Easy Graphical Multiplication Trick
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International
- Comments: 118
- Views: 2,062,186
- Added: 16-Nov-06
How to transform a multiplication into a simple counting of points through the drawing of a square shape (original analogy was with a stool). It works with any numbers if you keep the right partition. If you use a zero, use a dotted line. When a dotted line cross another dotted line or a plain line, count zero. You can verify with your calculator! It's only meant to be a funny trick to show to kids not to be an efficient way to do multiplication. An application of this trick can be seen at: http://www.metacafe.com/watch/339625/easy_graphical_fractions_addition_subtraction_trick/ check our new video: http://www.metacafe.com/watch/410784/eating_fire/ More»
- The title is innacurate but i can't edit...
It's not a way to make mental multiplications easier, it's just a fuuny way to resolve graphically a multiplication. It's only meant to be a little trick to show to friends and kids who hate maths. It's NOT meant to be efficient as some seems to think. You can do any kind of multiplication with it but yes it's boring to draw numbers like 8 or 9.
By Akahad 1164108610 Reply Spam [+28] Moderate Up Moderate Down Remove
I didn't invented it but i would proud to because it's simple esthetic way to show the basic mechanism of a multiplication. You need to be quite clever to make this kind of trick.
My girlfriend learned it from some math teacher during her school years in china. He wanted to make kids interesed in maths and it worked. (In some china school, kids use stools to sit. That why he used this comparison for the shape of the network).
For all those who talk crap about this video: This one of the highest ranked of the week and one of the biggest gain of the producer program in such short time. I made 2000$ in 4 days. If you're so good to put disdainful comments, why don't you make a better vid instead of wasting text here ?
For those who enjoyed it, keep having fun! :) (new video coming soon)3244708- Beat the MATH
$2000 in 4 days? Nothing can beat that math... HAHAHA!!!
By Baganagta 1164209601 Reply Spam [+16] Moderate Up Moderate Down Remove3382776 - EXPLANATION
21•13 = (20 1) (10 3)
By daniel7 1172280916 Reply Spam [+3] Moderate Up Moderate Down Remove
= (2•[10] 1•[1]) (1•[10] 3•[1])
= (2•1)[10•10] (2•3 1•1)[10•1] (1•3)[1•1]
= 2•[100] (6 1)•[10] 3•[1]
= 2•[100] 7•[10] 3•[1]
= 273
In this case, for each number the first drawn lines represent 'tens', and the others represent 'units'. That is:
21 --> 2 'tens' lines (10 10)4482865 - EXLANATION (cont. 1)
In this case, for each number the first drawn lines represent 'tens', and the others represent 'units'.
By daniel7 1172281031 Reply Spam [+2] Moderate Up Moderate Down Remove
That is:
21 --> 2 'tens' lines (10 10)4482865 - EXLANATION (cont. 1)
In this case, for each number, the first drawn lines represent 'tens', and the others represent 'units'. That is:
By daniel7 1172281177 Reply Spam [+2] Moderate Up Moderate Down Remove
21 --> 2 'tens' lines (10 10) and 1 'units' line (1)
13 --> 1 'tens' line (10) and 3 'units' line (1 1 1)
Intersecting: (2 'tens' lines x 1 'tens' line) = 2 'hundreds' intersection points = 200
[That is: 20*10 = 200]
Intersecting: (2 'tens' lines x 3 'units' lines) (1 'units' line x 1 'tens' line) = 7 'tens' intersection points = 70
[That is: 20*3 1*10 = 60 10 = 70]
Intersecting: (1 'units' line x 3 'units' lines) = 3 'units' intersection points = 3
[That is: 1*3 = 3]
TOTAL: 273
Similar for the second example.
4482865
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- KEEP IT UP !
Well answered bro ! I would never believe this simple video would go this far. Congratz ( and thanks to your girly ;) )
By skrik 1164152766 Reply Spam [+1] Moderate Up Moderate Down Remove
Cant wait for the next video ( another secret from china maybe ? )3259664
4 telling me this trick i caN JUST USE THE TRICK WHEN MULTIPLICATINg
By zeozord 1166703262 Reply Spam [+7] Moderate Up Moderate Down RemoveThats very useful trick i like it man great job
By whatsupman143 1165283533 Reply Spam [+7] Moderate Up Moderate Down RemoveInstead of you all being such a "good" critics and insult this guy, you should praise him for showing all of us (at least the ones that didn't know that method) a curious way of multiplying.
Yes i know it is faster using a calculator, and yes, it is probably faster doing it the old fashioned way with pen and paper. But at least its a different way of multiplying.
Here are my 5 cents.
why don't you just accept it as being a cool way of thinking about multiplication? Mental maths is one of the things i excel at, and i wouldn't use this, but it's a fun and interesting way, and i think it deserves a good rating. It's not about what the best way is, it's about the different approaches you can take to things
By stfunoob 1164385257 Reply Spam [+5] Moderate Up Moderate Down RemoveCrazy jedi mind tricks
By artful 1163643844 Reply Spam [+2] Moderate Up Moderate Down Removethat's the explanation i was given when i learned the trick.
By Akahad 1163375871 Reply Spam [+2] Moderate Up Moderate Down RemoveThats Extremely good.. but I only saw evens and odds together.. like Example: 23 x 26.. and something like 321 x 123.. I mean, does it work the same if its unpaired.. example: 145 x 13.. Do u understand what im saying...
By Da_Latin_Prince 1186613062 Reply Spam [+1] Moderate Up Moderate Down RemoveI like this method, however I have come across one that I cant figure out how it works. 18 x 56 does not come out right, not sure why? Any ideas?
By bmorehokie 1170122374 Reply Spam [+1] Moderate Up Moderate Down Remove- addition
it works but you must be careful adding the differents parts: from left to right you ll have: 5 / 46 / 48. you must add 5 /4 6 4/ 8 which gives 5 / 5 0 /8 then 5 5/0/8 wich gives 1008
By Akahad 1197432689 Reply Spam [+0] Moderate Up Moderate Down Remove
the correct number3244708
i am so shocked you are really genuis and very intellegent i have just try for it in defferent numbers and the formula is working perfectly
By khyu 1168884033 Reply Spam [+1] Moderate Up Moderate Down Removelol yea do that XD ........o wait i have a calculator =)
By vids4$$$ 1207272268 Reply Spam [+0] Moderate Up Moderate Down Removethanks for this i can use this in my maths exam :)
By dubs07 1198453114 Reply Spam [+0] Moderate Up Moderate Down Removei didnt quite get understand it but im interested and im gonna look into it
By moseph654 1172127668 Reply Spam [+0] Moderate Up Moderate Down RemoveIt's great for the people who can't do, or it is hard for them to do mental math(this includes me). When you don't have a calculator this is just another way. Even though you would have to have great memory skills to be able to remember where to count your first intersections and such. But non-the-less it is still an interesting way to solve those annoying multiplication problems. :]
By deerweensquidxd 1171227905 Reply Spam [+0] Moderate Up Moderate Down RemoveI like it
By maf 1169178947 Reply Spam [+0] Moderate Up Moderate Down Remove- BUT WHAT ABOUT IF THERES A ZERO AT THE E...
How does that work? Please explain!
By Exanthias 1169250719 Reply Spam [-1] Moderate Up Moderate Down Remove4088029
but wouldn´t be faster to do the multiplication as usual .
By BlowUrMind 1168409296 Reply Spam [+0] Moderate Up Moderate Down Removewhen im bored in math class i'll do that instead of boring write out problems. just wtf is up with ur nine? it looks like a g.
By luckyduck 1167538125 Reply Spam [+0] Moderate Up Moderate Down Removethat its a girl not a boy
By CRITICAL KIDD 1166986296 Reply Spam [+0] Moderate Up Moderate Down Removethis guy earned more than $7,000 and u guys r callin him an idiot? maybe u need to reconsider who the idiot is
By conartist101 1165787830 Reply Spam [+0] Moderate Up Moderate Down RemoveThat's awesome - not very practical, but high nifty factor
By kc5ifk 1165538514 Reply Spam [+0] Moderate Up Moderate Down Removeit s amusing,ahah
By yayaniu 1165437944 Reply Spam [+0] Moderate Up Moderate Down Removeab * cd = (10*a b) * (10*c d) =
= 10*a*10*c 10*a*d 10*b*c b*d =
=100*(a*c) 10*(a*d b*c) b*d
All crosses is multiplies. You only make 4 multiplications (number of dots).
Same parts in case of 123*321.
i hope your "new one coming" don't be the rusian method 1(multiplication using division), the russian method 2(using fingers to multiply numbers from 6 to 10) or the arabig method for doing multiplication graphically
By peladan 1164493042 Reply Spam [+0] Moderate Up Moderate Down Removeshe paint so well
By DongPhuongSoc 1164289130 Reply Spam [+0] Moderate Up Moderate Down Removenice parlor trick to show to the friends
but i tend to use calculator... or a mobile phone on gmat test...
By sic 1164014636 Reply Spam [+0] Moderate Up Moderate Down Removedrawing 1234587964515 X 21358753982587=?
By //.. 1163837219 Reply Spam [+0] Moderate Up Moderate Down Remove- omfg
like you get that number at school. or anywhere.
By Hacli06 1163956009 Reply Spam [+1] Moderate Up Moderate Down Remove
Always negative comments.
Only reason for that is that you are jealous that you didnt came with this video first.
Nice Trick akahad3119237
I rather use a calculator..
By Misled 1163783436 Reply Spam [+0] Moderate Up Moderate Down Removedo it 99999x9999 and see wat u draw
By lo83 1163771564 Reply Spam [+0] Moderate Up Moderate Down RemoveBig props to you bro. Makes life a bit easier eh - so long as you've got paper and pen. Bugger if it's in your head.
I'm gonna have to try this one out next time.
than buying an asian kid.......how?
By cptmanok 1163756574 Reply Spam [+0] Moderate Up Moderate Down Removeguys..any body can tell me from where i should start put the DOTs? tks a lot
By Waz up ya 1163728766 Reply Spam [+0] Moderate Up Moderate Down RemoveIt seems there should be sound with this, but I'm not getting any.,
By bobmark 1163722988 Reply Spam [+0] Moderate Up Moderate Down Remove- No sound
There's no sound. I'm not good at creating music and i don't want to use the copyrighted ones. Maths don't need heavy metal. :p
By Akahad 1165449826 Reply Spam [+0] Moderate Up Moderate Down Remove3244708
Long Multiplication is quicker, easier and doesn't cost a fortune in pencils.
By Dayt 66 1163717720 Reply Spam [+0] Moderate Up Moderate Down Removeespecially when you have large numbers like 12345...
By lazyrom 1163704947 Reply Spam [+0] Moderate Up Moderate Down Removeit could help to make fun an arithmetic class for my son
By malo92 1163702964 Reply Spam [+0] Moderate Up Moderate Down Remove- zero
how you do with zero
By hhhhhhhhhhhhhhhh 1165048566 Reply Spam [+0] Moderate Up Moderate Down Remove3034905 - zero
how you do with zero like 302*32=...?
By hhhhhhhhhhhhhhhh 1165048270 Reply Spam [+0] Moderate Up Moderate Down Remove3034905
the usual way is easier and takes less time. Glad to see a different way though
By ZoglerMan 1163686079 Reply Spam [+0] Moderate Up Moderate Down RemoveThe crossing points are just multiplication, but through counting. It's way faster to multiply than to count, and you actually end up doing exactly the same thing, but perhaps in a slightly different order.
Just draw 1 line each time, but with a number attached to it, draw the little arcs, and then multiply the crossings. Same thing...
u only can do it ,if it 1 in the end of whole number. for example 31, 321, 71. and watch my video( new formula of mathematic> search:mathematic)
By salihin 1163644723 Reply Spam [+0] Moderate Up Moderate Down Remove- It works!
The numbers you are left with are:
By letmein1 1163649847 Reply Spam [+0] Moderate Up Moderate Down Remove
6, 22, 20 right?
(6 2), (2 2), 0 = 840
Remember with 2-digit numbers, the upper digit is added with the number to its left.3291282 - i did....
24 x 35 does word using this method
By albonator316 1163647315 Reply Spam [-1] Moderate Up Moderate Down Remove3262031
incase you forgot to bring your calculator
By jengkoil 1163630039 Reply Spam [+0] Moderate Up Moderate Down Remove321 x 123 =
I would multiply 321 x 100 = 32100
then multiply 321 x 20 = 6420
then 321 x 3 = 963
then add them all together 32100 + 6420 +321 = 39483
- obviously not easier to round off
You should try his method because:
By albonator316 1163647003 Reply Spam [-1] Moderate Up Moderate Down Remove
32100 6420 321 doesn't equal 39483!!
use a calaculator!3262031 - you made a typo
the last term of your addition should be 963 and not 321 (as you calculated previously), that's why people are saying you're wrong. But one might question their intelligence when you consider that your procedure was correct, thus it should give a correct answer ...
By Bingk 1163946803 Reply Spam [+0] Moderate Up Moderate Down Remove1847649 - No calculator !
Hey, the goal is not to use any calc...
By FuzzyGhost 1163704069 Reply Spam [+0] Moderate Up Moderate Down Remove
At least, his mistake proves that he didn't use one to write this post... How many of you really did 123 x 321 mentaly ?2622590
Interesting!! ...
By Mavreq 1163611110 Reply Spam [+0] Moderate Up Moderate Down Removeif only u can find that trick, before they found calculator...
ok, n now, where's my calculator...?
the solution is interesting .But there will be a certain of points to count...?...haha
By yayaniu 1163412970 Reply Spam [+0] Moderate Up Moderate Down Remove- yes
that's why he drew those lines circling the dots to circle, watch closely, you'll know which dots to count.
By KilluaZaoldyeck 1163606227 Reply Spam [+0] Moderate Up Moderate Down Remove1894822
I guess Every Problem has a Solution in itself!!! :)
By sidshadow 1199353659 Reply Spam [-1] Moderate Up Moderate Down RemoveWell that makes sense but how about the weird number 9, who can explain that? http://www.metacafe.com/watch/704894/the_best_math_trick_ever/
By andreipalatkas 1183565471 Reply Spam [-1] Moderate Up Moderate Down Removevery nice but missed out on something, http://www.metacafe.com/watch/609924/sweet_kick/
By good right 1180418851 Reply Spam [-1] Moderate Up Moderate Down RemoveNice Video...
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it works with 1,2and3 only :-D
By hafidovitche 1177000608 Reply Spam [-1] Moderate Up Moderate Down Removeque crack
By noestudies 1175622576 Reply Spam [-1] Moderate Up Moderate Down RemoveWell done. There's another cool trick here. Check it out... http://www.metacafe.com/watch/476990/derivation_of_cube_roots_from_any_perfect_cube/
By shwalker 1174450900 Reply Spam [-1] Moderate Up Moderate Down Removehttp://www.metacafe.com/watch/332976/great_math_trick_with_number_6/
By papitza 1173975602 Reply Spam [-1] Moderate Up Moderate Down RemoveThats cool technique, but it does get complicated for larger multiplication
there is good technique for squaring large numbers you can view it on..
http://www.metacafe.com/watch/454399/speed_calculations_squaring_large_numbers/
Cool graphics. But impractical to use for larger digits
Check out this funny prank : http://www.metacafe.com/watch/452926/funny_prank_vanishing_desktop_icons/
http://www.metacafe.com/watch/441990/cool_math_trick/
By shortdude1619 1172197222 Reply Spam [-1] Moderate Up Moderate Down Removegreat man how do you know about this?
That method is like methods of multiplication used in computer science, for instance ALU in CPUs.
Cool :)
i tried with other numbers (ex:6789...)
and it worked
ex 585x3=1755
5x3=15
8x3=24
5x3=15
_______
321
642
963
= 39483
aint that much easer than all dat
use a calculator. ........ this isnt mental btw. in mental sums etc. u arent allowed to write anything except the answers so.... thats considered working =)
By !@#!@# 1164125400 Reply Spam [-1] Moderate Up Moderate Down RemoveI prefer the common method of multiplication. Uses less paper and less time. Less margin of error, too...it could be simple to draw the arc in the wrong spot in this method shown.
By BeerInMyHand 1163991477 Reply Spam [-1] Moderate Up