplayer103]

do it urself, u dont wana be drawing too many lines everywhere. do this sum 987*698 u have 47 lines going all over the place. It is solvable, but physically impossible to draw that many lines on one page :D

[BigEagles33]

well he didn't show you how to do 4 digit numbers did he?

[Eidolonia]

sweet!

[Un5een]

now this is COOL!

[9sam1]

Calculator

[gustavonarez]

LOL

[Clarke54321]

BRILLIANT!

[kayaksta]

now i will impress my nerdy friends

[ArcticGarlicX]

The simplicity of the process to acquire the sum is what is relative to all things. i.e. Planes traveling at accelerated speeds hit tall towers, causes mass destruction, buildings pancake collapse.

[TorstenHellmann]

It's very simple. Essentially, you're doing the same as when you're multiplying the numbers by hand on a sheet of paper. With this method you replace simple multiplication of one-digit numbers by counting the knots, and in the end you sum it all up.

[1tinsoldier]

very cool.

[conservaguy]

This is pure genius. Thanks.

[anibyas]

Real nice. Thank you. I'll remember it. I feel i'm at school again.