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How Does This Math Trick Work?

Discussion in 'BBS Hangout' started by Lil Pun, Jan 30, 2004.

  1. Lil Pun

    Lil Pun Member

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    1. Grab a calculator. (you won't be able to do this one in your head)
    2. Key in the first three digits of your phone number (NOT the area code)
    3. Multiply by 80 and press 'equal' key
    4. Add 1 and press 'equal' key
    5. Multiply by 250 and press 'equal' key
    6. Add the last 4 digits of your phone number and press 'equal' key
    7. Add the last 4 digits of your phone number again. and press 'equal' key
    8. Subtract 250 and press 'equal' key
    9. Divide number by 2 and press 'equal' key


    Do you recognize the answer?
     
  2. annthuyn

    annthuyn Member

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    that's friggen awesome! :D
     
  3. mrpaige

    mrpaige Member

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    I don't know how it works, but I'm embarrassed that I had to think for a minute before I could remember what my phone number was.
     
  4. ZRB

    ZRB Member

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    Un-bloody-believable.
     
  5. wizkid83

    wizkid83 Member

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    if the first three numbers of the answer was suppose to be the last three digit of you phone number than I think it's kind of lame. Basically you're mutiplying the 3 numbers by 1 thousand (step 3, 5, and 9) and every onther step really doesn't do much to the numbers since they are << than the final answerr.
     
  6. AroundTheWorld

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    Basically, you do enter the whole phone number, they just kinda mess around with it which causes the nice little effect.
     
  7. Blatz

    Blatz Member

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    That's cool.
     
  8. nyquil82

    nyquil82 Member

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    where'd you get this you sneaky little hobbit?
     
  9. Buck Turgidson

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    Mebbe you should have picked a different user name? ;)
     
  10. Buck Turgidson

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    I understand everything except how the "plus 1" and "minus 250" fit into the equation...
     
  11. wizkid83

    wizkid83 Member

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    Ok, just think of the the first 3 numbers as A and the last 4 as B.
    So step 4 - 5 you have (80A + 1)250.

    The result is 2000A + 250 then you add 2B which would make it

    2000A + 250 + 2B. subtracting the 250 gives you 2000A + 2B.

    Divid everything by two

    and you will have A * 10^3 + B which is basically entering your phone number.
     
  12. wizkid83

    wizkid83 Member

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    sorry it sould've be to the powers of four instead of 3.

    i.e. 20000 A + 250 leading to 10000A + B
     
  13. Baqui99

    Baqui99 Member

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    The 250 is multiplied by 1, and later subtracted.

    Meanwhile, the 250*80, is meant to move the first three digits to the left by 2e4, later divided by 2.

    example

    {250[ABC(80)+1]+WXYZ+WXYZ-250}/2

    = {2*ABCe4 + 250 + 2*WXYZ - 250}/2

    = ABCe4 + WXYZ
     
  14. wizkid83

    wizkid83 Member

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    yeah, lol, i read the instructions slightly wrong but i hope my last post redeemed my self :D
     
  15. rrj_gamz

    rrj_gamz Member

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    Your a genius...I'm glad you did it before I started to think about how it works...
     
  16. Falcons Talon

    Falcons Talon Member

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    Try this one

    1. Click on "Post Reply" button.

    2. Type you complete phone number, area code included.

    3. Click on "Submit Reply"

    4. Wait.






































    :D
     
  17. PhiSlammaJamma

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    Good job breaking down. Thats makes it easy to understand.
     
  18. meggoleggo

    meggoleggo Member

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    512-***-****



    now what am I waiting for?
     
  19. AMS

    AMS Member

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    Doesnt work for me:confused:

    274 - 0520

    Dont try calling its not Houston. :D
     

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