Amazing Method of Multiplication

[SWE370]

Can you describe for me how you think. I don't understand :'(

[Veovisce]

Have all you haters considered the possibility that this method isn't being presented as a "faster" or "better" way of multiplying? Maybe it's just fucking cool because it's an unexpected pattern for finding a solution. Could -you- have thought of a geometrical pattern that would do your arithmetic for you, irregardless of whether or not it was "quicker"? Somehow I doubt it. Appreciate it for what it is and not just what it can do for you.

[excavtrooper]

I for the future with this crap, NOW ,...21X42 =20 X 42, ( double the 42 [84] then stick a nought on [840] then add 1 X 42 = 882......er... is that too simple or what?.

[mpdotf]

that sounds a wierd method, but i'm really cool with the traditional way,if you want to teach people something useful, teach them how they can do this calculation without a paper and a pencil (just in their mind )

[Ripper177]

ya know? i calculate the same way, but without that shitty diagramm. why the hell should i draw it in the first place? i'm happy that they don't teach this shit in germany... well, i hope so. i don't know whats going on in elemantary schools these days

[kapuoe]

i use a calculator

[Evanisawesome54321]

good for baseball players

[doublepilot]

what about 52x37 on this method?

[LeTinctoire]

@doublepilot Assume x conc y = x * 10 + y is a left associative operator. Note that (x conc y = (x + y div 10) conc (y rem 10)) [intuitively: you can transfer the 'higher' numbers to the left side], where div and rem are operators for integer division and remainder. Then the result is

2*7 conc 5*7+2*3 conc 5*3=15

= 15 conc 41 conc 14

= 1 conc 5+4 conc 1+1 conc 4 [transfer high numbers to left part]

= 1 conc 9 conc 2 conc 4

= 1924

[LeTinctoire]

@LeTinctoire And ignore the =15 on the first line. >_<

[dreamstorm0000]

But think about it this way: given a test with no calculators allowed, you can use this much more cleanly than trying to keep columns of numbers straight to avoid mistakes. This setup has a place for everything instead of adding row after row of long multiplication steps that can easily end in mistakes especially for those who are not experts at doing math on paper. Plus for a really visual learner, this could be especially helpful in organization.

[mi9worm]

It's just a fancy way of setting out the traditional way, most ways are.

[sk8ites]

Amazingly S.....L......O......W

[saffnpepa]

who wants to stress out. i got a calculator and it saves time. is why you get to use em in exams lol. im a genius, i can push buttons and you get paid millions for that.

[Msbooty15]

is this a lesson in art? XD

[WarFreak131]

this takes so long, heres how i did it in a few seconds

42 x 21 = 42 * ((10*2) + 1) = 42(10*2) + 42

42 times ten is 420, double that for 840, then just add 42 for 882

[circeanpoison]

That's fucking retarded. Takes so long, regular multiplying is easy and quick.

[NorcanDiaboli]

looks messy :/

[AricsBIGGESTfails]

Cool idea!

[72dew]

umm...i can pretty much do this in my mind

[ahtartersauce101]

I call it the baseball diamond technique :)

[renyhandayani]

hey dude!! It is just one of the methods you can use to help you solve multiplication problem..any method, no matter which you wanna use, as long as it is correct and make you understand better, will be just great

[dialgoraxx]

awesomeness, great job!

[slayingduck]

took me less tahn 10 seconds to solve that

by jus using my head :)

[Corinne6531]

42x21= 42x20+42 ====> easier and faster

[CodeOmega0]

It's the exact same system that schools used to teach, just with a stupid diagram that wastes time drawing.

[Necrosis57]

This only works if the products of the digits are all less than 10. Otherwise there is addition to be done. This is really just multiplication without carrying.

[MrCrisRocksz]

the answer is not 881, its 882

[SavetheStarving]

Bullshit,'z . Just multiply like normal and it will be faster and less confusing.

[ABAB23232]

malakies

[Minertorus]

Christ. People! Learn to do it in your head, not in notebooks! Diagram is just a visualisation!

[Eadlir]

Minertorus, diagrams is very good to show other poeple how you found out the answear and it makes it easier to explain so diagrams is better than calculate it in the head.

[GooShamman]

86 x 37 = 3182 but i got 246042 by following him

[Duckman1616]

It only works with the numbers he's using.

[sk8ter16fl]

U did your math wrong... it should come out to 247442 the "74" is a 2 digit number give the 7 to the 4 in "24" and give the 4 to the 4 in "42"....

24+7=31

4+4=8

3182 is the answer

[chjoezen]

Actually, it only works when the numbers don't = over 9 when multiplied. When you get numbers like 24 74(not 60) and 42, it gets more complicated. You have to add the first digit in the second number(7) to the first number(24) 24+7=31, then you have to add the first digit of the third number(4) to the second digit of your second number(4) 4+4=8 and then you have 3182. And if you want to multiply numbers with more than 2 digits, you'll have to draw a whole new diagram.

[UTleochi]

Nice way to make kids eager to do maths and have them train their multiplication table in a playful way. :)

[godfarther12]

27 x 82??

[chjoezen]

You get 16, 60, and 14

Add 6 in 60 to 16 

6+16=22

add the 1 to the 0 left in 60

1+0=1

2214

[bobbytimberlake]

What's "amazing"? All these "tricks" are just cutesy ways of writing out all the digit pairs with lines or boxes or lattices connecting them.

You're still multiplying each digit by each other digit and then grouping them by power. All these "tricks" just do the same thing but take longer.

[markgriz]

Exactly. Nothing amazing about this at all.

They teach this crap in school now, and by the time the kids are done drawing the damn diagram, people who multiply the traditional way have already solved the problem.

[naacarricoman]

I have to agree with your comment!!

[cheeckyPoo]

@markgriz i dont think you get it child.

[LovE4FirE]

@markgriz The reason you can do things faster the traditional way is because it's the way you've learned and done it your whole life. If you were taught another way, you would think the traditional way was unconventional, which it is because we just go through the steps, we don't REALLY know what we're doing, we just know the process. Granted this method probably isn't the best way of learning, but there are plenty of others out there better to teach than the traditional way.

[markgriz]

@LovE4FirE

"Granted this method probably isn't the best way of learning, but there are plenty of others out there better to teach than the traditional way"

Name one. I challenge anybody to make a video showing how to multiply 2 4 digit numbers

together faster than can be done the traditional way.

[dragonzlyric]

this takes longer, but good job

[gio2475]

I've never seen this before. It's interesting and yes, it does work for 26 X 65. You just have to carry.

[goskoo04]

nice video very easy

[jesycachin]

36x98 how?? cant le.

[chjoezen]

This one helped me realize I was doing it backwards. 36x98 you get 27, 78, 48 The 8 in 48 is your last digit working from right to left Add 4 from 48 to 78 4+78=82 the 2 in 82 is your next to last digit Add the 8 from 82 to 27 8+27=35 35 is your first 2 digits 3528

[drakezen]

Doesn't work. try 26 X 65