How to Do Math In Your Head : Quick Math Tricks With Fast Multiplication Techniques

[099watcher]

i want old youtube back no adds before videos please.

youtube is doing a bad job.

[oiskin69workingclass]

use your fingers that's the easiest way with 9

[awaqar]

@oiskin69workingclass You can try this thing as well instead of the fingers. "Speed maths- Multiplying without multiplying". Click on my username and check the vid. Cheers.

[LegionofDeath100]

How to do math quickly in your head: Do this or learn how to count by 6s, 7s, 8s, and 9s, that's how I do my math.

[xIBeaTs]

I cant believe i just watched this.

[Reachl0C0]

Thanks ! Haha 

[rhenzb1000]

i know a technique how you can know if the number is visible by 3 you know think of any number like 6345 add the digits 6+3+4+5=18 so you dont know if it is visible by 3 yet so lets add the digits again 1+8=9 yes, so 9 is visible by 3 so 6345 is visible by three compute it and divide it at three no remainders haa! i watch it from math tinik

[rhenzb1000]

@rhenzb1000 i have another technique but i cant explain it well but i ope you understand. square of numbers ending in 5 i have that technique so you know that 5x5=25 but 25x25=? first you have to bring down 25 and erase the fives in the ones place then you know that there is 2x2 left so add one to a multiplier then it will become 2x3

i have told you that bring down 25 then compute 2x3=6 so put 6 in the highest place value then put 25 next to it so the answer is 625

[malingamurali]

OR!! you could just learn the multiplication table... an easy way to remember the 9x is: 9 x 4... take one from 4, which equals 3 (the first digit) and the second digit is 9 - (the first digit) = 6... 36 :D

[dDonDieSel]

Can you attempt this with the hundred numbers, also thousands.

[willghass]

anyone older than 10 who can't multiply whole numbers less than 13 in their head need to get a liitle thing called an education

[progal100]

so easy take 9 +9+9+9

[lucille123prettypret]

ummmmmmmmmmmmm i don't get it

[MrsCuttiepie100]

u r a lier i cant even multiply 7*4 with this method

[iicpn]

it works

[maha2shipu]

Hi,,could any one say..how can I multiply ( 7*5=  ) with this method? Fucking method,

[tyguy686]

LOLZORZ ALL U PEOPLE SWEAR

[tyguy686]

LOLZ

[LPMaker5]

OR YOU CAN LEARN HOW TO MULTIPLY IN YOUR HEAD LIKE EVERYONE ELES IN THE FUCKING WORLD

[princessbubbles112]

thank you so much this help me a lot

[c0cksuckerbenji]

BULLSHIT!!!!!! DONT USE THIS METHOD THIS GUY IS A FUCKING DUMB MOTHER FUCKER!!!!!

[doraemon1346]

Best way is to learn to tables upto 50. y r u just doing 1 by 1 digit?

[BobByler]

try any numbers and find similar "easy + quick" math tricks @ maths.kuchnaya.com

[TacoHeros]

Cant you just do 4 x 9...?

wow your making it more complicated

no wonder children sit with their tongues out pointless in kindergarden

[Aldin43]

wtf fuck guys stfu he say's( and the titel say's) MATH IN THE HEAD not in your book or paper so stfu and don't watch the vids if you are not satasfied

[dsb713]

fucking retarded. pointless piece of crap.

[devinces]

it gets efficient as the multiplied numbers get higher. it also works for 3x8. you just need to use every digit in more-than-one-digit numbers.

[romey87]

you a fucking moron. that takes way longer than doing it in your head. get a life. stop making videos. you're an idiot. shave your stache.

[rainblack11]

if you say they fail, you failed cause your brain couldnt understand simple math puzzle.

[urbanaualumni]

3 x 8 doesnt work thanks for wasting our time

[adithecool]

@urbanaualumni It does work!! When doing 3 x 8: you get 10-3 = 7 and 10-8 = 2 so the numbers you get are 7 and 2, subtract across (3-2 or 8-7) and you get "1", then you multiply 7 and 2, 7 x 2 = 14, now 14 is a two digit number so carry first digit over (in this case "1" from 14) and you add one to the first "1" we got from subtraction, answer will be 24!

[rainblack11]

@urbanaualumni it works, math doesnt work in one way, there are many ways but of the same mathod. after the subtraction, you get 1. and when you multiply 7 with 2 you get 14. then you then you add 1 to 14 , you get 24.( the number you subtracted at first is always the number in front, in this case 1 = 10. )

[urbanaualumni]

3 x 8 looser

[RubixKidCube]

woah

[13origamidog37]

Fast? No.

[kakmelah]

I tried 6 X 4 it doesnt work!

[19batista96]

easier if u just use your brain to count.

[PrinceLawless]

i do the 9 like this

4x9

4x10=40

40-4=36

[DrakoV3]

@PrinceLawless Thats easy or you could use the good ol finger trick :).

[LookItsSteveLee]

Not only is this pointless, it's slow as hell.

[SuperGisselle1]

it din't help me at all just kidding it did

[Zapanath]

this is definitely not efficient, i just wasted 2minutes of my life i cannot get back :-(

[perker180]

this technique takes 100 years..

Man the best way is to learn all numbers.. Instead of all crap u doing..

It´s a lot easier when you already know the answers in the head instead of doing ur technique till you die.

[dakilla171]

its just common sense to know how to multiply by 9's.....

[MegaRraahhuull]

Yo thank u so much man you made my life easyer

[LogicalPhallusy]

To multiply 4 x 9, first pick a transcendental number, which we'll call x.

If it rhymes with "fry", then you take the first digit of x to be the ten's digit of your answer and then you take the sum of the next two digits of x to be the one's digit of your answer.

If the transcendental # rhymes with "free", then you take the first digit plus the third for your tens place and the second digit minus the third for the one's place.

ex. x = pi = 3.1415... 4x9 = 36

ex. x = e = 2.7182... 4x9 = 36.

[silentbl00d]

wow this creative and fun!

fascinating!

[InaaA2]

the easiest way is to solve 4 x 9 is to take the first digit and put a 0 behind, 40 - 4 = 36

or 6 x 9 = 60 - 6 = 56

or 3 x 9 = 30 - 3 = 27

there, youre welcome

[EmarosaFan1]

@InaaA2 Fail, 60-6=54

[InaaA2]

@EmarosaFan1 aauch, i failed. everything has a first

[Subatomic1000]

Expert Village is taking form of an online cult, lol.

[snowycloud]

This takes a lot longer than recalling it from memory

[mousedrag]

Easy x9 Multiplication? 09 18 27 36 45 54 63 72 81 90 Yep, First digit = 0 - 9, Second digit = 9 -0

[altstorm118]

4 x 9 is 36.

MEMORY WIN.

[nataliehooi]

sorry but i think i'll stick to timestable

[Jerrickoh]

ill stick to my abacus

[0100111001010111]

This is so stupid and pointless. With x 9 you only take -1 on the number that u want to multiplicate with and you get the first number and then from that u count to 9 to get the second number. 7x9 7 - 1 = 6 6to 9= 3 63 ---- 4x9 4-1 = 3 3to6=6 36

[ninjajesus81]

As a kid I just memorized all the single digit multiplications.

[the1nonlycg]

terrible trick.

[PoXoPoX]

This method is much easier and faster.

4*9=4*10-4*1=36

8*6=8*5+8*1=48

[JamSamwitch3102]

Thanks, ti helps a little...

[DoctorSess]

expertvillage...the village full of idiots!

[dmravi13]

this is some bullshit, u cant do 5 times 4 with this method...

[ShadowSky24]

@dmravi13

I think you can

(-1) 30 ^___^

So if you do 30 - 10 it will be 20

I don't know if I'm right, but it seems like it is :)

[ShadowSky24]

Damn it...

The ^____^ is supposed to show that I mean the -1 and 3...

O'well, hope you get my point :)

[dmravi13]

@ShadowSky24 oh haha sry abt tht :P

[kreuzzers111]

@dmravi13 true.

But if you look at any multiplication challenge with 5 lets say 68 x 5

all you need to do is halve the numbers and add a 0 but take note this only works with EVEN numbers it gets alot more detailed with odd. so 68 x 5 = 340 and there's your answer. if you had 32x5 note how we have an odd number here. you would need to borrow a 1 from the 3 and treat it as a 2 and that makes the 2 now a 12 because we borrowed the 1. so half of 2 is 1 and half of 12 is 6 add the 0 and 32x5=160 :)

[dmravi13]

@kreuzzers111 oh thx dude

[ViktorZed]

also, taking a multiplication question... doing fancy things and then having to multiply (the lower numbers) is pointless.

[ViktorZed]

doesn't work when the bottom numbers multiply to something higher than 10. So this video took a 1 step problem into a 4 step problem that doesn't even work more than half the time

[dudes110]

Hi expert I tried 7x2 and according to your equation it should = 124 and not 14 .can you tell me what went wrong???

[albertotibaldi]

@dudes110

Actually, you did wrong calculations: let's use 10 as "magic number", so you have

10 7 x 2 3 8

This means: (7 - 8) times 10, plus 3 times 8; this is equal to:

-10 + 24 = 14

Expertvillage is right.

[albertotibaldi]

@albertotibaldi

Sorry, this is unclear... I hope you understand :-(

[soulgrease]

wow a 1 step problem in as little as 4 steps! awesome

[101010angle]

what about 4 times 6

[asiandramaddict]

SLOW for single digits FAST for double digits ;)

[adardvd]

nice trick but very slow for small numbers

[cesar95mex]

thanks

[wingegia]

how would you do 2 digit number since it's already higher than 10? do you do them separately? And thank you for the nice tip, i might use it if it works for a lot of numbers.

[chunkiestbacon]

Ok, I think I got i now:

5 x 5 = 25

5 5

5 - 5 = 0 Okay, but It still works. Lets look at another one.

4 x 5 = 20

6 5

5 - 6 = -1

6x5 = 30

Okay 3 + -1 = 2 but how is that method helping you? There is a lot of possibility of error and you still need to learn your tables.

For grade schoolers with ADD or other difficulties, search for "Easy Graphical Multiplication Trick". It takes time, but it its safe. I would use a ruler. I have ADD and wish I knew that method back in first grade.

[TheLantzEmbry]

it easy to associate intimidating subjects with something you dont find intimidating at all so give that a whirl too guys

[techadecka10]

smart i must say smart ummmm smart there i sed it 3 times

[mathieuemi666]

or just memorize them : 9x1 9x2 9x3 9x4 9x5 9x6 9x7 9x8 9x9 Then you'll be able to do 374*872 without error.

[arachlyco]

Well, for some people such as myself, it is good to memorize yes. BUT! You want to grasp the concept.

[thebeastyoyo44]

for u guys this was just a simple example it axactly works for every thing!

[innout4L]

you should just have 4x9 memorized in your head, and not take 4 or 5 steps to get there....its faster to just add 9 together 4 times

[Daniel570C]

I've made an easier method by myself...

8x6=48

to get this answer, we use the base number (10) and multiply it by the second number which is 6, making 60. then We take the base number (10) again and subtract the first number from it (8), which makes 2, then you multiply 2 with the second number (6) which makes 12, then you take the 60 from the solution earlier then subtract 12 from it, boom. 48. the base number can vary if the numbers multiplied are nearer to 100 or 1000.

[stanzukowski]

It's a lot faster just to stack the numbers and multiply like they taught you in 3rd grade. This is just a different way to multiply, it's not friggin' easier.

[Thepozer]

ok you guys aren't looking at this right

we all know 2x4

but maybe something like 92x98? i sure dont know that off my head.

92 x 98 = 90 = 9016

8 x 2= 16

[xXKyrielleW43v3rXx]

Yes, your correct. I did the same thing you did..I followed what he said and got the same answer..This is a perfect way of multiplying..

[gbugss]

This method is good for students that can't memorize their times table starting out. Learning the table is the fastest way, especially if you are taking a timed test.

[ashoka10]

9x4 = 36 and 8x6 = 48. You could do it this way, or just ask any 5th grader.

[anabel0998]

what about if you have 67x20 or 678x698........

[xXKyrielleW43v3rXx]

67x20 my answer..

30x80 4040

100-67=38

100-20=80

80-20=40

67-38=29

Than 80x38=4040

Oh..I dont understand that one. Because I multiplied the regular way... and I got 67x20=1440. That confusing..Lol.

[Jordonvirus]

Short , Sharp , Easy to remember

5/5

=)

[wilbert336]

6x6

4 4

6-4 =2 first answer

4x4=16 now

pu t# six next to first answer wich is 2

and then add 2+1=3 NUMBER TWO BECOMES 3.

IT DOES WORK REMENBER TO ADD IF YOUGET 3 DIGITS

[miewolfram]

memorizing is much much easier. (if the end is x 0, or x 11, or one digit, etc). memorize=you can answer in less than a second, your process=you can answer in,umm... about 5 seconds and above.

memorizing is faster.

[jayse123]

but if you multiply 6x6 it goes to 28?? how weird

[alextwinz]

@jayse123

10-6=4

6-4=2

4x4=16

so i got 216

and thats definitly not right

[xXKyrielleW43v3rXx]

I got 216 too... Weird..

[Xearf]

Or, you could just memorize your basic times tables. Like my fourth grade math tutor forced me to do. *rolls eyes*

[xXKyrielleW43v3rXx]

Thats what I was saying why use this..

[yungbfresh1]

6*7 got a little weird with this method or I might be tripping

[TheProsnoopy]

How do u multiply the numbers that r pass 10?? how do u use this trick does it work the same way?

[TheGenerationNation]

i agree with miley

[lovely2626]

i just want to kiss you. I finally found a solution for my son who is suffering from ADHD. Thank you and GOD Bless

[ClouDLiveZ]

Chuck Norris wouldnt put up with this chit, he would ask this guy to figure up how many kicks that was.

[cin2222]

ok by the time you memorize this you could of just learned the times table ...

[WilliamUzumaki99]

How bout if it's higher than 10?

[tornapart7729]

like 5*8 = 40

first number is 3 second is 10... 30 + 10 =40... or just learn fucking 5*8

[nonulovesit]

like 12*12=144

10-12 = -2

first part: 12-(-2) = 14

second part: (-2)*(-2)=4

so 144

phew! finally..

But guess its jus gud for smaller values only...

[middlevin]

how does chuck norris multiply?

[otkmaster]

His head is a super-computer; how he does it in inexplicable-because he's done as soon as he starts. xD

[storres1234]

i know a trick by 9 nines to do 9 times 8 put ur 8 eight finger down and ur answer is there the tens are at the left side the ones are at the right sides thx

[miley91119]

this is such a bad way to learn your times tables for 4x9 all you have to do is minus 1 from four and then add 6 to equal 9 i learned it so much simpler! ameture!!!!

[xXKyrielleW43v3rXx]

Exactly... Thats the same thing I was saying.. It makes no sense..

[WePrank4Fun]

kinda like wat an abacus does u kno the subtracting from ten does this work on bigger numbers?

[Virginityrocks]

Or you can just remember your multiplication tables to 12.

[chrisofnottingham]

This is fcuking stupid for so many reasons, the first of which is that if you can remember how to do this method correctly then you are more than capable of learning your tables and the last of which is that the final step is a multiplication anyway If you try it with, say, 6x4 you get the final answer by working out 0+4x6 i.e. the same problem!!

What he doesn't say is that this works best for 2 numbers > 5 but even then, just learn your tables rather than this rigmarole.

[bettertvs]

How come this will not work with 4x4

4x4

6 6 -2  12 ?

[chrisofnottingham]

actually, the method does work, it is just a stupid way of working out 4x4. He doesn't make it clear but the first number result is actually 10x the number, that is how he can just stick the next result next to it, thus

4 x 4 = -2

6 ; 6

6 x 6 = 36

-20 + 36 = 16

Way harder than 4x4!

[arabano23]

expertvillage fails...

[tomjackwhu]

this is totally pointless.

[CLouD2343]

So this is how my Servants are doing my mathematical calculations so quickly, Thank you.. now I will give them a pay cut and blame it on the recession. Good..... Good.....

[crisgiray]

Is that the fast multiplication techniques? i think no .

[19Diana85]

This is stupid. It's easier to just memorize the multiplication of one digit numbers.

[CLouD2343]

i will just stick to paying someone to multiply 7 x 2.

[darkblacka]

lmao :D

[hwymadness850]

I am not smarter than a fifth grader hahaha

[asboobsred]

9*9 =81 so easy

1 1

8

[OfficiaDBProductions]

Dude seriously? I am in 5th grade and wtf, I expected like 253x192! Not 4x9... I MEAN SERIOUSLY! 4X9?!

[hellsgate11]

obiously its ment for people who arent able to use the internet yet lol

[MsMadame]

Thank you!

[OhhWaldoBaybee]

wat about 2x7 thou ? i got 621, i know thats not right.. were am i going wrong ?

[OfficiaDBProductions]

2x7 and you got frikken 621?!! Count the O's I write at the bottom, I have 2 rows of 7

ooooooo

ooooooo

Count em? 14

[minakochanzinha]

I tried to do this (dear lord rs), I got 14, see how:

2 x 7

8 3

2-3 or 7-8 = -1 (or -10, you'll see why)

8 x 3 = 24

in the end, 24 - 10 = 14. See? I have no idea how you got 621 hehehe

[OhhWaldoBaybee]

OMFG !!! THAT IS BLOODY GENIUS !!!!! yur the best i struggle soooo badly with maths and this has helped me BIG TIME x

[donniecatalano]

bloody hell  :-(

[beabotelya]

try watching glad2teach. :D its great

[mdiem]

More trouble than it's worth. An interesting way to think about it though.

[SDTricker]

THAT TOOK LONGER!!! Well if the number is huge maybe this would be cool....

[arsimckhoi]

wait so i'm taking a multiplcation problem and breaking it down to another multiplication problem?

[7forthewin7]

dude it doesnt work for anything over 10

try again

[MrTeambarrett]

if its 2 digits make it 20

[adxaen]

1st. this is not hard thats for children

2nd that is harder for imaging

3rd what with ''larger numbers'' i thought you give something like..

2435x 234

[johnnytheprick]

rajatkatyal1 and osnai12345 r correct.

it DOESNT work.  this should b removed.

[sabertooth1980]

It does work. Go back to school and pay attention in class.

[johnnytheprick]

have u tried 7 x 5?

[sabertooth1980]

7 x 5

3 5

Cross subtracting is going to be 2, and 3 times five is 15. 2 is effectively in the tens spot, making it 20. 20 and 15 is 35. I think somebody went over that down below.

[boringguyzz]

since the two bottom numbers are "3" and "5"

so after 7 - 5 = 2 (first number)

later 3x5 = 15

so since its 10 as base number so the answer will be _ _

so write down 2 _

add the 1 to the two and place the 5 in the space making

2+1 5 = 35

[johnnytheprick]

BORINGGGUYZZ,

no mention was made about adding double digits.

[boringguyzz]

yes im aware of that but thats how, go check "glad2teach" he gives a better explanation, ignore the accents

[tomek92pl]

dude u do it the long way, do like this

when 4 * 9 = ?? or just X * 9 = ?? then do X * 10 - X

so if its 4 do 4 x 10 thats 40 - 4 its 36 it works with all numbers. for example 8 * 9 so 8 * 10 is 80 - 8 its 72

[osnai12345]

its not reliable try 7x5 its gonna give you the wrong answer...tell me how good is this technique?

[rijekarastocine]

it works, 7x5, you get 3 and 5, the first digit is 2, which actually represents a 20, the second "digit" is 15, and that is 35

[WestRockefeller]

You people have to be retarded not to find this way easy as hell, I'm terrible at math and I understand it completely. Calm on people figure your shit out.

[X0xoJanexoX0]

i think he kinda made it difficult i cant get it when i saw the number i kno its 36...

[nishcay]

dumbass??

[Ilovelucy19781]

why are you making it so hard?

[menegis]

How is that hard?

[rajatkatyal1]

Can you do 5X5 by this method

[menegis]

5x5 = 025

5 5

yes you can actually. =]

[SuperKurt11]

ZzZzZzZzZzZzZzZzZzZzZzZzZzZzZz­Zz is it finish ZzZzZzZzZzZzZzZzZzZzZzZz

[onelasssttime]

HUH? Yeah, they threw me otta math in tenth grade for bringing down the class curve, but ...er..... duh... even THIS moron could do 9x's 4 no prob....

Wow-- way to complicate something even *I* could previously understand..

It's called memorizing 'times tables' -- you parents or teacher beat you in the face till you get it-- (not so hard, eh)?

[spamato]

The point is to be able to do this with large sums, things outside of the table.

[Exkwsit]

for the any number (1-20) times 9 i now look towards my fingers and toes trick ... it's much faster and i don't have to think so much :) thanks to glad2teach vids.. this one seems, from the comments, not to be working :(

[candygirl1150]

zZzZzZzZzZzZzZzZzZzZzZzzzZzzzz­

[djspitdr]

this mf is tryin 2 confuse you ppl ,. . . . . . . this shit is easy , just try to help youself and doing understade why .

[ajaysinghtube]

VERY WRONG. FUCKING TIME WASTE.

[lklguigllj]

4x9 we assume that 9 is 10 so...

as you come up with the result of 4x10= 40

you have to multiply 4x1= 4

40-4= 36

ur result is 36 :)

[Gornin8]

ROFL

4x5 = -1 so according to him the answer

6 5 =30 to 4x5 is -130 ROFL ROFL ROFL WHAT A NUB CAN'T BELIEVE THIS TURD IS WITH EXPERT VILLLLYY AGE

[sivius]

7x2 is just effed up. Watch:

7x2

3_8

2 minus 3 is -1, 7 minus 8 is -1, so, thus, my answer begins with -1.

Then 3x8 is... 24. So my answer is -124? Awesome.

[sabertooth1980]

Take the Absolute value. Cause if you do on the idea of ... No I see what you are doing.

Move that 24 over one space and go with -10+24. There Now it's working. 14.

[chicoanimedx]

ZzZzZzZzZzZzZzZzZzZzZzZzZzZzZz­ZzZzZzZzZzZzZzZzZzZzZzZzZ.....­.......

[sintje21]

324 

268x

86832

first step 8x4=32 carry 3

second 2x8+6x4+3=43 carry 4

Third 3x8+2x4+2x6+4=48 carry 4

fourth 3x6+2x2+4=26 carry 2

fifth and last 3x2+2=8

answer 86832.

Easy :)