Multiplication without multiplication tables

[efrankl1]

this is Fun Math, do you think doing division is the exact opposite?

[TyYann]

@efrankl1 Actually, I found something like that. You multiply both column by 2 each time, and one column will start at 1. I might make a video on this in the future.

[Gaiacarra]

I find it easiest to break it down into steps with distributivity

13 = 10 + 3

so 27 x 13 = 27 x 10 + 27 x 3

= 270 + 27 x 3

and 27 x 3 is easy

[zrylam]

as soon as i saw 27 x 13 i just did this in my head:

(average)^2 - (difference / 2)^2

= (20)^2 - (7)^2

= 400 - 49

= 351

much easier, just memorise your perfect squares lol

[ChocalateIpod]

wtf its easier doing it the original way. it takes hours doin it the way u show us

[TyYann]

@ChocalateIpod It's also quicker to read the video description...

[NehuAbhay]

Good to know a new technique ! Thanks.

[youlovemathematics]

If you want to become good at math go to my youtube channel: Youlovemathematics. On my channel I will teach you everything about math step by step. I will start with teaching you (necessary basic math skills) and then I will teach you the more advanced math topics. Just click on Playlists when you are on my channel and you will be able to watch my math videos in order. I promise that i will teach everything in an easy way. Math is easy if you have a good teacher.

[reny306]

hihi math suck's !

[InvaderShad0w]

One problem.I CANT DIVIDE

[UTleochi]

Thank you for that nice video - I always love to discover new ways of playing with numbers and I think knowing more methods than those one has to learn at school is always refreshing. Sadly most people seem to be too lazy to use their brain to discover new paths. ;D

[TyYann]

@UTleochi You're welcome!

[owenbutler5]

This takes too long!!!!

[pandebono9478]

if u dont know the tables so use the calculator just that ez

[skata616]

Drink coffee ! έλεος!!!

[TyYann]

@skata616 Sorry for that, that was my first ever video. I'm actually a coffeeholic... Check my other videos, you'll see.

ευχαριστώ

[antonioscheel]

that will take you years!! another one for 11 times tables what you do is for example 72 X 11 split the numbers in half so 7 and two add together 7+2 = 9 then this number goes in the middle hence 72 x 11 = 792 or lets say 79 x 11, 7+9= 16 carry the 1 onto the 7 so 79 x 11 = 869

[PlasteredDragon]

"Forget those &^&%@& multiplication tables?" Well, this system of binary math is interesting and it works, but it's a more lengthy process than multiplication. We'll be multiplying for the rest of our lives, we only need to learn the tables ONCE. As unpleasant as it is, I'd recommend learning them--it will save much more time in the long run. Besides in the 12x12 multiplication tables you really only need to memorize the 2's, 3's, and 7's... everything else just falls out with rules.

[TyYann]

Sorry for the "&^&%@&", it was just a joke.

I'm a math teacher, and I know how multiplication tables are useful. I'm not questionning that.

Read the video description, everything is explained there...

[buggeazy102]

plain an simple i suck at math!!

[anthonyalires]

Omg I think I just a lil less intelligent for having watched that...

[Fredericxmalone]

It is easier, but doing the addition part is a little bothersome, especially mentally.

Maybe you have an alternative to dividing numbers? or even adding them?

I am that desperate.

[deezynar]

I've never seen a system that claims to simplify math that doesn't have 12 rules w/ 8 exceptions. It's easier and simpler to just memorize the multiplication table.

[TyYann]

This system doesn't claim anything. It's the method used before the one with the tables.

Of course the one with the table is easier, that's why it's the one we use!

;~)

[roflcopter414]

this is quite an interesting method.. i shall try it out with other numbers :P

[toolucky1ever]

13 devided by 2..Of coorse 6.5..Forget about 0.5,nobody cares...So it's 6...Ha ha ha ha!!!

[buskerbuoy]

Maths is beautiful

[chan0chap]

lmao he actually used the multiplication table

he used it when he doubled

[TyYann]

As already explained, you dont need any multiplication table to do, say, 352×2 :

352×2 is... 352 + 352,

ie an addition.

No table needed.

[chan0chap]

but still doubling is the multiplication table of 2

technically your still using the multiplication table.

[ammuine]

Whatever.

[hectorandrespv]

could you reload with soothing music ?

[1imax111]

can you make a video proving how this works through algebra?

[TyYann]

Well, it's just a binary decomposition of the right-side number, nothing very difficult.

But I'll think about it.

[Theinvincibleone]

How can a factual demonstration of a proven method be "dumb"?

[Theinvincibleone]

"Nobody cares about the half." : (

[MWSJoey]

I love over complicating things. This is an amazing way to do it. To bad it does not help me in calculus.

[SeanHSL]

This is dumb.

[moon22666]

Too slow.

[Patternpop]

Awesome!

I love math.

[rodritecx]

13 x 21 DOESNT work with this method????? please explain

[wubs23]

you are right. it doesnt ^^

[8rD]

13 x 21 does work with this method, you just have to follow the instructions and remove de rows with even number on the right column (column with number 10 and number 2)

Final result 13+52+208 = 273 (=13x21

[constantin1313]

Thanks NASA for sticking with the "suck ass" mathematics.

[mspchaitanya]

Thanks TyYann....Keep posting such videos!!!

[mortarman22]

by the time you got that crap done you just do it the right way lol and have time to smoke a cig and call your math teachers daughter

[TyYann]

Right. But speed is not the point here.

[BEAUTIFULmetrah]

It doesn't work with 54x14 coz it doesn't have even number.I don't believe.

[JazzMusic79]

I have not tried it yet.

[BEAUTIFULmetrah]

YOu should try then you can help me lol.I can ask you for help without permision lolll.

[TyYann]

54 14

108 7

216 3

432 1

On the RIGHT you get rid of the even numbers and to their counterparts (even or odd, doesn't matter, on the left).

Here, you get rid of 14, because it's even, and its counterpart, 54.

You then add :

108 + 206 + 432 = 756 = 54 × 14

[BEAUTIFULmetrah]

Thanks i was doing exactly like you lol.If in the right column we doesn't have an even ## what should i do?Thanksss

[TyYann]

Just add ALL the numbers in the left column...

Try 32×31

[BEAUTIFULmetrah]

Thanks fro explaining do you know i decided to do multiplication table lol coz it's better .Thanks that's a good idea.

[DontCar3BoutU]

thanks :P that helped my sis wit her homwork .

[Gollywog]

it doesn't always work. 126x16

[TyYann]

It DOES always work, any mathematician can prove this. As for 126 × 16 :

126 and 16

252 and 8

504 and 4

1008 and 2

2016 and 1

Only 1 is odd in the right column, so you keep only 2016 in the left which is the result :

126 × 16 = 2016

[firestorm811]

Time consuming yes but if you don't have memorized multiplication tables to 9's then it gives you a way to solve.

With a little practice you can multiply any two two-digit numbers in your head in about 3 seconds but you need the "memory upgrade" do do it.

[ContentAnimeFan]

Yeah, it worked really well.... but it seemed pretty time consuming to me. I'd rather just multiply everything serperatly.

But what do I know, I balloxed up the word 'seperately'

[outthetube]

This is 100% ancient Black African mathematics taken from the tombs during White scientific expeditions in Kemet (Egypt). Unfortunately when Euro-Westerners and their partners in crime want conceal the Black African origin of techniques like this, they use the vague term "Mid-East".

[Pokemon4949]

well the teachers care :P

[Barttoocool]

omg that worked as well i tested it myself

[hukootuna]

YOU WOT JOHN

[RPalacios6]

u have hairy arms

[DefJay7]

I was thinkin the same thing RPalacios6=D

[ChocalateIpod]

@RPalacios6 ROFL hairy arms

[joesteinbock]

Interesting.. Thanks for sharing!

[maxmadx]

i guess im the idiot then. sorry

[maxmadx]

yo are an idiot. multiplying a number by 2 isnt using a multiplication table... no?

And it was the romans that came up with this method- which originally was originally done with roman numerals - hence "no timestables" claims.

Honestly, get your facts straight before trying to educate others and claim some sort of authority on the subject.

[TyYann]

Thanx for calling me idiot, I appreciate your enlightment on my condition.

Multiplying by 2 is not using multiplication tables. You can do it by ADDING a number to itself. It is a simple addition. Think about it: 123×2 = 123+123

Amazing, isn't it? But I am the idiot here.

As for the Romans, they weren't the first to use this method. They didn't invent it.

I don't claim to educate anybody here. I just show a method I know. I don't claim any authority on the subject.

Thanx again,

The Idiot

[lionzion22]

I do believe this method was first recorded in Egypt, which is in africa, therefore it is a method from africa, not the misnomered "Middle East".

However, thanks for the vid, and try to ignore the idiots who for some reason find a problem with it.

This only illustrates how "numbers" work in a harmony understood by older cultures, which is a bit more difficult to see using modern ways of multiplying. It's been dumbed down to a matter of memorizing these days.

[RedVelvet777]

Egypt is technically in Africa but many people think of it as in the Middle East because it is so close.

[HAMLETOIS]

This method is old and really outdated. I have great respect for the method but I will never use it. There are better methods, why use and impractical method at all? Einstein said something like the simpler formulas describes best the laws of nature. Why then use complexity? I thank you for increasing my knowledge of math--non-the-less. We need to see what is and is not possible in the world as Plato used to believe.

[SuperBrilliance]

Using ancient techniques of tribal hunters.

Brilliant!

[milky1041]

Cool this math should be taught just to show respect for the forgotten original mathematician of Africa

[pkmn75]

ur racist!

[milky1041]

ur jealous

[MisterNumbers]

An option that works is EZ Times Table. Click on MisterNumbers for a link to the video of a 2nd grader learning multiplication in an hour. Students make fun patterns on empty columns and create the whole times table. It is available on Amazon or on the web: EZTimesTable. Go there for a link to the video or more.

[WillBePilot]

ALl came what now is IRAQ !! land of civilizations

[mzkrizzy]

( I think this method ish harder >.>

[NovaHorizon]

hmm.. It seems several of these people don't realize that you're teaching them binary mathematics. It's interesting to learn how a system that only understands 0's and 1's can multiply and divide using base 10 numbers.

[blackfire1990]

I think there are faster methods to calculate such numbers. Maybe with bigger numbers it seems to be easy. Thanks for uploading anyway...

[TyYann]

No.

I just mean this method is not that stupid.

And I never said it was fast.

[TyYann]

Well, maybe YOU can't.

But your computer, calculator, cell phone use exactly THIS method to multiply...

[BoilingPoint212F]

It took you 3 minutes to multiply 13 x 27 *** from 1 min 45 sec till 4 min 45 sec ** Thanks but no thanks. LOL , I'll stick to the long way , it only takes 10 sec .Without a calc. that is.

[TyYann]

BTW the origin of this method has been already discussed in the comments.

;~)

[TyYann]

That is not the point here.

BTW, a calculator uses this method to multiply...

[OpteronO3]

wow, interesting, i never knew there were other ways for doing multiplication. but i don't understand how people say you don't explain it good because i understood it the first time...

[ivionday]

cool but a little slow paced. Cool

[bicnarok]

wow

[dowling1981]

bicnarok - have you portained them?

[outthetube]

You need better explanation skills.

[malins2000]

I tried it for 373 x 27 and it's doesn't work.

And I can't find out why....

[TyYann]

373 27

746 13

1492 6

2984 3

5968 1

373

Remove 6 and 1492

Sum the left column

373+746+2984+5968=10071...

Works with me.

[lazyhippy94]

56 x 2 is 112...not 108 =/

[TyYann]

It's 54 on the video...

[rapmsc]

How about 26 X 12?

[TyYann]

26 and 12

52 and 6

104 and 3

208 and 1

12 and 6 are even, so you keep only 3 and 1. Thus, you add their counterparts : 104 and 208 which makes... 312.

[georgeeneter]

tried it some times and some numbers did not work like 216*17

[TyYann]

216 and 17 432 and 8 864 and 4

1728 and 2

3456 and 1

2, 4 and 8 are even.

So only 1 and 17 remain.

So you add 3456 and 216, which makes 3672. And 216*17 equals 3672.

[ntoyzaster]

hi there.just a question.you say here that 2,4 and 8 are even but in other calculations of yours like 26x12 you only say that 6 is even with 12 but 3 also is even with 6 and 12.if you can help me understand why you said 2,4 and 8 are even at 216x17 and the 3,6,12 are not even in 26x12.thanks in advance and sorry for my bad english.

[TyYann]

You misunderstand the meaning of "even number" in English.

Even numbers are :

0, 2, 4, 6, 8, 10, 12 etc. (2×n)

Odd numbers are 1, 3, 5, 7, 9, 11, etc. (2×n+1)

[ProphetVictory]

yes but the "Middle East" has been made up. 100 years ago that area was called East Afrika!

peace

[TyYann]

Yep. I just mean it was invented THEN in what is NOW called Middle East. No harm intended.

Peace

[ProphetVictory]

that was very enlightening but could i point out that egyptian and ethiopian mathematrics originated in Afrika not the "Middle East".

keep up the good work!

[TyYann]

I agree with that. But Egyptian or Ethiopian is the name, not the origin. I've been told it was actually from Assyria or Babylonia...

[roby1211]

Thanks!

[TyYann]

You're welcome. If you have any question, don't hesitate!