Abacus Tutorial: 1 Basic function

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  • Опубліковано 2 лют 2025

КОМЕНТАРІ • 289

  • @preciousangela2651
    @preciousangela2651 4 роки тому +222

    When Corona Virus strikes, I choose to learn abacus! Yeay 2020! :P

  • @Iknownothing896
    @Iknownothing896 4 роки тому +33

    Now this is the kind of video tutorials that the world need, simple, short, full intented information deliver 👍. Great vid.

  • @pinklady7184
    @pinklady7184 4 роки тому +107

    I have just last week ordered an abacus like this. I can't wait to use it. It is a pity that I had never learned abacus in schools.

    • @mariemorganhenry9072
      @mariemorganhenry9072 4 роки тому +4

      I bought three of them 25 years ago for decoration because I remembered having one as a kid. Now I know how to use them. I am going to teach my three and two year old grand children how to count.

    • @unidentifiable.individual
      @unidentifiable.individual 3 роки тому +7

      I wouldn't say it's a pity. No one learns it because it's obsolete. There's no point.

    • @Jorindeify
      @Jorindeify 3 роки тому +19

      @@unidentifiable.individual I wouldn't say that. Children in Singapore are able to do complicated additions etc. by heart because they practised it on the abacus.
      In Japan there are even competitions on abacus calculations.

    • @malagebide
      @malagebide Рік тому

      This is an invention from China, which is said to be from other countries. Why are these people keen on stealing other people's culture

    • @darnit1944
      @darnit1944 8 місяців тому

      ​​@@unidentifiable.individual People who can calculate without calculator are quick thinkers. Plus abacus may be obsolete as a counting device, but calculators never taught you how to calculate.

  • @tjoseph5918
    @tjoseph5918 4 роки тому +63

    I thought these were Chinese percussion instruments. So much for my "instrument" collection.

    • @Weeping-Angel
      @Weeping-Angel 24 дні тому +1

      It can still be a Chinese instrument. It is a Chinese math instrument!

  • @piranhacupcake5154
    @piranhacupcake5154 6 років тому +77

    I saw an abacus being used to count in a comic book and became curious has to how they work. This was very well explained, I would now be able to use an abacus myself! Thank you for making this! :D

    • @34Witchdoctor
      @34Witchdoctor 5 років тому +3

      I watched director ton use one in aggretsuko. I actually really like this system!

    • @Koijixoxo
      @Koijixoxo 2 роки тому

      same

  • @hellespont5072
    @hellespont5072 9 років тому +160

    Finally today I learned what an abacus actually does!

  • @mallisadubissette-munroe4438
    @mallisadubissette-munroe4438 4 роки тому +15

    after trying to understand this for the last 2 hours, your video helped me in 3 mins...thanks

  • @LFSPharaoh
    @LFSPharaoh 3 роки тому +156

    Kind of disappointed they never taught me this in school. I'm kinda young, but getting rather close to 30 I suppose. Even my early private education that was way ahead of the public education didn't mention a word about it. The Abacus almost reminds me of roman numerals in a weird way, that I can't quite put words to. I think everyone should learn it at some point because it's a different way of thinking, calculating, visualizing etc. I feel those parts of the brain are almost never activated in schools. It's another way we can show and prove an objective reality, through abstraction.

    • @dafoex
      @dafoex 2 роки тому +5

      Having looked at a few abacus videos just out of curiosity, I think the "4+1" style is exactly analogous to roman numerals. Starting at the rightmost column, each bottom bead is worth I (1) and the top bead is worth V (5), a column with three bottom beads and one top bead is worth VIII (8). Similarly for the next column, each bottom bead is worth X (10) and the top bead is worth L (50). The next column is C (100) and 500 (I can't recall the roman numeral for 500 off the top of my head, but by this point I'm sure you get the idea).

    • @NopeSecret
      @NopeSecret 2 роки тому

      This is a waste of time to learn how to use.... just saying lol

    • @wiwisjxkalnz
      @wiwisjxkalnz Рік тому

      ​@@NopeSecretwhy?

    • @rizzwan-42069
      @rizzwan-42069 10 місяців тому +3

      ​@@NopeSecretnot a waste of time while calculators exist this can still be used for education purposes like teaching different bases like binary dozenal hexadecimal seximal etc

    • @iamhereblossom1588
      @iamhereblossom1588 10 місяців тому +1

      School will not teach you everything in the world. It is on the children to be curious to learn.

  • @joetran5030
    @joetran5030 10 років тому +31

    When I was taught this as a little kid, we were given a table to learn it by heart...
    And I was told that for a male to succeed in business, one should be able to use the abacus with the left hand and write with the right hand...

    • @kitsilanocat
      @kitsilanocat 7 років тому +29

      Joe Tran did you grow up in ancient Egypt or something?

    • @tr4nsg0th1ca
      @tr4nsg0th1ca 6 років тому +9

      Since I write with my left hand, I work an abacus with my right.
      And I'm a mechanic, not a businessman... its surprising how well the abacus adapts to being used for engineering physics equations.

    • @eldoritos5893
      @eldoritos5893 4 роки тому

      Did you succeed in business?

    • @thatsroughbuddy1407
      @thatsroughbuddy1407 4 роки тому +1

      @@kitsilanocat No, 70s East Asia

  • @spazkong
    @spazkong Місяць тому +1

    It's like the BIT system in so many ways. Easy when you understand. Thank you for posting this. One of my favourite tools and everybody should learn this. Before computers and pocket calculators, we did abacus and paper. Long live the real world :)

  • @JoeBieniecki
    @JoeBieniecki 8 років тому +25

    Thanks for the simple and elegant explanation, very well done.
    Came here because I want to build a robotic calculator using arduino + servos, you enter the numbers on a "normal" calculator pad and the servos move the abacus beads to give your answer. Completely frivolous device but it will be fun to build : )

    • @pellelindbla-lifeisbetteri4446
      @pellelindbla-lifeisbetteri4446 8 років тому +2

      Sounds really interesting. Could I have a try when you are ready?

    • @fatiimaa9322
      @fatiimaa9322 3 роки тому +2

      Can you please tell me the difference between abacus with 13 columns and abacus with 5 columns

    • @steveoommen6269
      @steveoommen6269 3 роки тому +1

      So how did it go?

  • @abdulhaseeb1817
    @abdulhaseeb1817 7 років тому +26

    Very simple but effective video. Thank you, just what I was looking for sir.

  • @deefee701
    @deefee701 4 роки тому +15

    I've always wanted to learn about the Chinese style abacus.

  • @peachfreude
    @peachfreude 6 років тому +10

    Im happy that I finally able to understand how this thing works. Thank you, mister! That was a wonderful explanation.

  • @eggyolk8067
    @eggyolk8067 3 роки тому +1

    A game called Untitled Door Game in Roblox asked me to search up on how to use an Abacus. Found this very useful thank you

  • @smithraymond09029
    @smithraymond09029 11 років тому +121

    Hot tip: DO NOT bump the abacus, lol.

  • @CastleHassall
    @CastleHassall 11 місяців тому +1

    thanks, it was very useful to hear you explain this

  • @lindblalasskrivutvecklinga2601
    @lindblalasskrivutvecklinga2601 7 років тому +14

    I also use a calculator but the abacus is a good tool for teaching the foundations of math. I also develops your thinking. A calculator don't.

    • @fatiimaa9322
      @fatiimaa9322 3 роки тому

      Can you please tell me the difference between abacus with 13 columns and abacus with 5 columns

    • @ValleysOfRain
      @ValleysOfRain 3 роки тому +2

      @@fatiimaa9322 the number of columns an abacus has simply denotes the maximum number it can achieve.
      A 5 column abacus maxes out at 99,999. A 13 column abacus stops 1 short of 10 trillion.

  • @dang25272549
    @dang25272549 2 роки тому +2

    On 2022 this tutorial still useful to me , Thanks so much.

  • @abdullahalfahim4248
    @abdullahalfahim4248 2 роки тому

    Thank you very much from Bangladesh 🇧🇩❤️🌹

  • @airliner7478
    @airliner7478 2 роки тому +1

    This man has answered one of life's greatest mysteries...

  • @AltanStray
    @AltanStray 3 місяці тому

    Thank you, just wanted to know the basics of an abacus because of a strange tangent I had from a video that had an abacus in it for about 5 seconds.
    Quick, concise and simple to understand, thanks for the demonstration and explanation.

  • @flippersthedolphin
    @flippersthedolphin 10 років тому +3

    Thank you for this tutorial! I have been struggling to find a good tutorial for a Chinese abacus.

  • @gammondog
    @gammondog 10 років тому +8

    Thanks. I am familiar with the 1 by 4 soroban and didn't know how the the "extra" beads came into play.

  • @tarzanjane9440
    @tarzanjane9440 4 роки тому +2

    Now i kmow how abacus uses. I have that one butvi dont know how to use. Thank you. 💕

  • @CanariasCanariass
    @CanariasCanariass Рік тому

    Hi! It's so simple yet I never learned this anywhere. Thank you for this video

  • @stevenkelty8025
    @stevenkelty8025 8 років тому +4

    I love the mental abacus app and would like to see a set of complementary videos for the modern abacus to explain different functions. A left handed option in the settings would be nice also.

    • @lindblalasskrivutvecklinga2601
      @lindblalasskrivutvecklinga2601 8 років тому

      +Steven Kelty Happy that you like the app. In the app there are films to show how you use the modern 1+4. Go to the book symbol in the upper right corner. It will open a menu. There you find the videos. In settings you can choose between classic and modern abacus

  • @Grunfeld
    @Grunfeld 3 роки тому +10

    Thank you. The mention of "complementary numbers" at 0:45 (on the other 4+1 type abacus) was, for me, so illuminating. How have I not seen that? And that error of perception was behind my struggles to perform subtraction on that abacus. So simple when you see it. 👍👍🙂

  • @bensheather1187
    @bensheather1187 8 років тому +2

    Thank you so much! Needed to read an abacus for a test and I had no idea! this helped me so much! Thanks again!

  • @sruthybijukumar4235
    @sruthybijukumar4235 3 роки тому +2

    Found it really helpful and easy to understand. Thank you!

  • @wills9627
    @wills9627 3 роки тому +9

    this way better than the any modern elctrictronic calculator, i wish i was taught that at school,

  • @DarkAngel-fk3hx
    @DarkAngel-fk3hx 8 років тому +3

    THANK YOU SO MUUUCH! I am going to ask my mom to buy me an abacus. thanks for teaching us

    • @paolamunoz1833
      @paolamunoz1833 3 роки тому

      I made my own with an old picture frame, hair beads and bamboo sticks 🍡

  • @Layla-sy3wv
    @Layla-sy3wv 3 роки тому

    Thank you for sharing this, I just received my first abacus through the mail and am exited to try it

  • @ABCTubeTV
    @ABCTubeTV 4 роки тому

    thank you so

  • @AnthonyFrancisJones
    @AnthonyFrancisJones 11 місяців тому

    Excellent! Bought one in HK many years ago and you make it look really easy!

  • @cedricantunes4600
    @cedricantunes4600 9 років тому +8

    I want one so badly now... Nice video!

  • @mikenorman7233
    @mikenorman7233 5 років тому +9

    My cell phone has this cool feature it also lets me call your mom

  • @josephgaviota
    @josephgaviota 2 роки тому

    Thank you for this short and clear explanation.

  • @KyneticFlux
    @KyneticFlux 3 роки тому +1

    Amazing explanation right there, concise and precise!

  • @PhuongNguyen-jb5qb
    @PhuongNguyen-jb5qb 8 років тому +3

    Thanks, nice video. I ' d like to know if you have a video showing how to do the multiplication and the division. Thanks again.

  • @sallywong7309
    @sallywong7309 4 роки тому +2

    wow, great instruction video. much appreciated..

  • @abdumalikmustapha4689
    @abdumalikmustapha4689 9 років тому +7

    I'm amazed that the binary system is so similar to an abacus... we live in a world where millions abacuses count themselves, and are just large enough to fit in our palms.

    • @pellelindbla-lifeisbetteri4446
      @pellelindbla-lifeisbetteri4446 9 років тому

      +Abdumalik Mustapha
      Yeah. The abacus is fascinating. I also use it to explain the binary system. Then I just take a pliers and split the beads so I i can take them away. I leave 2 beads on every rod. It works great!

    • @1337flite
      @1337flite 4 роки тому +1

      All postional numbering systems are similar to the abacus.
      Postional numbering systems use colums to represent multiples of the base number. E.g. in the "normal" base 10 system the columns represent hundreds, tens and units etc and you change columns (carry) when you reach the base value, e.g. in base 10 (i..e. decimal or :"normal" numbers) you carry when a colum reachees ten.
      It could be adapted to binary (base 2) octal (base8) and ehxadecimal (base 16) numbers, although hex would make for a larger abacus.
      It's really sad that so many people don't understand the idea of positional numbers even for the everyday common decimal system.
      Understanding that makes arithmetic so much more intiutive and so much faster.
      I think ore people would actuaklly enjoy math if they understood the basic numbering system.

  • @takemetoyonk
    @takemetoyonk 4 місяці тому

    Damn the app is really good compared to any PC website for an abacus simulation. Looks good enough and has tactile sound.

  • @Atheistic007
    @Atheistic007 2 роки тому +1

    Analog computer. It works 24/7 and never needs an update. Win.

  • @demise234
    @demise234 8 років тому +1

    Thank you I have had my 'chinese' abacus for twenty years and been using it incorrectly. Now I get it.

  • @kayeninetwo3585
    @kayeninetwo3585 2 роки тому

    Thank you for a straightforward approach to understanding the abacus. The other youtube video from "HEV Project" was rambling and vague...the presenter didn't have a structured presentation style. A minute and a half into his video and you still didn't know what an abacus was or what it was used for. They disabled the comments over at that video for obvious reasons.

  • @mojoNoodlz
    @mojoNoodlz 8 років тому +5

    The double beads in the top row are used for base 16 calculations. 2 top beads plus 5 bottom beads adds to 15 and no beads for the zero, the 16 values in the base 16 system. Think old days before metric system and things like pounds and ounces.

  • @pellelindbla-lifeisbetteri4446
    @pellelindbla-lifeisbetteri4446 11 років тому +1

    Thank´s for the kind comment ; )
    Pelle

  • @lhu0972
    @lhu0972 4 роки тому

    First time watching a video on how it works and I already somewhat understand how it works!

  • @douglashaner6802
    @douglashaner6802 3 роки тому +2

    I am 52 and remember using a smaller type in 1st grade.

  • @wheresmyepiglottis
    @wheresmyepiglottis 6 років тому +2

    In daily life,It is more useful and less expensive than an electronic calculator except for school students.

  • @TheAdmirableAdmiral
    @TheAdmirableAdmiral 4 місяці тому

    I was running some probabilities for one of my board games like risk and I had quarters and nickels and was sliding them accross a line while tallying how often the nickel team vs quarter team won. And there was a moment where I was balancing nickles and tallys where I thought to myself... man, I could really use an abacus right now

  • @GOLDEditNinja
    @GOLDEditNinja 7 місяців тому

    This was an awesome tutorial my friend. cheers.

  • @kumustapo9520
    @kumustapo9520 2 роки тому

    AW... I'VE SEEN THIS THING WHEN I WAS IN KINDER AND DAYCARE.
    HENCE, THEY DON'T TEACH US TO USE THAT THING..
    BUT WITH THE HELP OF THIS VIDEO, I KNOW NA HOW TO USE THAT THING.
    AND MAYBE IF MY MOM WILL BECOME A TEACHER AT DAYCARE, I'LL TEACH SOME STUDENT TO USE THIS AT THE EARLY STAGE.
    THANK YOU

  • @dareabdulwasiu3753
    @dareabdulwasiu3753 9 років тому +2

    Thanks for the explanation...Awesome!!!

  • @SergioBecerraII
    @SergioBecerraII 4 роки тому

    Where can I find the classical version of the abacus.

  • @Jaystah2
    @Jaystah2 Рік тому

    Such a clearly explained video, thank you!

  • @BRasaq
    @BRasaq 4 роки тому

    Thank you so much. There is Abacus calculation in one of ACCA unit module. I have been struggling for a day now. Thanks for the video 👍👍👍👍👍🤗

    • @monikanaholo1195
      @monikanaholo1195 4 роки тому

      Hi, I am here because I am stuck on that question. What is the correct answer?

    • @BRasaq
      @BRasaq 4 роки тому +1

      Hi, sorry I can't remember the answer I did this last August. But I think is are 100 +. Try and listen to the video you will get the logic.

    • @monikanaholo1195
      @monikanaholo1195 4 роки тому +1

      @@BRasaq thank you. I did manage to get the answer.

    • @BRasaq
      @BRasaq 4 роки тому +1

      Glad you found the answer

  • @BhavyaR-g1o
    @BhavyaR-g1o 15 днів тому

    Can you do a ( 10 : 2 ) Abacus tutorial with binary numbers?!

  • @pellelindbla-lifeisbetteri4446
    @pellelindbla-lifeisbetteri4446 4 роки тому

    Happy you liked it!

  • @iansteel6403
    @iansteel6403 Рік тому

    I'm very confused as to why there are two beads on the top if they are just automatically being converted to one lower bead in the next column. It seems like a superfluous action that slows you down compared to the other method?

  • @jasonmarkson3773
    @jasonmarkson3773 6 років тому +1

    Great video, very clear and easy to understand. Tak.

  • @cameronellem7144
    @cameronellem7144 Рік тому

    I have one question, should I practice with the old style abacus for the new style Abacus if I want to do mental calculations?

  • @zossss
    @zossss 6 місяців тому

    i had an abacus in like 1st grade cus the school i went to at the time im pretty sure taught us how to use one, then i joined a comp for it, dont remember much but im pretty sure i performed horribly, i have since then lost that abacus but i wanna relearn it just for fun and im just gonna do it with an imaginary abacus lmao

  • @iamtomkills
    @iamtomkills 4 роки тому

    This was brilliant. Great video.

  • @vicki2548
    @vicki2548 3 роки тому

    Good morning, I am searching for abacus turtorials on UA-cam and found this tutorial the clearest. The movements are clear and the English is clear. Where do I find further tutorials by Lindbla ?

  • @fatiimaa9322
    @fatiimaa9322 3 роки тому

    Can you please tell me the difference between abacus with 13 columns and abacus with 5 columns

  • @ReemoTsukiyomi
    @ReemoTsukiyomi 9 років тому +4

    Thanks for the explanation, Sir!

  • @thatsroughbuddy1407
    @thatsroughbuddy1407 4 роки тому

    What is the purpose of the two five beads? To make it look fancy? If you immediately exchange it for a ten then what is the point of having 2 Fives? I can count perfectly fine with one.

    • @pellelindbla-lifeisbetteri4446
      @pellelindbla-lifeisbetteri4446 4 роки тому +1

      Hi! The 5+2 abacus is the old classical design. This model is good for beginners as the see the process with changing from 1 to 10 and so on. I use the modern 4+1 myself. If you look into the settings in the app you will find that you can switch beween 5+2 and 4+1 depending on which one you prefer.

  • @vicki2548
    @vicki2548 3 роки тому

    Mr Lindbla, which complementary books would you recommend for learning abacus ? thank you

  • @iknowyouknowleeknow2485
    @iknowyouknowleeknow2485 2 роки тому

    Here I am. It’s 3:00 am right now and I’m suddenly wanting to learn how to use Abacus

  • @TahitianBlissMeeBee
    @TahitianBlissMeeBee 11 років тому +1

    so far the most explanatory for me- thank you!

  • @cerium58
    @cerium58 3 роки тому

    Thanks! I always wanted to learn how

  • @pellelindbla-lifeisbetteri4446
    @pellelindbla-lifeisbetteri4446 11 років тому +2

    Hi.
    I also use the modern abacus when I count. But when I teach beginners I use the 5+2 to start with. That way they get a jump start without having to learn the so called complemetary numbers. After a while students many times start to calculate without using "exchange" and instead use the "short, fast way". At that time I present the modern abacus. Then the students really feel that they have made progress!

  • @mimiseetapun7620
    @mimiseetapun7620 2 роки тому

    Why are you use the Avenue across from the right to the left, instead of from the left to the right as I can remember the Chinese will use?

    • @pellelindbla-lifeisbetteri4446
      @pellelindbla-lifeisbetteri4446 2 роки тому

      Just do it this way when I´m showing the function of the abacus. When calculating I alwaysgo from left to right.

  • @PrithwirajSen-nj6qq
    @PrithwirajSen-nj6qq 8 місяців тому

    Nothing but place value addition
    235=200+30+5
    (take from the lower portion of third row 2 beads : third row lower portion each bead is 100
    3 beads from lower portion of second row is 30: lower portion second row each bead is
    10
    The first row upper portion each bead is
    5

  • @NikolajLepka
    @NikolajLepka 6 місяців тому

    the extra beads seem really unnecessary, why not just do the exchange directly?

  • @interesting_knight1161
    @interesting_knight1161 3 роки тому +4

    I am here because the teacher said no calculator

  • @3bcgy16
    @3bcgy16 5 років тому +2

    Thank you!

  • @larsfinlay7325
    @larsfinlay7325 2 місяці тому

    Can you use it with decimals?

  • @xitaris5981
    @xitaris5981 8 днів тому

    So.. how often are people really using all 13 rods? Do they have a version with just 6 rods?
    Edit: apparently you use both the left and right side of the Abacus to do calculation ? So nvm

  • @jordanfebish8494
    @jordanfebish8494 11 років тому +1

    Why were the rods on the very left moved out of the line? This confused me a lot, but great starter video. ;)

    • @pellelindbla-lifeisbetteri4446
      @pellelindbla-lifeisbetteri4446 11 років тому

      Hi
      The rods where moved out in order to zoom in on the rods that where active when counting. Nice that you liked the film. I also have Mental Abacus app for Android (and soon for iPad/iPhone)

    • @jordanfebish8494
      @jordanfebish8494 11 років тому

      Pelle Lindblå THANK YOU VERY MUCH.

  • @MissPiggyM976
    @MissPiggyM976 Рік тому

    Very clear , thanks !

  • @pellelindbla-lifeisbetteri4446
    @pellelindbla-lifeisbetteri4446 4 роки тому +1

    Thanks a lot!

  • @AldoreBryer
    @AldoreBryer 10 років тому

    hi pelle! i live in stockholm and i have been looking for a good modern abacus for my sisters daughter who is 6 months old. do you know where i should look locally? or where to order one within sweden?

  • @angieanahidiaz1009
    @angieanahidiaz1009 9 років тому +1

    u explained this a lot better thank u so much

  • @JawadJabbarKhanAuthoi
    @JawadJabbarKhanAuthoi 4 місяці тому

    this is a great video

  • @potatogonyes7730
    @potatogonyes7730 3 роки тому

    I remember in my childhood using an abacus in the wrong way and pretending to control the world. Each time I move a ball, something in the world "changes" and I can "decide" what I want to change.

  • @keithjohnson5190
    @keithjohnson5190 2 роки тому

    I am learning the Japanese and the Chinese abacus. I am doing subtraction and addition on both and have to agree that the Chinese abacus is easier. The Japanese has little friends and big friends and the boss, but once you start to learn it it get easier and they should teach this in school as it would help the children to learn. Nice video but too short.

  • @sweetangel1814
    @sweetangel1814 9 років тому +3

    Fanx for the explanation 😀

  • @bwe786
    @bwe786 4 роки тому

    so difficult please tell how to use i didnt understand it

  • @JerryWoo96
    @JerryWoo96 3 роки тому

    normally i use the top bar of each section as counted so i can reset the abacus easily just but tilting.

  • @Md.Amanullah-r1c
    @Md.Amanullah-r1c 3 місяці тому

    I heard a lot about abacus that it is a calculation machine. But I didn't have any idea how it calculates, how it works until I watch this video

  • @salvadorperez4934
    @salvadorperez4934 3 роки тому

    Broo that’s cool very interesting…. I always wonder how tf do they use those things

  • @keithkent6275
    @keithkent6275 3 роки тому

    The second topbead seems pointless. As soon as it's needed it returned in favour of the next columns one bead. Unless of course you wanted to count to fifteen in one column

  • @Kagebushin01
    @Kagebushin01 8 років тому +1

    Very easy to understand thank you very much!

  • @drmahesh5699
    @drmahesh5699 8 років тому

    I would like to adopt chinese speed calculation system plese give me information

    • @pellelindbla-lifeisbetteri4446
      @pellelindbla-lifeisbetteri4446 8 років тому +1

      Hi. Nice that you are interesed in the abacus. It is a bit to much to explain in this forum. I you want we can have Skype meeting. Please let me know and we can find a time that suits us both. You can also look at my app Mental Abacus Expert. It is aimed to develop mental abacus spee calc.

    • @kellygiuggio6199
      @kellygiuggio6199 8 років тому

      Dr mahesh jam,@@

  • @thomast8539
    @thomast8539 4 роки тому

    That is great, now how do you do math with this tool?

  • @Godsavetheboy
    @Godsavetheboy 2 роки тому

    Well explained!

  • @tranthaibaonguyenoss198
    @tranthaibaonguyenoss198 2 роки тому

    I used to learn this like 6years ago that's was when I was 6 now I can't seem to remember how it work anymore.