Weird trick with any 3-digit number!

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  • เผยแพร่เมื่อ 27 ส.ค. 2024
  • #shorts #short #digit #digits #number #numbers #math #mathematics #calculator #trick #surprising
    Combo Class is a crazy educational show where you can have fun learning rare things about math, science, language, and more! This is the SHORTS channel for faster-paced videos. Make sure you're also subscribed to the main Combo Class channel where full episodes go!
    DISCLAIMER: any use of fire, tools, or other science experiments in this series is always done in a safe and professional way. Do not try to copy any actions you see in this series yourself.

ความคิดเห็น • 320

  • @matthewdodd1262
    @matthewdodd1262 ปีที่แล้ว +1420

    7×11×13=1001.
    That's why you can take ABC, do the trick and get ABCABC, then doing again with a small enough number will result in ABCXYZABC where XYZ as a 3 digit number is ABC × 2

    • @bongsesh
      @bongsesh ปีที่แล้ว +30

      I'm glad somebody did the work lol

    • @madanyadav9708
      @madanyadav9708 ปีที่แล้ว +11

      Genious 🤯

    • @sanoh_224
      @sanoh_224 ปีที่แล้ว

      Wow

    • @srshah
      @srshah ปีที่แล้ว +1

      At least someone is good at maths

    • @phantomphoenix8828
      @phantomphoenix8828 ปีที่แล้ว +2

      "I did the math" guy

  • @fleursdelilas9487
    @fleursdelilas9487 ปีที่แล้ว +303

    7x11x13=1001
    So if you multiply by it you get 1000 times the number (which is the same nember with three zeros) plus the number itself (which replaces the zeros)
    That's clever

    • @entermessiah9492
      @entermessiah9492 ปีที่แล้ว

      No clever at all, or at least more clever than you because we can do a lot of combination to have 1001. He tricked you and definitely clever than you but only YOU, not me.

    • @fleursdelilas9487
      @fleursdelilas9487 ปีที่แล้ว +13

      @@entermessiah9492
      It's a clever trick to show to kids for example. Doesn't mean you eed to be a genius to understand it.

    • @entermessiah9492
      @entermessiah9492 ปีที่แล้ว

      @@fleursdelilas9487 agree, it's clever to show to kids who said "That's clever".

    • @fleursdelilas9487
      @fleursdelilas9487 ปีที่แล้ว +7

      @@entermessiah9492
      Sure, Ramanujan

    • @entermessiah9492
      @entermessiah9492 ปีที่แล้ว

      @@fleursdelilas9487 sure, kid

  • @Marl3421
    @Marl3421 ปีที่แล้ว +215

    I remember getting asked this at a maths challenge in primary school. Except we decided it would be easier to multiply the 3 primes together first, ruining the entire trick

    • @Monkey_Luffy01
      @Monkey_Luffy01 ปีที่แล้ว +1

      No it won't

    • @Marl3421
      @Marl3421 ปีที่แล้ว +13

      @@Monkey_Luffy01 yeah it did be the whole point was finding out how it works

    • @eternxlhaaris5811
      @eternxlhaaris5811 ปีที่แล้ว

      @@Marl3421 isn’t it already pretty obvious?

    • @Marl3421
      @Marl3421 ปีที่แล้ว +2

      @@eternxlhaaris5811 yes but it ruins the fun of the trick

  • @isjosh8064
    @isjosh8064 9 หลายเดือนก่อน +2

    7*11*13 = 1001
    1001*a = 1000a + a
    Chosing any random three digit integer for a would result in having that theee digit number: abc times 1000 = abc000 and adding that number again ; abc000 + abc = abcabc
    This works for 1001^n * a where a is a three digit number and a is less than 1001/n where n is an integer between 1 and 693.

    • @ingogoldbeck2886
      @ingogoldbeck2886 8 หลายเดือนก่อน

      the last Part is important. A less than 1001/n

  • @mojeplejlisty
    @mojeplejlisty ปีที่แล้ว +26

    Love your vids. Keep em coming!!!

  • @Teo117
    @Teo117 ปีที่แล้ว +37

    You are opening my mind. Please never stop! I love learning and this is amazing

    • @BILTDIFRENT
      @BILTDIFRENT 9 หลายเดือนก่อน

      He is multiplying by 7, 11, and 13, which is the same as multiplying by 1001. That basically takes the number, shifts it over 3 digits, and adds the number back again, making it repeat.

  • @Boxingbtos7890
    @Boxingbtos7890 ปีที่แล้ว +2

    7•11•13 = 1001
    So when you multiply your 3 digit number the 1 makes up XYZ,345 and the 1000 boosts that original number up to 345,XYZ. Put together (1000+1)345 you get 345,345

  • @werwurm
    @werwurm ปีที่แล้ว +43

    Try multiplying with 73 and 137. It should work with 4 digit numbers. 🤯

    • @random20000
      @random20000 ปีที่แล้ว +6

      because that's multiplying it with 10001
      it will work when u multiplying by any factors of 10001 (for 4 digits) and 1001 (for 3 digits)

    • @werwurm
      @werwurm ปีที่แล้ว +3

      @@random20000 🤫

    • @xaigamer3129
      @xaigamer3129 10 หลายเดือนก่อน +3

      Do it with 101 × 3541 × 27961, should work with 9 digits

    • @SatvikChowdhary
      @SatvikChowdhary 3 หลายเดือนก่อน

      ​@@xaigamer3129Nope...it works with 10 digit numbers actually

  • @yousefelsamadouny904
    @yousefelsamadouny904 ปีที่แล้ว +12

    Underrated content fr some of the most interesting things I see.

  • @lonetuber5148
    @lonetuber5148 ปีที่แล้ว +5

    Great videos man. Thats a channel I would love for my kids to watch

  • @Just-A-Chill-Gamer
    @Just-A-Chill-Gamer 9 หลายเดือนก่อน +9

    And the middle was 690, which is not only nice tenfold, but also 345×2!

    • @kenbroadbent7288
      @kenbroadbent7288 8 หลายเดือนก่อน

      Which is 1000*1*2... Of course

  • @themaninblue8393
    @themaninblue8393 9 หลายเดือนก่อน +1

    Hey so i found something that’s pretty cool. I figured this out when i was around 10 or 11, im 13 now and have been waiting to tell someone.
    So, grab any four digit number. Take the absolute value of the difference between the first and second digits, then take that as the first digit of the new number. Then repeat this for the 2nd and 3rd digit, 3rd and 4th digit, but then you do the difference between the last and 1st digit. The new number should be an entire different number, but repeat this process now again for the new number. Repeat this enough times for literally any number and it will always eventually come out to 0000. I honestly have no idea how this works but it does, and its pretty fun to mess around with on some notebook paper.

    • @btb2954
      @btb2954 9 หลายเดือนก่อน

      Cool! I've found it takes 8 iterations of this to make any positive 4 digit number go to 0

  • @samuelbrown434
    @samuelbrown434 27 วันที่ผ่านมา

    Hahaha pointing out that it’s the 4th, 5th, and 6th primes feels like a misdirection because the real important number is 1,001 which would be the case no matter what its prime factorization would be for this trick. Basically you’re multiplying your original number by 1, and then by one again but moving the decimal three places to the right. Multiplying by different powers of 1,001 yields similar results. The example gives you multiplying your number by 1,002,001 which is why it doesn’t work for numbers bigger than 499. The next power of 1,001 is 1,003,003,001 which shouldn’t work for numbers larger than 333. I think you get 333,999,999,333. Neat math trick! Thanks for sharing!

  • @interabie
    @interabie 9 หลายเดือนก่อน

    If the number is small enough:
    If u do it twice, the number in the middle is double the original. If u do it 3 times, the 2 numbers In The middle are triple the original number.
    115 - 115,115 - 115,230,115 - 115,345,345,115

  • @tamirerez2547
    @tamirerez2547 9 หลายเดือนก่อน +7

    Here is another amazing trick:
    Take a 3 digits number, any number, and multiple it by 1001. Look at the result...
    Isn't it AMAZING??😂

    • @_apsis
      @_apsis 9 หลายเดือนก่อน

      appreciate the cool math and move on

    • @santhoshs9933
      @santhoshs9933 9 หลายเดือนก่อน

      ​@@_apsis🤣 u guys multiplying two numbers and calling it cool😭😭😭

  • @giovanji7883
    @giovanji7883 9 หลายเดือนก่อน

    Also if you do it with a very small number with 3 digits (like 100) by doing this again and again you get a sequence that in my language is called tartaglia's triangle
    100.100 (1 1)
    100.200.100 (1 2 1)
    100.300.300.100 (1 3 3 1)
    100.400.600.400.100 (1 4 6 4 1)
    This is a very cool trick!

  • @reznovvazileski3193
    @reznovvazileski3193 หลายเดือนก่อน

    First one works because 7*11*13 = 1001. By how the decimal system works, it pretty much concetenates the number to itself times 1, which is the number itself at an interval of 3 since every 3rd spacing past the first 1 is also a one.
    The second one is more interesting. This happens because the middle three numbers will always be number*2 since 1001^2 = = 1002001. 499 is fine here and evades any problems, but once you go 500 it will make 1000 and carry over a 1 into your first three digits.

  • @tutong6399
    @tutong6399 ปีที่แล้ว +4

    Me looking at his window the whole time: 👁👄👁

  • @kirbypro8112
    @kirbypro8112 ปีที่แล้ว +4

    I have seen this before but this is still is interesting with it being 1001.

  • @Mou3allembelgayb
    @Mou3allembelgayb ปีที่แล้ว +5

    I have just learned that 1,001 is not prime. Thank you sir.

    • @jonnamechange6854
      @jonnamechange6854 9 หลายเดือนก่อน

      indeed, it has three prime factors

  • @RedGallardo
    @RedGallardo ปีที่แล้ว +1

    Also the middle number is the number doubled. 345x2=690

  • @jeremystone56
    @jeremystone56 8 หลายเดือนก่อน

    It works because you're telling everybody the answer is random. When you multiply two numbers your answer is never random

  • @joiedevivre5119
    @joiedevivre5119 9 หลายเดือนก่อน +2

    When performing arithmetic ALWAYS wear a lab coat.

  • @slg642
    @slg642 ปีที่แล้ว +4

    Do this repeatedly with 111. It is perhaps my favorite.

  • @davidpearlman2272
    @davidpearlman2272 ปีที่แล้ว

    7x11x13=1001, and if you multiply a number by 1001 it would equal the three digit number twice side by side, Because if you multiply by 10, 100, 1000, Etc. the number would move to the left depending on if it's 10, 100, 1000, Ect

  • @evanhostetter2891
    @evanhostetter2891 8 หลายเดือนก่อน +1

    Did you know that Pascal’s triangle numbers are powers of eleven? Cuz 1=11^0,11=11^1,121=11^2 and so on and on and on forever and ever

  • @TimothyWmYoung
    @TimothyWmYoung 9 หลายเดือนก่อน

    Why didn't you mention that the sum of the first and third numbers added together, equal the center number??

  • @josandoy
    @josandoy 8 หลายเดือนก่อน

    Finally, a short that impressed me and was worth watching. Kudos to you!!!

  • @colinjava8447
    @colinjava8447 9 หลายเดือนก่อน

    Remember this from school, you pick a 3 digit number, say 852 then type it in again, to get 852852.
    Then divide by 7,11,13 and you get 852 again.
    Not rocket science though.

  • @thepaperempire7954
    @thepaperempire7954 ปีที่แล้ว +19

    mfs who chose 000 as their 3 digits :

    • @dak_attack1089
      @dak_attack1089 10 หลายเดือนก่อน +5

      000,000

    • @thatonevideo1875
      @thatonevideo1875 9 หลายเดือนก่อน

      @@dak_attack1089pretty sure it would just be 0 by itself on any calculator, but I get your point 😂

    • @swe_vinne8844
      @swe_vinne8844 9 หลายเดือนก่อน

      ​@@dak_attack1089000,000=0

    • @tonystone10K
      @tonystone10K 9 หลายเดือนก่อน

      @@dak_attack1089 Why did I initially read this as "Zero hundred thousand" lol

  • @davidnix5211
    @davidnix5211 ปีที่แล้ว +1

    Your videos kick a$$!

  • @-cloudfall-
    @-cloudfall- 10 หลายเดือนก่อน

    And the middle of the 9 digit number also has exactly double of your original number as the middle 3 digits (at least in this example, not sure where it breaks. 500 again?). Neat trick.

  • @jacksondavid706
    @jacksondavid706 ปีที่แล้ว

    Because 7*11*13=1001 which means any 3 digit number repeats itself just like multiplying one digit number by 11

  • @davids9522
    @davids9522 2 หลายเดือนก่อน

    the number in the middle is twice the starting number

  • @terranceparsons5185
    @terranceparsons5185 9 หลายเดือนก่อน

    Also, the middle 3 digts of the 9 digit answer is double the first and last 3!

  • @yetut2146
    @yetut2146 ปีที่แล้ว +3

    That's worthy of a like and share

  • @Jandy13
    @Jandy13 10 หลายเดือนก่อน

    It’s because 7x11x13 equals 1001 so say 123x1001 would be 123 and 123,000 added together

  • @Mewse1203
    @Mewse1203 10 หลายเดือนก่อน +1

    345,690,345 is Cooler than just the 345 at the beginning and the end. 690 is also 345x2

  • @manjunaths4839
    @manjunaths4839 ปีที่แล้ว

    because 7x11x13=1001
    when we multiply any three digits number with 1000 the answer will be with 000 there zero example, 455x1000=455,000
    455x1000 + 455x1
    =455,455

  • @derivalz5062
    @derivalz5062 ปีที่แล้ว

    101 × any two digit (ab) will result in a number (abab)
    1001 × any three digit (abc) will result in (abcabc)
    1001× any four digit.... and so on
    Try yourself 101 × three digit, four digit...
    .... 1001× five digit.. and find out the cool stuff yourself

  • @RobertStCyr-zh1tw
    @RobertStCyr-zh1tw ปีที่แล้ว +1

    Cool trick for a kid learning primes numbers to have some fun in school.

  • @lefteriseleftheriades7381
    @lefteriseleftheriades7381 ปีที่แล้ว +4

    From the result i deduced that 7*11*13=1001

  • @user-cx7em3zg3x
    @user-cx7em3zg3x 3 หลายเดือนก่อน

    One lab accident away from being a super villain 😂❤

  • @charleesabankes6250
    @charleesabankes6250 11 หลายเดือนก่อน

    and 7×11×13013×1001=1003003001. Because
    if you take ABC and do the trick thrice, if your number is less than 334, you get ABCDEFDEFABC. Where DEF is a 3 digit number that is ABC × 3. Otherwise the 1st 3 digits won't add up to your non-100-to-333-3-digit integer.

  • @kevinmichael4829
    @kevinmichael4829 ปีที่แล้ว +1

    Love you stuff man. But does any of this have any utility? Or is this just cool math tricks ?

  • @xavierluthenumberblocksfan2424
    @xavierluthenumberblocksfan2424 9 หลายเดือนก่อน

    7*11*13 = 1001
    Suppose your number was ABC, meaning the answer will be ABC000+ABC = ABCABC

  • @tom_something
    @tom_something หลายเดือนก่อน

    I started with 001 as my 3 digit number.

  • @charleesabankes6250
    @charleesabankes6250 11 หลายเดือนก่อน

    7×11×13×1001=1002001.
    That's why if you take 123,246,123 and divive it by 7, then 11, then 13, and then 1001, you get 123.

  • @PJO_fan_
    @PJO_fan_ 9 หลายเดือนก่อน

    And if you do 345+345 you can see at the end that the result is the number in the middle

  • @anthonyepps7339
    @anthonyepps7339 หลายเดือนก่อน

    Do you have it with any 4 digit number.

  • @glub1381
    @glub1381 ปีที่แล้ว

    Doesn't really have anything to do with the primes, just that they multiply to equal 1001

  • @ABC-Projekt
    @ABC-Projekt ปีที่แล้ว +1

    Nice one, thanks!

  • @SanamPatel
    @SanamPatel ปีที่แล้ว +1

    Oh, Indoor.

  • @Raamarajan
    @Raamarajan 11 หลายเดือนก่อน +1

    Very good 💯👏

  • @alvaroalonso2407
    @alvaroalonso2407 9 หลายเดือนก่อน

    7x11x13 IS equal to 1000, so the number IS going to be the number multiplied by 1 thousand and then summed Up the number

  • @emmacatterson
    @emmacatterson 9 หลายเดือนก่อน +1

    I did 891 and for the last number it said 892,782,981 😱

  • @ikyz396
    @ikyz396 ปีที่แล้ว +1

    Use 12345679 x with any numbers you want it will get so cool

  • @darknase
    @darknase 9 หลายเดือนก่อน

    Double round works also for 642

  • @s1l3nttt
    @s1l3nttt ปีที่แล้ว

    The 2nd one isn't random at all, I've seen it in programming, but it starts with a 3 I think

  • @zelking8948
    @zelking8948 ปีที่แล้ว

    The middle number was the two numbers on the side added together

  • @bengi423
    @bengi423 10 หลายเดือนก่อน

    All I heard was "number fifteeeeeen burger king burgeeer, the last thing you want on your burger king burgeeer is somebody else's foooot funguuuus"

  • @shadialmasri6161
    @shadialmasri6161 ปีที่แล้ว

    Also noticed that the middle three digits is the double of the original number

  • @supercrafter7586
    @supercrafter7586 ปีที่แล้ว

    try using 9091 and 101, and pick any 6 digit number instead

  • @tommyordoyne7461
    @tommyordoyne7461 ปีที่แล้ว

    Notice that the center after the second time he did it was twice the original number. This only works if the original number is less than 500.

  • @fulldeck4499
    @fulldeck4499 11 หลายเดือนก่อน

    Theres always a 1 at the beginning and and end, and 1 times x is x

  • @ShanShan-jr5pr
    @ShanShan-jr5pr ปีที่แล้ว

    Wow if u add 345 + 345 it equaled the middle 3 numbers on the calculator 690

  • @Sahil-hh7rq
    @Sahil-hh7rq ปีที่แล้ว

    I want add something
    After second round the middle number is twice of our assumed one

  • @reynoldskynaston9529
    @reynoldskynaston9529 ปีที่แล้ว

    Everyone else is too fast with the answers but 7x11x13= 1001 which is your number times 1000 plus one more of your original number.

  • @EclipsaMyrtenaster
    @EclipsaMyrtenaster ปีที่แล้ว

    All I can hear is "Number 15: Burger King Foot Lettuce"

  • @Teo117
    @Teo117 ปีที่แล้ว

    Can you explain why this works?

  • @sofiandeclercq1818
    @sofiandeclercq1818 9 หลายเดือนก่อน +1

    Yes, because the average youtuber has the math education of a caveman, the attention span of a tik tokker, the dopamine system of a chainsmoker, and thinks numbers will dirty your clothes.
    I should really get a life.

  • @danohanlon8316
    @danohanlon8316 5 หลายเดือนก่อน

    There are loads of these little number curiosities, each of which is in itself very interesting. But what I find much more interesting and which I have not yet seen or heard even mentioned, anywhere, is any clue as to how these number-curiosities are discovered in the first place. - I mean, the possibilities are *infinite*-which suggests that there is at least one such number-curiosity associated with *every* number.
    Is that it?

  • @jonathaneleazarsandiego5329
    @jonathaneleazarsandiego5329 9 หลายเดือนก่อน

    so how do we know we picked the exact number?

  • @kennethabebdroth8513
    @kennethabebdroth8513 8 หลายเดือนก่อน

    Could havw nothing to do with it but I believe when he did it the second time the number in the middle was 2 times the original

  • @Swaylon_Da_Panda
    @Swaylon_Da_Panda 9 หลายเดือนก่อน +2

    Heres a trick,
    Take any number
    Add a 2
    Then subtract the 2
    You will return to your original number

  • @gyaniadmi2347
    @gyaniadmi2347 ปีที่แล้ว

    if I was smart enough to figure this out I wouldn't be watching this.

  • @stewartbugler
    @stewartbugler 9 หลายเดือนก่อน +1

    345 690 345 is strangely the middle is the sum of 345 + 345.

    • @user-pm2xj9st6f
      @user-pm2xj9st6f 8 หลายเดือนก่อน

      That's because he multiplied 345 twice

  • @blueskyla7978
    @blueskyla7978 9 หลายเดือนก่อน

    I had similar answers when I was doing something with exponents. I can't remember what I did now but I was getting the same type of numbers.

  • @geanx5678
    @geanx5678 9 หลายเดือนก่อน

    That’s pretty normal given that you are multiplying by 1001

  • @masterg9792
    @masterg9792 ปีที่แล้ว +1

    doesn't work if you start with "0"
    001x7x11x13=1001 099x7x11x13= 99099

    • @om05472
      @om05472 9 หลายเดือนก่อน

      bro he said 3 digit no.

  • @BackYardScience2000
    @BackYardScience2000 9 หลายเดือนก่อน

    You're multiplying, so you're basically just adding it to itself so many times. Of course it's going to repeat eventually and even show up at the beginning and end a time or two.

  • @MaxBoomingHere
    @MaxBoomingHere ปีที่แล้ว +1

    The middle number 💀

  • @jakelinton4218
    @jakelinton4218 ปีที่แล้ว

    If you just do 7x11x13 lots of times, then it shows rows of Pascal’s triangle

  • @AnandrajM-bh2cl
    @AnandrajM-bh2cl 8 หลายเดือนก่อน +1

    ப்ரோ கால்குலேட்டர் நேம் என்னன்னு சொல்லுங்க

  • @MrMCLvideo
    @MrMCLvideo ปีที่แล้ว +7

    If he just didn't look like he escaped from an insane asylum

  • @nicholassinkovich
    @nicholassinkovich 10 หลายเดือนก่อน

    What is that device in your hand and where are the clocks!?

  • @h0rni_k
    @h0rni_k ปีที่แล้ว

    Didn’t work for me)))
    He said 3 digit number, but didn’t say it had to be from 100 to 999 so I wrote 0,08. Although if you write 0,008 it does indeed work sooo idk, you could also technically use 4 digit numbers

  • @supersayan6318
    @supersayan6318 9 หลายเดือนก่อน

    I didn't know Hans Niemann was good at math too. Since he's so good at math, perhaps he didn't cheat after all.

  • @colinpalmer5458
    @colinpalmer5458 8 หลายเดือนก่อน

    The first 3 primes are 1 2 3. The next three are 5 7 11.

    • @paysonkeown2960
      @paysonkeown2960 8 หลายเดือนก่อน

      1 isn’t a prime number

  • @vivektadpatri7413
    @vivektadpatri7413 ปีที่แล้ว +1

    Overall, you can randomly do anything with any numbers and come up with a weird creepy pattern, lol!

  • @lawrencechrismedenilla3598
    @lawrencechrismedenilla3598 ปีที่แล้ว

    Multiplying by 0 is still the greatest trick. Answer's always the same. 🤷🏻‍♂️

  • @tylertrainz4460
    @tylertrainz4460 9 หลายเดือนก่อน +1

    The middle number is also the original number x2, which is the number of times you’ve gone through the process, which is followed by x3

  • @OneEyedJacker
    @OneEyedJacker 8 หลายเดือนก่อน

    Fundamental theorem of arithmetic. Any number is the product of its prime decomposition.

  • @plaxy100
    @plaxy100 ปีที่แล้ว

    7x11x13 are the prime factors of 1001

  • @user-um9yg3dg4r
    @user-um9yg3dg4r 9 หลายเดือนก่อน

    This trick is explaining very easy. 7x11x13=1001 :)

  • @olintime147
    @olintime147 8 หลายเดือนก่อน +1

    4th prime is 5

  • @leosjoberg9671
    @leosjoberg9671 10 หลายเดือนก่อน

    I picked 000 as my number and it worked!

  • @justathought88
    @justathought88 ปีที่แล้ว +2

    Mmm. Love those primes.

  • @henriquebueno3208
    @henriquebueno3208 10 หลายเดือนก่อน

    Because when you do 7×11×13 is the same thing as 1001

  • @vinigmoura
    @vinigmoura 7 หลายเดือนก่อน

    Also, the number in the middle is the double! Nice