Solve Multiplication Problems by Drawing Lines

[wade9638]

21x13=273

[Justevev]

Wait how would you do 10x10 then?

[BenRHarsh]

@Justevev [down-right] 1 line, no lines. [down-left] 1 line, no lines. Looks like: <

Left side has 1 intersection, middle has none, right side has none. 1-0-0.

[Arcon1337]

@Justevev in your head coz it's bloody easy.

[johnybonnfiresokko13]

what are the limitations to this here thingy... umm system? cuz i tried 45 by 12 (and idk if i did it wrong) but i got 492 :/ which isn't right....

[IronyImpact]

@johnybonnfiresokko13 you did it wrong lol

[russianrocker1]

@johnybonnfiresokko13 you did it wrong, i got 540 when i tried it

[lifeispuzzle]

AMAZING! :D :D :D HAHAHA! Simply unbelievable!! HAHAHA! I'm impressed!

[Gassebol]

Just use your head and practice..

864x531

864x500=432000

864x30=25920

...add=457 920

864x1=864=1000-136

...add the thousand=458 920 ...and then minus 136= 458 784!

[soniajoshi20]

its really agood trick

[Sasukethehedgehog]

its ok, but ill stick w/ my finger trick.WAYYYY faster.although its only from 6-10. but cmon, who doesnt know how to multiply from 1-5? =.=

[Chelitoronaldo17]

bet 100 bucks its a geek with no life

[nezantra]

@Chelitoronaldo17 bet 100 bucks your an idiot who has no respect or good grades

[Chelitoronaldo17]

@nezantra jaja a person is actually butthurt jajaja wat a dumbass

[twilightorsenluvrx8]

this is crazy!! my mouth was open the whole time i watched it :O

[lookatme4]

pretty cool but takes longer.

[iphonePhil]

it rocks!!!!

but try this:

999 x 898.... gets a bit complex to calculate...!

[heydude09876]

its alot of lines! i can tell you that!!!

[drukqsMORA]

So, 8 + 1= g?

[markljesse]

its a 9 not a g

[marystinks]

oh and this takes longer than doing it the hold fashoin way? 10 10

x-------- 100

so much easier

[nezantra]

x10=xdigit0.

Terrible argument.

[cate459]

C'mon!

This technique is useless-

Try drawing lines for 465 x 248

What then? Count all the intersections?

Using 1, 2, 3 is too easy

[lilnino84]

Does anyone know the name of this method? We have learnt it in college but the tutor couldn't tell us what the method is called.

[rukzrox]

dat is so bludi gay man, if sum1 asks u a question its not lyk ur gonna go grab a pen n paper and start working it out ,its just better if u jus say it by heart DUH!!!!!!

[meragonmalar]

yeah this its great and easy

[MaryStewart]

3g483? hehe! nee better '9's!

[TheCrookedFinger]

I wonder if this would be the start of a proof, proving the connection between multiplication and addition????

Anyone?

FRAKH

[wassup23596]

lol thanks. you just made my math homework a heck of a lot easier and accurate!!

[scumgod13]

I'm baffled.. It works! However, it does seem simpler jst to muliply (for most I suck with math)

[handicapable124]

id use a calculator,or do it the way millions of ppl know how to

[AxxlAxxlAxxl]

it was cool but complicated (the last part)

[MuhsinTheMomin]

a nice method but i pefer Fibonacci's Liber Abaci multiplication technique.

[DJcrackbitch]

3g483 Sorry wrong answer. Im just kidding, thanks for the tips :).

[sargam124]

that was too good......gr8!!

[macthug2pac]

Damn!

That is kool as hell

It looked kinda complicated to me tho

[jewkillerdude]

remarkable...just compleatly remarkable

[swizzero84]

It takes more place as in mind, but it's easy to handle.

I try to explain why it works. By crossing the lines you multiply every number whith each other and add them together.

If you have numbers with seros "103" for example, i make an elipse. It's only a placeholder, never multiply with "0" ;o)

[deadnivor]

This is a simple way to do multiplication problems without learning anything.

Ehehe, I like that way of thinking, it leads to more Darwin awards I can laugh at!!

Idiots....

[jeanniealbert]

you don't get the point man. The trick is not about being able to calculate, but to find answers in other ways than the usual ones. I find it amazing !

[masterfigo]

indeed. To think about this, it needed someone really intelligent to understand that geometry could give the answer. Morrons are those who stick with what they've learned since their childhood and don't evolve.

[2young2die2drunk2liV]

I THINK U NEED ENGLISH LESSONS FIRST!

[Coala911]

well its good for makeing somthing look like a field

[Klanguz]

i can do that with my mind 4 times faster than drawing f*cking lines...

u idiots...

[gmanos007]

if anyone knows who invented this method or has some explanation, please send me

[TheOptimizer]

You sir, are retarded.

[Likeafoxow]

why make a 34sec problem a 2 minute problem?

[ebutuou123]

This method derives the procedure to do vedic multiplication. You wouldn't actually do it, but its how you figure out the steps to multiply a number.

[ebutuou123]

I noticed that this is the concept behind the cross multiplication in vedic mathematics. But what do you do when you have zero's in the number. For instance you have 10*3, how do you show that pictorially? Or if you have 103*27. Thanks. I like your posts!!

[FRQDO]

about the zeroes... just use a dotted line as a placeholder and remember not to count the intersections with it.

i tried it with both your examples and it works. hope that helps u.

[ebutuou123]

Yeah actually you just dont even need to draw the lines and I think it still works.

[goofisF4rt]

FAKE!!! he did NOT really draw those lines. it was computer special effects

[tigerbrian44]

thanks man now i know how to draw a baseball course

[EvilJackBall]

wtf is a baseball course?

[tigerbrian44]

1)i meant field

2)look at example 2 the at the end i looks a bit like a baseball field

[recklessintensity]

amazing! thanks for sharing! never seen this before

[snoojie]

You print weird nines. Also, this is cool.

[ScottsOne]

You would have been quicker working it out thaner than drawing shit on paper.

[hockeymo]

to complicatoing but still prett cool

[horseyonpointe]

amazing! That's totally brilliant!

[freefromfolsom]

but how do you work out where the decimal point is if there is a decimal point?

[ni7enichi]

work it out? o_O

[freefromfolsom]

wow thats brilliant! thanks

[dynamicdave1983]

clever!

[sushabi22]

yeah tylerspiker its possible i think just count the corners from the outside into the middle. and for forthenoob: just add the tens digit to the number to its left just like adding vertically.

[forthenoob]

How do we know when to add the no at the bottom? Like the eight and one??

[TylerSpilker]

is it possible to do this trick on numbers more than three digits in length

[Hellcoam]

nice hands

[XBasketCase1039X]

Creative. But why would you ever need this, since it's so much faster to just do it in your head??

[manuel00081]

good but only for number with 1 2 3

[nandusz07]

LOL u should to try and u never wrote this stupid comment

[timtambourino]

um.. why not use a calculator... but neway cool trick.. still timewaster

[suikun245]

Cool! I've tryed 342x215 and it worked!

[phoinacup]

cool tecnique but completely impractical and a waste of time. literally lol.

[notme98]

that is one F-ed up 9

[mrzbomb]

but thats not the point, tasty.

[mhmmhm42]

Anything with only one digit factors is easy to imagine without drawing it!

[whowearshats]

you only used the numbers 123 in your equations.

There's a trick there.

[JBurneo]

yeah now ima scratch my whole exam with those lines itll be funny

[LemGambino]

This...Is...GODLY. Not bad, I'll think about doing this sometime with bigger numbers.

[jaydarrow]

I got this and i came up with the letter G... oh noes

[SuperBrilliance]

Now do 789 x 999.

[kewlkid147]

i just tried it and i cant even read it lol so if u have a problem like that u probrably want to use lattice or the regular mojo

[tastey]

Cant you just do it in your head I worked 123x321 out a hell of a lot quicker than it took to draw all that out, it's pointless

[zornvongott]

101 x 101 returns 121 LOL

[ClassicPo0h]

no... you count the 10 as a subject of a ten, not count the 0 as a singular unit in the ten column.

[Oyamada13]

Yea. When you are doing the line drawing for 101x101, you have to remember that 0 still exist. The mark 0 on the draw, you a dotted line. Anything solid or another dotted line crosses a dotted line is 0. zornvongott failed on drawing. xD

[jlajmfam]

I did this and came up with 3f483

[liminalityofrain]

This is kind of fun, but you have to make sure you're spacing everything apart enough and using the same width between your lines or it gets too hard to figure out which intersections go with which number place. Really interesting way to do multiplication; this is the first time I've seen it done this way.

[hypermused]

Try 99 x 99.. what a mess of lines that would be!!!!

[RJrig]

try 10 x 10 lol that doesnt work

[tjones514]

10 x 10 can work

when u draw the lines it appears that theres only 1 dot, but u have to remember thats on the far left of the drawing, and that the guy on the video splits it up into 3 sections, so assuming the next two sections have nothing in them, then their numbers would both be zero, therefore adding those to the 1 makes 100

i think

[dewinmoonl]

It's just a different way of doing multiplication. I'll stick to the tratidional way xD

But it's rly cool still, but imagein you do 999x999

T_T that'd be painful.

[imnotrich12321]

Think you might have problems with 9x9.

[RJrig]

nah it works with 9x9 there are 81 points

[RJrig]

it works as it has 81 points

[evilpupilvoid]

uhh so how are you supposed to know what to addd and which points to count. WAHTEVER.

[youthinkof1]

Yeah i think thats kinda wierd can someone tell me how to divide the lines...

[dr0psy]

someone get this dude a ti-83

[aliaze1]

damn...

[grizzlyadamsman]

get a calculater

[pjfreitas]

Really cool.

[TheBBear]

wow thats so awesome