Fast Math Tricks - How to multiply 2 digit numbers up to 100 - the fast way!

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  • เผยแพร่เมื่อ 25 พ.ย. 2011
  • How to multiply 2 digit numbers numbers up to 100 - calculating the fast way!
    Using this method you will be able to multiply any pair of two digit numbers with each other - faster than a calculator! Become a math genius in no time at all using vedic math!
    To see how to multiply 2 and 3 digits using a variation of this trick follow this link: • Fast Math Tricks - mul...
    To donate to the tecmath channel:paypal.me/tecmath
    To support tecmath on Patreon: / tecmath
    To buy tecmath mechandise: teespring.com/stores/tecmath-...

ความคิดเห็น • 6K

  • @tanvirhoque4956
    @tanvirhoque4956 6 ปีที่แล้ว +261

    Some times he just sounds like he is gonna burst into laughter😂

  • @6maniac6metal6
    @6maniac6metal6 2 ปีที่แล้ว +324

    To anyone wondering what to do if your second set of numbers comes out in double digits, you put the left number in the blank space. Then you finish like normal simply adding that number and the one that would usually be in its place, and simply carrying the extra if those number come out over 9.
    Example:
    12 x 15
    1x1=1 and 2x5=10
    So that’ll look like
    110
    Then 1x5 + 2x1 = 7
    Now we take that 7 and add it to the 1 in the middle position and there’s our answer: 180
    And to do big number you can just combine that with what he says in the video.
    Example:
    79x88
    7x8=56 and 9x8= 72
    So we have 5672
    Then of course
    7x8=56 and 9x8=72
    56+72=128
    We then take that and combine it with our previous number
    128
    5672
    Add that how it’s lined up there and you get
    6952, and that’s our answer
    Hopefully this helps someone!

    • @hahah2804
      @hahah2804 ปีที่แล้ว +15

      I dont understand why this guy didnt explain this. Helped a lot

    • @sozukuKrtzLNK
      @sozukuKrtzLNK ปีที่แล้ว +9

      How do you combine 128 and 5672?

    • @riansevilla8845
      @riansevilla8845 ปีที่แล้ว +6

      @@sozukuKrtzLNK he first add the 67 and 28 then the remaining 1 is add to 5 which makes it 6 95 2

    • @williamporter8463
      @williamporter8463 ปีที่แล้ว +8

      THANK YOU FOR THIS. Not quite the way the video explains it. I was multiplying 29 × 47 and the video method wasn't working. This method works. Thanks!

    • @Msmaxine130
      @Msmaxine130 ปีที่แล้ว +3

      Yes!! Thank you! I literally just asked this question … then saw your post. 😆 Thank you!

  • @ritabrebre
    @ritabrebre 4 ปีที่แล้ว +1497

    bruh I just graduated highschool and I'm only learning this now lmfao

  • @jimc12
    @jimc12 4 ปีที่แล้ว +238

    I'm 38 years old and not very good at math. I blame myself out of anyone for this. I've watched a few of your videos so far and have learned more in regards to math than the past 36 years of my education. You are making math fun for me. The only thing that is holding me back now is mental math and doing these in my head. I'm working on that though. Thank you!

    • @DavidG-kv8wm
      @DavidG-kv8wm 2 ปีที่แล้ว +15

      Born and raised in the United States 🇺🇸 i love my country. But im 56 and now learning a way better a quicker way from you has left me like WTF! When it comes to our educational system. And very grateful and appreciative to you sir. Thank you very much

    • @Bookish1995
      @Bookish1995 2 ปีที่แล้ว +3

      @Otto von Bismarck not funny, try again

    • @doge2889
      @doge2889 2 ปีที่แล้ว

      good all you need to know is that the earth is flat

    • @hopehouston5732
      @hopehouston5732 2 ปีที่แล้ว

      Right but as long as you have scratch paper is all that matters we all put our jeans on,one leg at a time .. if you can do it with no calculator you are the bomb..lol

    • @Migixkem
      @Migixkem ปีที่แล้ว +3

      School system was always nothing in the first place

  • @sayakdiptapaul
    @sayakdiptapaul 4 ปีที่แล้ว +433

    I hope its not too late to post a comment,
    sir, you cant imagine how far your lessons are reaching and how many minds are they changing , just for you.
    thank you, from the bottom of my heart.

    • @neena_nalathra4036
      @neena_nalathra4036 4 ปีที่แล้ว +3

      same

    • @apriltwenty4945
      @apriltwenty4945 4 ปีที่แล้ว +9

      Agree I am an accountant an learning this now. 🙏🏽

    • @1polyron1
      @1polyron1 4 ปีที่แล้ว +4

      @@apriltwenty4945 Do you like accounting?

    • @ZauligChan
      @ZauligChan 3 ปีที่แล้ว

      Thank you from Florida

    • @Appelsientje284
      @Appelsientje284 3 ปีที่แล้ว

      I agree

  • @MrJtheviper
    @MrJtheviper 8 ปีที่แล้ว +535

    I am in school and the kids in my class look at me like i was from a diffrent planet when i said the answers correctly over and over again.

    • @LearnMathsFree
      @LearnMathsFree 8 ปีที่แล้ว +3

      +Jtheviper Cool!

    • @sunilpatel4902
      @sunilpatel4902 7 ปีที่แล้ว +2

      Jtheviper me to

    • @__-vj6fu
      @__-vj6fu 6 ปีที่แล้ว +2

      Jtheviper my teacher called me to go and solve the question at the white board and the class looked at me like "ugh it's this bitches turn" (litter ly) you guys get that pun?(it's pretty bad what am I doing XD)

    • @yousufhassan6962
      @yousufhassan6962 6 ปีที่แล้ว

      Turbulent

    • @dcgarg2895
      @dcgarg2895 6 ปีที่แล้ว +1

      Is to fast ta simple multiplication nal hi ho janda hai

  • @stevenhaskell9025
    @stevenhaskell9025 4 ปีที่แล้ว +194

    This man has taught me more than my school

    • @rahuimaru8983
      @rahuimaru8983 4 ปีที่แล้ว +7

      🤣🤣 same I'm like wtf was my teachers even teaching me

    • @user-ps8ip1bx9w
      @user-ps8ip1bx9w 4 ปีที่แล้ว

      Same

    • @nutcracker2916
      @nutcracker2916 4 ปีที่แล้ว

      Me too. Love your profile pic.

    • @Study-ez6cf
      @Study-ez6cf 4 ปีที่แล้ว

      Me too😂

    • @Dandontlie
      @Dandontlie 4 ปีที่แล้ว

      seriously?? last time im in school was 4 years ago now im 17 and im suprised

  • @BaroShirts
    @BaroShirts 4 ปีที่แล้ว +277

    Are the math lessons from 2011 helping?
    “Yes”

    • @ivickyvlog352
      @ivickyvlog352 4 ปีที่แล้ว

      MiguelGaming ReadyChannel lol

    • @kevwegilmore
      @kevwegilmore 4 ปีที่แล้ว +1

      Wow this was made in the year i was 1 and i am 9 right now wowwww this is old and yes it helps🙂

    • @luipirronecook8474
      @luipirronecook8474 4 ปีที่แล้ว +7

      i keep getting that AD

    • @dhennied
      @dhennied 3 ปีที่แล้ว

      Ulol

    • @klimankhmeron7636
      @klimankhmeron7636 3 ปีที่แล้ว +3

      Some of the lessons still helping from 2000 B.C.

  • @JoseGonzalez-ct5vz
    @JoseGonzalez-ct5vz 9 ปีที่แล้ว +22

    If you got 4 digits after the two first calculations, the use of the "_" must be avoided. e.g. 75x64
    7x6=42 and 5x4=20, then you got 4220.
    (7x4)+(5X6)=58
    4220
    58
    4800

    • @aliatabassum6126
      @aliatabassum6126 6 ปีที่แล้ว +1

      Jose' Gonzalez, thank you for explaining. I am coping your answer to the people who have disagrees.

    • @mariafe7050
      @mariafe7050 4 ปีที่แล้ว

      You mean if you have 2 digits from the products of the ones places

    • @mariafe7050
      @mariafe7050 4 ปีที่แล้ว +1

      For example: 25x25
      2x2=4 and 5x5=25 We have 2 digits in this product so don't use the _
      425
      (2x5)+(5x2)=20
      425
      20
      625
      The answer is 625. If you used the _ it would look like this
      2x2=4 and 5x5=25
      4_25
      (2x5)+(5x2)=20
      4_25
      20
      6025
      There would be an extra digit which we don't want.

    • @Theismadsen.
      @Theismadsen. 2 ปีที่แล้ว +1

      @@mariafe7050 how would you solve 57 x 17?

    • @julienielsen4462
      @julienielsen4462 2 ปีที่แล้ว +2

      @@Theismadsen. I figured it out if you get a double number on the last part of the number use that first digit to add to the middle.

  • @erinn828
    @erinn828 2 ปีที่แล้ว +15

    Oooohhh, this is FOIL method (First, Outer, Inner, Last). I did not realize that cause you explained it so well, and made it look so easy. Thank you for this sir!

  • @lekronss
    @lekronss ปีที่แล้ว +14

    I was expecting this to be super complicated, but after watching 5 minutes of this video, I could solve each problem in around 10-15 seconds. I'm super happy right now.

    • @zadinzadin
      @zadinzadin ปีที่แล้ว

      cool

    • @AIBuoy134
      @AIBuoy134 ปีที่แล้ว

      Bruh I solve it in 5 seconds using normal method

    • @NiqueloAncets
      @NiqueloAncets ปีที่แล้ว

      @@AIBuoy134 Good for you, but this is for people who can’t mentally calculate fast

  • @dedricblowe5574
    @dedricblowe5574 4 ปีที่แล้ว +5

    Where the heck were you when I was in high school... I’ve watched 4 of your videos and I see teachers don’t teach these because once you get it... you don’t need anything else... you just became amazing.

  • @user-hd6xc1xn9d
    @user-hd6xc1xn9d 7 ปีที่แล้ว +190

    Tecmath,
    I am a viewer and I love your math videos! One thing I hate though, is how you never explain it. Other kids at my school ask " Wow, you're good! How do you do the strategy?". I tell them the strategy. BUT, they wanna know WHY IT WORKS! So please explain why it works if it is less than somewhere around 10 minutes to explain. PLEASE like this so he can SEE IT!
    - A Student In Math

    • @jozsefsalagvardi7694
      @jozsefsalagvardi7694 5 ปีที่แล้ว +16

      If you want to multiply two numbers between 9 and 100 with this method you have to know that what means if the number is on the first or the second place (and etc.) in the ten numerical systems.

      For example:
      12 X 34 equal / can be written as (10 x 1 + 2) X (10x3 + 4),
      or generally (10a + b) X (10c + d).
      Let us multiply these numbers: (10 x 1 + 2) X (10x3 + 4)
      it will be (10x1X10x3)+(10x1X4)+(2X10x3)+(2X4),
      or generally (10a + b) X (10c + d) = 10aX10c + ( bX10c + 10aXd) + bd.
      …. as _X 100 + _X 10 + ... _X 1
      The result has a part as 100's from the 10aX10c, has two parts as 10's from the bX10c plus the 10aXd (as sum of cross-multiples) and has one as 1's from the bXd values.
      The result will be 3 or 4 digits only.
      I hope that this helps.

    • @Doc_Bavarius
      @Doc_Bavarius 5 ปีที่แล้ว +4

      It makes use of basic algebra if a x b = c is the question and a and b are any 2 digit numbers. Then a = the sum of it's parts eg 10s + 1s.
      Eg if a = 25 it is the same as (20+5)
      In algebra if (d+e)×(f+g) = df+ef+eg+ef
      Eg 24×53 = (20+4)×(50+3)
      =20×50 + 4×50 + 3×20 + 4×3
      Notice 20×50 is the first part you put down ie the biggest number. 1000. But in order to make addition easier you leave the last 2 units blank therefore 10_ _. Add in the units 3x4=12. And you get 1012. But you still need to add 20x3 and 50x4=60 and 200 or 260. Lose the zero and you have 26_. Line them up.
      10_ _
      26_
      12
      1272.
      That's what you do to prove it. But you take shortcuts in your head to get to the answer. Condensing and compressing it to be easy to understand.

    • @dietrevich
      @dietrevich 5 ปีที่แล้ว +8

      Hi!, I know it's a late response but anyway. The reason it works its because it's an application of the distributive law. So for example 22x32 it's the same as (20+2) x (30+2). He is using it out in a summarized way.

    • @khajaraheemkhan8509
      @khajaraheemkhan8509 5 ปีที่แล้ว +2

      Bro what about 46 into 59

    • @williambarnes1397
      @williambarnes1397 5 ปีที่แล้ว +4

      @@Doc_Bavarius Not sure if you can edit your otherwise excellent comment but I think you'll find (d+e)×(f+g) = df+ef+dg+eg

  • @bellakhut5579
    @bellakhut5579 6 ปีที่แล้ว +315

    I learnt this in Primary School and the teacher called it the “ Rainbow “ method. ( P.s. you do the best math videos )

    • @beverlyfrancis8433
      @beverlyfrancis8433 4 ปีที่แล้ว

      Ok.

    • @noxy_xoxo
      @noxy_xoxo 4 ปีที่แล้ว +1

      Lol me too 😂

    • @carolynroberson8407
      @carolynroberson8407 4 ปีที่แล้ว +10

      No one ever taught me this in school. Love your videos.

    • @99oildrops
      @99oildrops 4 ปีที่แล้ว +6

      @@carolynroberson8407 I wish I knew this. I was terrible at math. lol

    • @petslife2411
      @petslife2411 3 ปีที่แล้ว

      Nope he is the worst teacher

  • @helloareyouokay9842
    @helloareyouokay9842 3 ปีที่แล้ว +215

    Dude why tf doesn’t my school teach this 😭😂

    • @bustergundo516
      @bustergundo516 3 ปีที่แล้ว +33

      Because they want you to struggle and get headaches.

    • @DARKNESS-vm2og
      @DARKNESS-vm2og 3 ปีที่แล้ว

      @@bustergundo516 ikr

    • @chglubb
      @chglubb 3 ปีที่แล้ว +2

      I don't know what you have learned in school to solve this - but I have learned a way which is equally fast and which you can easily transfer to numbers with 3 or more digits...
      By the way: doesn't everybody use a calculator to solve this?

    • @khalidsheikh1581
      @khalidsheikh1581 3 ปีที่แล้ว

      @@chglubb booo

    • @polarized8150
      @polarized8150 3 ปีที่แล้ว

      @@chglubb well you have a nice school ig cause almost every school doesent teach this

  • @HomeOnlineMathsEducation
    @HomeOnlineMathsEducation 2 ปีที่แล้ว +17

    I got 704
    3213
    and 4182 in less than 2 minutes and I solved them mentally....☺️
    Thanks a lot for this method 😄

  • @davidlewis1680
    @davidlewis1680 3 ปีที่แล้ว +23

    I suffer from maths dyslexia and anything to do with maths make me come out in a sweat . You sir are a great teacher , love these maths tutorials. Thank you so much . I’ve subscribed

    • @djamilac9556
      @djamilac9556 2 ปีที่แล้ว +1

      I used to leave my math exam paper blank. I could not understand a thing.

    • @user-tt8wf6cr3g
      @user-tt8wf6cr3g 2 ปีที่แล้ว

      @@djamilac9556 lol

  • @elise_-xq7pw
    @elise_-xq7pw 4 ปีที่แล้ว +39

    This helps me a lot now I can spend less time trying to figure it out.

    • @insideful8529
      @insideful8529 3 ปีที่แล้ว

      @Adib Farhan 480000

    • @somxr_738
      @somxr_738 3 ปีที่แล้ว +2

      chiaroschurros it’s index, not multiplication. multiplication sign is *

  • @nakulchauhan8776
    @nakulchauhan8776 5 หลายเดือนก่อน +1

    This is absolutely the most helpful thing ive seen being in highschool.

  • @christopherwilson6527
    @christopherwilson6527 4 ปีที่แล้ว +3

    Why are we not teaching this in school?! Ive now gone from not knowing my times tables to multiplying double numbers! Awesome thanks!

  • @pratimamehta2613
    @pratimamehta2613 8 ปีที่แล้ว +113

    this video is really really helpful this time i got 99.7 in maths because of my fast multiplication compared to last time when i got 80.5

    • @LearnMathsFree
      @LearnMathsFree 8 ปีที่แล้ว +1

      +Pratima Mehta Congrats!

    • @ZingZangOliver
      @ZingZangOliver 8 ปีที่แล้ว +3

      Interesting but how do you get a 97.7?

    • @K9sual
      @K9sual 8 ปีที่แล้ว +1

      +ZingZang Oliver I had a 103% called extra credit and paying attention

    • @ZingZangOliver
      @ZingZangOliver 8 ปีที่แล้ว +3

      +Doom Patato Oh, i was just a little confused because in my school we dont do extra credit.

    • @aileenalien-ji4sg
      @aileenalien-ji4sg 8 ปีที่แล้ว +2

      How did u get a 99.7? My teacher saids it's impossible to get a 99

  • @AmyJessicaW
    @AmyJessicaW 9 ปีที่แล้ว +12

    You, solely, are going to get me passed my ITT Professional Numeracy Skills test! For that, I thank you!!!!

    • @zaki_vlogs1
      @zaki_vlogs1 หลายเดือนก่อน

      So did you passed?

  • @gazclint1
    @gazclint1 4 ปีที่แล้ว +5

    Wish I’d have had you as my maths teacher when I was at school

  • @broisthatdadog8983
    @broisthatdadog8983 3 ปีที่แล้ว +5

    This man deserves much more than 1 million sub

  • @anzalh8339
    @anzalh8339 8 ปีที่แล้ว +5

    Your just an amazing teacher who inspires confidence and makes learning maths FUN!

  • @sharpgames2062
    @sharpgames2062 5 ปีที่แล้ว +12

    I would have failed grades without the internet THANK YOU!

  • @raunichey
    @raunichey 2 ปีที่แล้ว +2

    I just got a job that involves a LOT of mental multiplication and your videos are saving my LIFE! THANK YOU! :D :D

    • @paulhemming5376
      @paulhemming5376 ปีที่แล้ว

      Which job requires mental multiplication a lot

  • @regonite1495
    @regonite1495 4 ปีที่แล้ว +38

    "Big brain time"

    • @naokimc
      @naokimc 3 ปีที่แล้ว

      "it's" BIG BRAIN time

  • @herrkonghmongvue8108
    @herrkonghmongvue8108 5 ปีที่แล้ว +21

    Love this guy he's getting me work up about math again

  • @julianasantiago
    @julianasantiago 7 ปีที่แล้ว +28

    TecMath this is awesome!!!!! I'm feeling like a genius! And I can listen to your accent all day! This is exciting

    • @bambispoon4305
      @bambispoon4305 2 ปีที่แล้ว

      What happens when the units part of the answer is 10 or over? Lets say it’s 12 . Do you write down 2 in the units and then add the 1 to the tens column?

    • @Amxxh1
      @Amxxh1 2 ปีที่แล้ว

      @@bambispoon4305 what?

  • @theforgetfulnugget8971
    @theforgetfulnugget8971 4 ปีที่แล้ว +18

    I swear this men sounds like he has so much confidence in me, and i don't even know him.

  • @warrenrgarey
    @warrenrgarey ปีที่แล้ว +7

    I love these videos. Thank you for sharing how to do seemingly complicated sums, easily.
    THE QUESTION REMAINS, WHY WERE WE NEVER TAUGHT (AND STILL NOT TAUGHT) TO DO MATHS THIS WAY IN SCHOOL?

  • @bstandsforbuilding5567
    @bstandsforbuilding5567 7 ปีที่แล้ว +313

    40% of the comments are wise guys trying to prove this method wrong because they don't know how to use it properly.

  • @sadidatheanti413
    @sadidatheanti413 8 ปีที่แล้ว +3

    Thanks for the tutorial mate! This helps a lot!

  • @tyriccobene
    @tyriccobene 2 ปีที่แล้ว +2

    Brilliantly and clearly said, additional points for brevity. Great video.

  • @III_BLASTER_III
    @III_BLASTER_III 4 ปีที่แล้ว +3

    You're a great instructor. Thanks!

  • @DormFoodies
    @DormFoodies 9 ปีที่แล้ว +8

    This is Amazing! Thank You Very Much!

  • @teklitbrhane8652
    @teklitbrhane8652 5 ปีที่แล้ว +7

    thank you so much. I have learned everything for your video the system of the math.

  • @abeastgaming9600
    @abeastgaming9600 4 ปีที่แล้ว +2

    This is what my 3rd grade teacher took 1 year to teach and you taught me in 6 min 26 seconds, bravo

  • @alihaider51006
    @alihaider51006 4 ปีที่แล้ว +13

    Thanks brother for helping in such an easy and interesting way , it really made me tension free for my child's math multiplication problems that he has to solve without working, thanks again👍

    • @doge2889
      @doge2889 2 ปีที่แล้ว

      L+ratio+thumbs+nothumbs+nomilk+toomuchbananas+Quadraticformula+bingbong+bin7gchilling+bing

    • @leydicanche6240
      @leydicanche6240 7 หลายเดือนก่อน

      😊😊

  • @prasannaanna390
    @prasannaanna390 5 ปีที่แล้ว +11

    I'm a banking student it is really helpful

  • @tivmego
    @tivmego 9 ปีที่แล้ว +56

    Hello, does anyone know how one could solve 127 x 23 using this method? The trick only works with 2 2-digit numbers. How about the multiplication between 1 3-digit numbers and 1 2-digit numbers ? Has he taught any trick regarding this?

    • @TofuFiesta
      @TofuFiesta 9 ปีที่แล้ว +17

      I'd say just first do it with the 27*23 and later multiply 23 with 100 and add it up.

    • @erggish
      @erggish 9 ปีที่แล้ว +3

      tivmego It's difficult to explain this method of his in words or maths, but I'll give it a try.
      Suppose that XY is a number (eg for X=2, Y=3 this number will be 23)
      and WZP is another number (eg for W=1, Z=2, P=7 this number will be 127)
      So X,Y,W,Z,P are just digits.
      Now take and write:
      (XY) * (WZP) = (X0+Y) * (WZ0 + P) = (WZ*X) [00] + (X*P +WZ * Y)[0] + P*Y
      where I put the zeroes in [ ] because what he does is write for each zero-brackets an empty slot: _ _ _
      in the 1st slot he puts the number next to [00] : WZ *X (the first numbers of your choice)
      in the 2nd slot he puts the number next to [0] : X*P + WZ *Y (the crossings)
      In the 3rd slot he puts the numbers without zeros (the two last digits multiplication).
      That's his idea... and it is not based in separating the number into the 1st and the 2nd digit, but separating the last digit from the rest of your number.
      So let's go to your example:
      127 x 23 = (12 x 2 ) [00] + (2 x 7 + 3 x 12) [0] + (3 x 7)
      now I will write the numbers in the slots , for that I'll use the bracket for the slots:
      [ 12 x 2 ] [ 2 x 7 + 3 x 12 ] [ 3 x 7 ]
      [24] [ 50 ] [21]
      Now the 3rd slot is larger than 10, so the 2 is going to be added to the middle slot: [24] [52] [1]
      The middle slot is larger than 10, so the 5 will be added to the 1st slot:
      [29][2][1]
      the answer is so: 2921

    • @MF-ur2xu
      @MF-ur2xu 9 ปีที่แล้ว

      tivmego You could use his 3-digit trick and make 23 become 023.

    • @MF-ur2xu
      @MF-ur2xu 9 ปีที่แล้ว

      or use the lattice multiplication trick.

    • @nonhlanhlakhoza6288
      @nonhlanhlakhoza6288 8 ปีที่แล้ว +1

      tivmego

  • @treebytheseaside
    @treebytheseaside ปีที่แล้ว +2

    Thanks so much for this video. I have been wondering how to do these questions and now I know!

  • @henry8558
    @henry8558 ปีที่แล้ว +28

    This is how teachers should had teach me in school 😭

    • @elvisodell1376
      @elvisodell1376 ปีที่แล้ว

      Hahahah

    • @kaelyneades5789
      @kaelyneades5789 ปีที่แล้ว +1

      Facts

    • @LesserMoffHootkins
      @LesserMoffHootkins ปีที่แล้ว

      But they couldn’t, because they were ignorant

    • @JohnDee633
      @JohnDee633 ปีที่แล้ว +1

      The problem is they come up with a certain way of showing work. And you’re forced to do it their way. It’s not about the correct answer, it’s about following rules.
      Then later in life you have to teach yourself to work smarter.

  • @aatishom9848
    @aatishom9848 6 ปีที่แล้ว +4

    I love this video very much!!!,
    You have made multiplication simple to me!!! THANK YOU :)

  • @KX36
    @KX36 8 ปีที่แล้ว +23

    oh my god where were you when I was in school!

    • @archanasingh.2511
      @archanasingh.2511 7 ปีที่แล้ว +2

      Yeah, I use the same technique.

    • @olatundeakindeleroberts5369
      @olatundeakindeleroberts5369 3 ปีที่แล้ว

      It's doesn't work with 24*21

    • @BOLT264
      @BOLT264 3 ปีที่แล้ว

      @@olatundeakindeleroberts5369 it does

    • @BOLT264
      @BOLT264 3 ปีที่แล้ว

      @@olatundeakindeleroberts5369 504

  • @ThePiMan0903
    @ThePiMan0903 ปีที่แล้ว +1

    Thanks for these tricks tecmath!

  • @carlsononly
    @carlsononly 2 ปีที่แล้ว +10

    Just one thing. The results of the second numbers being multiplied are single integers. I have practices where the product of the second numbers are two integers. I found that if you add the first digit of the product from the second integers to the sum of the products from the first and second integers (consecutively) it's correct.

    • @undercoveragent9889
      @undercoveragent9889 2 ปีที่แล้ว +1

      Well, taking 26 x 86 as an example, the first stage of the calculation, (6 x 6) yields a result of 36. So, instead of a '_6' as shown in this video, you would have a '36' there instead. The next stage, (2 x 8) yields '16' giving us an intermediate result of '1636', right? In stage 3, ((2 x 6) + (6 x 8)) yields a value of '60; add that into the '1636' as demonstrated in this video and you are left with '2236' and the correct answer. :)

    • @twesiimemaurice8846
      @twesiimemaurice8846 2 ปีที่แล้ว +1

      @@undercoveragent9889 try 94 x 36. It gives a wrong answer

    • @kb8026
      @kb8026 ปีที่แล้ว

      @@twesiimemaurice8846 yea this track doesn’t work there’s actually a lot of answers that don’t work with the equation.

    • @user-hl4hf8yz1k
      @user-hl4hf8yz1k ปีที่แล้ว

      How is it wrong?

  • @dennisburke199
    @dennisburke199 5 ปีที่แล้ว +17

    Thank you for helping me refreshing my math skills. I greatly appreciate it. Sure wish I had a math teacher like you growing up. Chances are I wouldn't have despised math as much. Thanks again!

  • @manishapersaud6366
    @manishapersaud6366 8 ปีที่แล้ว +3

    Awesome !!! you've made calculation become easier now thanks alot :)

  • @lifestyles2482
    @lifestyles2482 ปีที่แล้ว

    I’ve always had a really good memory in mind for math but this would’ve made me look pretty incredible if I had mastered more of these as a kid, I need some shortcuts but there’s so many do you can learn it’s pretty cool! Never too old to learn.

  • @akhtersimasharmin6446
    @akhtersimasharmin6446 5 หลายเดือนก่อน

    Finallyyy i got the reallllll math teacher that actually helping students but not shouting at them for not doing correctly. School teachers should watch these vdo so that they could teach students this wayyyy...

  • @zeefixdealwith-itgames480
    @zeefixdealwith-itgames480 7 ปีที่แล้ว +5

    YOU HELPED ME DO MY HOMEWORK BECAUSE WHAT THEY DO IS SOME COMPLICATED CARYING OVER like 10 times
    u saved my time

  • @Dave77
    @Dave77 7 ปีที่แล้ว +3

    This was so helpfull for me! Thank you so much for this teach! I'm not great at calculating... usually i calculate with the phone, but that is very good! Big like for you! 😊

  • @NaMatwo2
    @NaMatwo2 4 ปีที่แล้ว +2

    Never heard of this 😱 luv this!

  • @bigbondydudegaming4005
    @bigbondydudegaming4005 ปีที่แล้ว +1

    You are so helpful because I don’t no how to do the column method for 2 digit by 2 digits so that’s really helped me out. Thanks😃

  • @HomeOnlineMathsEducation
    @HomeOnlineMathsEducation 2 ปีที่แล้ว +5

    I am happy to know this easy method Sir.....☺️ Thanks so much for the tutorial 🙏

  • @quantumking1724
    @quantumking1724 6 ปีที่แล้ว +6

    The reverse FOIL process, that's genius!

  • @juliepearlcabingas2506
    @juliepearlcabingas2506 3 ปีที่แล้ว +2

    I love your topic sir. Thank you for sharing your knowledge to us. 🙂

  • @amernoori4157
    @amernoori4157 ปีที่แล้ว +2

    Why aren't there more people like you on Earth!

  • @stvivianne8820
    @stvivianne8820 4 ปีที่แล้ว +3

    Your voice was so good had to watch it again.

  • @AhnastasiaRose
    @AhnastasiaRose 5 ปีที่แล้ว +7

    You sounded so excited solving the third math problem 😂 Even I started to get excited and I don't even know why, I hate math 😂

  • @lawrencebolt3540
    @lawrencebolt3540 2 ปีที่แล้ว

    I'm able to do these in my head with your method. Thank you,

  • @obi-wankenobi9088
    @obi-wankenobi9088 4 ปีที่แล้ว +1

    You... good sir... have earned a subscriber and a LOT of likes because I’m probably might watch all you’re videos since there really helpful

  • @fastsciencecrafts
    @fastsciencecrafts 3 ปีที่แล้ว +5

    So what happens when you pick numbers for witch the product of their last digits is greater than 10?

    • @rakibhasan-hd9rc
      @rakibhasan-hd9rc 3 ปีที่แล้ว

      Was searching for this comment bruhh

    • @yuvrajbhati4023
      @yuvrajbhati4023 3 ปีที่แล้ว

      BRO SOMEONE SAID IT
      DO 44 X 57

    • @sonyaeames7047
      @sonyaeames7047 2 ปีที่แล้ว

      @@yuvrajbhati4023 4*5=20. 4*7=28. So that is 2028 add 4*7=28. 5*4=20. 28+20=48. So 2028+480=2508 not sure why you add 480 and not 48 but it works!

  • @DestinyQx
    @DestinyQx 10 ปีที่แล้ว +7

    (51)(63) = (50 + 1)(60 + 3)
    = 50*60 + 1*3 + 50*3 + 1*60
    = 3000 + 3 + 150 + 60
    = 3003 + 210
    = 3213
    Open Letter to Educational Systems: teach kids how to do this fast math trick.. the reason why it works is because of distribution.. something that is fundamental for high school algebra.. teaching 4th graders how to multiple like this.. will let them naturally understand how to distribute later.. and we can leave FOIL to mean what it originally meant as a verb (to prevent from succeeding)

  • @rezvlt9285
    @rezvlt9285 4 ปีที่แล้ว +2

    This guy is the Bob Ross of Math.

  • @Archanaa20..........
    @Archanaa20.......... ปีที่แล้ว +2

    I learnt this right in time yayy. Thank you so much sir, I really like your teaching style...

  • @gooloohabadubudu5838
    @gooloohabadubudu5838 3 ปีที่แล้ว +31

    Thank you so much for teaching and explaining things so thoroughly! I just showed off to my class and they were really impressed. I then taught them everything I learned form you, and it helped our class win the title of Best Class in Mathematics! Now I just need to remember these methods and not mix them up with all the other concepts u have taught 😂
    Edit: By the way, I'm now like literally top 3 best in mental math and problem sum solvers thanks to you! Also lots of thanks to my math teacher in school, she teaches and explains things that can be understood almost immediately by the whole class; like you!

  • @imaneard123haha4
    @imaneard123haha4 7 ปีที่แล้ว +3

    +Tecmath, thanks for the multiplication method
    It really helped me,
    I really appreciate this method
    Thank you so much

  • @Brandon_Lee83
    @Brandon_Lee83 2 ปีที่แล้ว +1

    Thank you for posting this video, totally awesome! 😁🤘

  • @sonofkratos6
    @sonofkratos6 2 ปีที่แล้ว

    Thank you for the video. I was doing this and realized that it is faster to do the equation backwards. Starting from the right side of the equation.

  • @KhubaibKamran
    @KhubaibKamran 2 ปีที่แล้ว +4

    If anyone else is wondering:
    For values like 66 and 44,
    When you do this method, you get the answer
    28824, right?
    So what you do here, is that add the last '2' to the next digit, which would give 8+2= 10, then add that one to the next digit, you'd get 2904, which is the correct answer. Hope this helps you ;)

    • @luth.1
      @luth.1 2 ปีที่แล้ว +1

      thanks so much for this bro

    • @ibrahimkuttypp2837
      @ibrahimkuttypp2837 ปีที่แล้ว

      25*45 pls do this using the above method

  • @pepshaven6520
    @pepshaven6520 4 ปีที่แล้ว +4

    I've been testing myself with these to lock it down in my mind. I tried a tricky one - 59 x 33 where we have to employ a trick you didn't show and I'm delighted to find I actually got it right! Yay! I can do math!

    • @blenderanim8or
      @blenderanim8or 4 ปีที่แล้ว +1

      Peps Haven - What was the trick? I tried 83X24 and did not come up with the right answer.

    • @pepshaven6520
      @pepshaven6520 4 ปีที่แล้ว +3

      @@blenderanim8or It's a little hard to explain but 15 x 33 works out to 15 _ 27 at first step. Second step it's 15 + 27 = 42. Third step is where you have to add. So...first number is 1, Second number is 5 + 4 (from the 42) making 9. Third number is 2 (plus the 2 from the 27) making 4. Fourth number is 7. Full number is 1947.
      In this video, he doesn't talk about adding carry over's at all. See if this makes it easier.
      83 x 24

      First step
      8 x 2 = 16
      3 * 4 = 12
      16 ___ 12
      Second step
      8 x 4 = 32
      3 x 2 = 6
      32 + 6 = 38
      Third step - where you add carry overs.
      Start with 1 6 __(38)__ 1 2
      First digit 1
      Second digit 6 + 3 (carried over from the 38) = 9
      Third digit 8 + 1 (carried over from the 12) = 9
      Fourth digit 2
      Total: 1992

    • @blenderanim8or
      @blenderanim8or 4 ปีที่แล้ว +1

      Peps Haven That helped a lot! Thank you, I knew there was something I was missing there. And thank you for being gracious and not snarky like so many on this.

    • @pepshaven6520
      @pepshaven6520 4 ปีที่แล้ว

      @@blenderanim8or You're welcome. It took me a while to figure out what I was doing wrong too until I twigged. :)

    • @nilupilu
      @nilupilu 2 ปีที่แล้ว +1

      @@pepshaven6520 thanks so much, i will mention u here

  • @ishantripathi9707
    @ishantripathi9707 ปีที่แล้ว

    Amazing! Just amazing mate! I didn't know there was a trick for this! Cheers!

  • @SwAT36
    @SwAT36 3 ปีที่แล้ว

    OMG! I was searching for this video whole day thanks you saved my life!

  • @kowshikkarmagam8371
    @kowshikkarmagam8371 10 ปีที่แล้ว +3

    THANKS A LOT. IT HELPS ME A LOT

  • @evanclemons8658
    @evanclemons8658 5 ปีที่แล้ว +18

    "I'll rub that out"

  • @z0eee_416
    @z0eee_416 3 ปีที่แล้ว

    Thanks for this! You make me love math.

  • @Sophia-vb5jf
    @Sophia-vb5jf 4 ปีที่แล้ว +2

    omg, all my life ive been using the long way. BUT THANK YOU FOR THIS

  • @SyedHannanZakir
    @SyedHannanZakir 10 ปีที่แล้ว +5


    We cannot use the underscore all the times.
    For example if we get the multiplication of both first two and last two numbers greater than or equal to 10 (As in case of 64*36, we get 6*3=18 and 4*6=24), we will write just four digits not the underscore (1824 not 18_24).
    Also if the first number is less than 10 and second one is greater than or equal to 10 (As in case of 34*23, we get 3*2=6 and 4*3=12), we will write just three digits not the underscore (612 not 6_12).
    I suggest a few rules for the general equation: ab*cd (e.g; 31*21)
    First Step [Let (a*c and b*d) = A]:
    1) Don't use underscore:
    i) if you get 4 digit number after first operation:
    "a*c>9 and b*d>9" (e.g for 64*36, 1824)
    ii) if you get first number less then 10 and second greater than equal to 10:
    "a*c

    • @catwithaknife198
      @catwithaknife198 6 ปีที่แล้ว

      Does it matter if AC is > or < 10?

    • @catwithaknife198
      @catwithaknife198 6 ปีที่แล้ว

      The last 2 calculations should be multiplyed by 10 before they are added.

    • @catwithaknife198
      @catwithaknife198 6 ปีที่แล้ว

      A= 1824
      B= A10
      A+B= 20064 =C
      What is C?

    • @salumtummundi9462
      @salumtummundi9462 5 ปีที่แล้ว

      Just modify it bruh and u carry
      FIRST thing you carry
      U trying to look smart but you aint
      And mpdifiy it on your own if you don't like his

  • @meta4282
    @meta4282 8 ปีที่แล้ว +19

    To multiply 3 digits numbers this way Eg: 127 x 23 - use the exact method as in video, leaving out the (100 value) of 127, so work out firstly 27 x 23 = 621 then add your second number (23) with 00 on the end to this: 621 add 23(00) like below.
    621
    2300 (second number in equation gets 00 behind) ------please read on - it gets exciting!!!
    ----------
    2921
    or
    156 x 42 (drop the 1)
    = 56 x 42 = 2352
    2352
    4200 (second number in equation gets 00 behind)
    ---------
    6552
    If you are multiplying 256 x 42
    256 x 42 (drop the 2)
    = 56 x 42 = 2352
    2352
    4200 (second number in equation gets 00 behind)
    4200 (add this value twice for every hundred value in your equation)
    ---------
    10752

    • @neetunagula1962
      @neetunagula1962 7 ปีที่แล้ว

      hmm not needed to write such a long comment just bla bla
      i just warn u not to give once morelike that

    • @meta4282
      @meta4282 7 ปีที่แล้ว +1

      Neetu Nagula Long comments are needed to explain important things.

    • @neetunagula1962
      @neetunagula1962 7 ปีที่แล้ว +1

      😈🙅

    • @mariafe7050
      @mariafe7050 7 ปีที่แล้ว

      Marachenka Ok great method
      So when I do 472 x 38, 72 x 38 = 2,736, now use 38 with 3,800, but do that 4 times
      Or either just multiply it = 15,200
      Do adding so 2,736 + 15,200 = 17,736
      Answer would be 17,736
      Ok is is good but I saw the other video about that first

    • @himanshiraikwar8053
      @himanshiraikwar8053 7 ปีที่แล้ว

      thanks marachenka
      it's a good method

  • @mathswithmrsfreeman4727
    @mathswithmrsfreeman4727 2 ปีที่แล้ว

    A very useful video Tecmath. Thanks so much.

  • @JenStudy-eb6we
    @JenStudy-eb6we 2 หลายเดือนก่อน

    Finally someone who makes since lol thank you for the help!!

  • @zero0police
    @zero0police 9 ปีที่แล้ว +4

    or even quicker... instead of 43 x 21 simplify the equation. instead 43 x 20. 860 right? add the remainder 43 that you left out of the equation because you took away 1 from 21, and there you have it. 903

    • @TehXyllo
      @TehXyllo 9 ปีที่แล้ว

      That works better with problems with a the ones digit under 5

    • @diegomendez1771
      @diegomendez1771 9 ปีที่แล้ว +1

      That works

  • @LoganStargazer
    @LoganStargazer 2 ปีที่แล้ว +6

    These math tricks are useful. Would you please do a series on *why* these work? That would make them easier to remember, I think. Do the math the long hard way first, then point out what your shortcuts are doing.

  • @Mystery-Chicken
    @Mystery-Chicken 2 ปีที่แล้ว

    Really Helps Me Out Thank You 🙏🙏

  • @ened5079
    @ened5079 ปีที่แล้ว

    pretty straight and forward thank you for this

  • @brenzmona-taofinuu2043
    @brenzmona-taofinuu2043 5 ปีที่แล้ว +4

    You were right in saying that probably half of us watching aren't even at school, I am one of those people haha

  • @micaiahyen5255
    @micaiahyen5255 4 ปีที่แล้ว +2

    This trick only works for some numbers but for others it doesn’t work ex.
    67x39=18_63
    Then 6x9=54 and 7x3=21 54+21=75
    Then it will become 25,563 but when you do it on the calculator the answer is 2,613.
    Although I might be doing it wrong so if anyone figures it out could you please comment on how you did it? Thanks!

    • @newbun438
      @newbun438 4 ปีที่แล้ว

      18_73 then 75
      Now, 187563
      Then,18+7 5+6
      Then, 25 and 11
      Then, 25113
      Then, 25carry1 and 13
      Then add carry 1 of 11 to the 5 and the answer is 6
      2613
      That's how I figure it out correct me if I'm wrong thanks

    • @maxamedshariif4878
      @maxamedshariif4878 4 ปีที่แล้ว

      67×39
      6×3=18 7×9=63
      Put together
      1863
      Multiply alternate numbers 6×9=54 3×7=21 add them 54+21=75
      Take these 1863 add this number 75 starting before last digit 186+75= 261 then write as this 2613

  • @babitabhatt776
    @babitabhatt776 3 ปีที่แล้ว +1

    Amazing!
    Thank you very much

  • @_langlang
    @_langlang ปีที่แล้ว +1

    I really struggle with math so your video's really do help thank you

  • @MsSdeep
    @MsSdeep 5 ปีที่แล้ว +3

    Thanks.... Kal exam me kaam aaega

  • @ik89_in96
    @ik89_in96 3 ปีที่แล้ว +5

    I already leard this when I was 10 and that this method does not always work for example :25 x 46
    Because there is a 5 you will need a different method or tricj

    • @GigaRxge
      @GigaRxge 3 ปีที่แล้ว

      You can I created a trick it always works
      After doing the steps it will come 11,230
      Basically add 2 and 3
      For example 35×46
      It will come 15830
      Add 8 and 3 its 11 and then add 1 to 15 its 16 and now remove the 3 from there and boom the ans is 1610

    • @ik89_in96
      @ik89_in96 3 ปีที่แล้ว

      @@GigaRxge thx

    • @GigaRxge
      @GigaRxge 3 ปีที่แล้ว

      @@ik89_in96 anytime friend

    • @ik89_in96
      @ik89_in96 3 ปีที่แล้ว

      @@GigaRxgeI'm a girl

    • @GigaRxge
      @GigaRxge 3 ปีที่แล้ว

      @@ik89_in96 oh

  • @peytoncastillo4508
    @peytoncastillo4508 2 ปีที่แล้ว +1

    Give this guy a medal

  • @fadelali330
    @fadelali330 2 ปีที่แล้ว

    Better than school time,awesome lessons.

  • @markcabiles8226
    @markcabiles8226 4 ปีที่แล้ว +5

    What if the product of the units are two digit? What u di u do?

    • @robertushkatea214
      @robertushkatea214 4 ปีที่แล้ว +3

      Carry the numbers over. Example 98x76 would be this:
      9x7=63 8x6=48
      So far we have 63__48
      Now for the middle:
      9x6 + 8x7 = 110
      So we get 63|110|48
      From 110, we carry 11 over 63, and from 48, we carry the 4 over 0:
      11 4
      63|0|48 63|0|8
      Add the numbers that were carried:
      74|4|8
      So the answer is 7,448.

    • @kekwnet
      @kekwnet 4 ปีที่แล้ว

      @@robertushkatea214 please tell of 84by68

  • @harassaeed6365
    @harassaeed6365 4 ปีที่แล้ว +14

    this doesnt work with high 2 digit numbers like 99x97

    • @Knowledgeovergrades
      @Knowledgeovergrades 4 ปีที่แล้ว

      Have you tried the box method for multiplication? I made a video on that.

    • @happypamplona3793
      @happypamplona3793 4 ปีที่แล้ว +1

      Exactly

    • @larrymachon5771
      @larrymachon5771 4 ปีที่แล้ว

      Yes i tried his examples multiples times, use the same trick as he used but one of them is workin

    • @larrymachon5771
      @larrymachon5771 4 ปีที่แล้ว

      None* yuh*

    • @abhinav1690
      @abhinav1690 4 ปีที่แล้ว +1

      97*(100-1)

  • @Q.1010
    @Q.1010 3 ปีที่แล้ว +1

    If I know this now and feel like a genius, how do you feel, thank you so much💜👏🏼

  • @kaydenadams2561
    @kaydenadams2561 4 ปีที่แล้ว

    Thanks for the vid mate!