Russian Peasant Multiplication Algorithm

[RaNd0mPiXeLs]

In soviet russia multiplication, number multiply you!

[kray97]

For complex multiplications this should be the easier method because it's easier to double, halve and add than it is to successive row multiplications with carrying and then adding them all together.

It's also a cool challenge to program this algorithm.

[SnowofLight]

Because someone is more likely to remember this method than to remember to carry a calculator

[raduborza]

This is the old babylonian method of multipling, there are some tables proving that...

[returnoftheramble3]

This is like the Egyptian method.

[returnoftheramble3]

They taught me to make grids in math, and I have a bunch of methods for simple things. I could make everyone retarded.

[theNijool]

hum multiply cheyyan ithra kashtapedandallo..!

vere pani onnumillaa

[returnoftheramble3]

just look at where I pulled the digits. Like, 6X2=12 then this 1+2=3 then +2 blah blah

[returnoftheramble3]

1622=352 6X2=12 3+2 =5 2+1=3 352

1722=374 7X2=14 5+2=7 2+1=3 374

1822=396 8X2=16 7+2=9 2+1=3 396

blah, blah

20X22 484 10X2=20 2+2=4 2+2=4 440

You can make it as annoying as you want to.

[dominicrules1]

brilliant video!!!

[DomFinn]

ah need better subtitles! good though

[burnedPaper]

how do you do it the three numbers

[ArcaneInquisitor]

Its too bad you can hardly hear him. He should put the audio through a noise filter and re-post it.

[forgotmypassword3]

I guess it's just the way you think about it and what you were using it for.

[eligao]

that's what ALU is doing, non EECS ppl are just so @@.

[Vybertastic]

amazing

[nullclean]

mumble mumble mumble mumble mumble mumble

[enetick]

math is a butthole

[gpardhu]

usual multiplication takes lesser time

[returnoftheramble3]

@gpardhu yeah, they designed it so that peasants would do worse and take longer, which is much more clever than damaging the masses. They dumb down the material in the midwest as well compared to the east coast. It's amazing. With us, they don't teach us methods. They give us plain information. Unfortunately, that has caused some of us to creatively make links.

[74jockj6]

this is mean video. this video helped meh heaps!!

[Cosmologicon]

Some people don't realize that the whole point is it's doing multiplication without a times table, just using addition. "Doubling" can be done without multiplication just by adding a number to itself.

If you'd never learned your times tables, how would you find 17 * 22? Not as fast as this, I'd bet.

[supergsx]

What the heck? Wow they sure took the long way...

[opheric333]

Otchen Xopocho

[hack451]

Neat. But, watching all these math videos and different methods, ultimatly I ask myself one question: can you use this method to do algebra and higher level math. If the answer is no, then you'll have to learn the old method anyway.

[arcaninetyyt]

so useless.

[berkut2006]

JUST AWSOME

[FA2A]

and now you know why they were peasants, they used an ass backwards algorithm to do basic mathematics. Neat trick but not very functional.

[newcoleco]

It's a binary computer way to do a multiplication with integer numbers.

22 is 16 + 4 + 2 = 2^4 + 2^2 + 2^1 = (bin) 10110

17 is 16 + 1 = 2^4 + 2^1 = (bin) 10001

Try using 17 instead of 22 to divide by 2, you will get a sum of 2 numbers (22 + 22*16), not 3 (17*2 + 17*4 + 17*16).

[teegrinsays]

lol i never knew that... thats cool