The Magic Number - Nine

  • Posted by a hidden member.
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    Apr 21, 2012 3:14 AM GMT
    It seems if you multiply 9 by anything, it will become 9 if you add all the numbers in the sum.

    9x1=9
    9x2=18, add 1+8=9
    9x3=27, add 2+7=9
    9x4=36, add 3+6=9
    9x5=45, add 4+5=9
    9x6=54, add 5+4=9
    9x7=63, add 6+3=9
    9x8=72, add 7+2=9
    9x9=81, add 8+1=9
    9x10=90, add 9+0=9
    9x11=99, add 9+9=18, add 1+8=9
    9x12=108, add 1+0+8=9

    Okay, this could go on forever...so what happens if we multiply 9 by a big random number? Let's try 4334. That can't possibly add up to 9. it's got to stop somewhere!

    9 x 4334 = 39006, add 3+9+0+0+6=18, add 1+8=9

    Still not convinced?

    Let's try an even longer number: 1332586

    This one is over 1 million! If this doesn't break it, nothing will!

    9 x 1332586 = 11993274

    Let's add 1+1+9+9+3+2+7+4. The answer is 36. Then we add 3+6 and we get 9.



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    Apr 21, 2012 3:22 AM GMT
    9x0=0
    0+0 does not equal 9

    myth busted
    icon_biggrin.gif
  • Posted by a hidden member.
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    Apr 21, 2012 3:25 AM GMT
    Claystation said9x0=0
    0+0 does not equal 9

    myth busted
    icon_biggrin.gif


    0 doesn't count.icon_wink.gif
  • Posted by a hidden member.
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    Apr 21, 2012 3:27 AM GMT
    Yes huh, you said multiply nine by anything, 0 is a number. Don't try and ignore the zero icon_mad.gif
    icon_razz.gif
  • Posted by a hidden member.
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    Apr 21, 2012 3:55 AM GMT
    Do imaginary numbers count?
  • Posted by a hidden member.
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    Apr 21, 2012 3:56 AM GMT
    That's pretty legit. Math is cool sometimes.
  • turtleneckjoc...

    Posts: 4685

    Apr 21, 2012 3:56 AM GMT
    flatstate2010 saidDo imaginary numbers count?


    No, but he's been playing with his intiger and inserted a digit into his polynomial.
  • monet

    Posts: 1093

    Apr 21, 2012 3:59 AM GMT
    9 x 1.5 = 13.5

    9 x 2.54 = 22.86

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    Apr 21, 2012 4:02 AM GMT
    monet said9 x 1.5 = 13.5

    9 x 2.54 = 22.86



    Then you add the numbers in the sum. 13.5 , add 1+3+5= 9

    22.86, add 2+2+8+6=18, then add 1+8=9

  • Posted by a hidden member.
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    Apr 21, 2012 4:08 AM GMT
    MOTD saidIt seems if you multiply 9 by anything, it will become 9 if you add all the numbers in the sum.

    9x1=9
    9x2=18, add 1+8=9
    9x3=27, add 2+7=9
    9x4=36, add 3+6=9
    9x5=45, add 4+5=9
    9x6=54, add 5+4=9
    9x7=63, add 6+3=9
    9x8=72, add 7+2=9
    9x9=81, add 8+1=9
    9x10=90, add 9+0=9
    9x11=99, add 9+9=18, add 1+8=9
    9x12=108, add 1+0+8=9


    Also fun to note...
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    Apr 21, 2012 4:17 AM GMT
    onaquest said
    MOTD saidIt seems if you multiply 9 by anything, it will become 9 if you add all the numbers in the sum.

    9x1=9
    9x2=18, add 1+8=9
    9x3=27, add 2+7=9
    9x4=36, add 3+6=9
    9x5=45, add 4+5=9
    9x6=54, add 5+4=9
    9x7=63, add 6+3=9
    9x8=72, add 7+2=9
    9x9=81, add 8+1=9
    9x10=90, add 9+0=9
    9x11=99, add 9+9=18, add 1+8=9
    9x12=108, add 1+0+8=9


    Also fun to note...



    wow. That's awesome. I didn't even notice that. icon_smile.gif
  • Posted by a hidden member.
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    Apr 21, 2012 4:45 AM GMT
    Also with three (3)...
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    Apr 21, 2012 5:00 AM GMT
    JPtheBITCH saidweirder still:

    7 - 1 + 2 + 4

    1/7 = 0.142857
    2/7 = 0.285714
    3/7 = 0.428571
    4/7 = 0.571428
    5/7 = 0.714285
    6/7 = 0.857142

    The first decimal. 0.142857 is in the ratio of 1:2:4 (14=2x7, 28=4x7, 56-8x7, with a round up for repeating).

    All of these decimals repeat to infinity.


    Math rocks!
  • Posted by a hidden member.
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    Apr 21, 2012 6:04 AM GMT
    infinitely repeating digits
    1/9 .11111111
    2/9 .22222222
    3/9 .33333333
    4/9 .44444444

    Dressed to the nines.

    The whole nine yards

    Possession is nine points of the law

    The nine worthies

    The nine muses

    ...the ninth hour, jesus cried.....My God, why has Thou forsaken me?

    ....when Abram was ninety and nine years old, the Lord appeared and said...walk before me and be thou perfect.

    Thrice to thrice and thrice to mine
    And thrice again to make up nine.

    number nine number nine number nine number nine

    http://en.wikipedia.org/wiki/Centriole
    a cylindrical shaped cell structure...usually composed of nine triplets of microtubules

    DeHarven.gif

    Most of above from
    51T5sjJ-TqL._BO2,204,203,200_PIsitb-stic
    (I added the Beatles)
  • Posted by a hidden member.
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    Apr 21, 2012 7:04 AM GMT
    theantijock saidinfinitely repeating digits
    1/9 .11111111
    2/9 .22222222
    3/9 .33333333
    4/9 .44444444

    Dressed to the nines.

    The whole nine yards

    Possession is nine points of the law

    The nine worthies

    The nine muses

    ...the ninth hour, jesus cried.....My God, why has Thou forsaken me?

    ....when Abram was ninety and nine years old, the Lord appeared and said...walk before me and be thou perfect.

    Thrice to thrice and thrice to mine
    And thrice again to make up nine.

    number nine number nine number nine number nine

    http://en.wikipedia.org/wiki/Centriole
    a cylindrical shaped cell structure...usually composed of nine triplets of microtubules

    DeHarven.gif

    Most of above from
    51T5sjJ-TqL._BO2,204,203,200_PIsitb-stic
    (I added the Beatles)


    99 beads on the muslim rosary (9 x 11 or 3 x 33 and 33 = age of jesus at death)

    108 beads on the hindu rosary (9 x 12 = 3 x 3 x 3 x 2 x 2 = 3 to the power of 3 times 2 to the power of 2 )

    number of secoinds in an hour = 60 x 60 = 3600 = divisible by 9 (3+6+0+0=9)
  • calibro

    Posts: 8888

    Apr 21, 2012 7:04 AM GMT
    √2 X 9 = 9√2

    √2 + 9 = 10.41421356237309504880168872420969807856967187537694807317667973799073247846210703885038753432764157273501384623091229702492483605585073721264412149709993583141322266592750559275579995050115278206057147010955997160597027453459686201472851741864088919860955232923048430871432145083976260362799525140989687253396546331808829640620615258352395054745750287759961729835575220337531857011354374603408498847160386899970699004815030544027790316454247823068492936918621580578463111596668713013015618568987237235288509264861249497715421833420428568060146824720771435854874155657069677653720226485447015858801620758474922657226002085584466521458398893944370926591800311388246468157082630100594858704003186480342194897278290641045072636881313739855256117322040245091227700226941127573627280957381089675040183698683684507257993647290607629969413804756548237289971803268024744206292691248590521810044598421505911202494413417285314781058036033710773091828693147101711116839165817268894197587165821521282295184884720896946338628915628276595263514054226765323969461751129160240871551013515045538128756005263146801712740265396947024030051749531886292563138518816347800156936917688185237868405228783762938921430065586956868596459515550164472450983689603688732311438941557665104883914292338113206052433629485317049915771756228549741438999880217624309652065642118273167262575395947172559346372386322148274262220867115583959992652117625269891754098815934864008345708518147223181420407042650905653233339843645786579679651267292399875366617215982578860263363617827495994219403777753814262177387991945513972312740668983299898953867288228563786774966251996658352577619893932284534473569479496295216889148925389047558288345260965240965428893945386466257449275563819410316979833061852019379384940057156333720548068540575867999701213722394758214263065851322174088323829472876173936474678374319600015921888073478576172522118674904249...

    basically, it won't work with irrational numbers, which represent the vast majority of numbers.
  • Posted by a hidden member.
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    Apr 21, 2012 7:06 AM GMT
    NINETY-NINE BARRELS OF BEER ON THE WAAALL !! 99 BARRELS OF BEEEER !!!
  • Posted by a hidden member.
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    Apr 21, 2012 9:20 AM GMT
    Cloud 9
    Cat's lives
    Agent 99

    111111111 x 111111111 = 12345678987654321
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    Apr 21, 2012 9:24 AM GMT
    MOTD said
    onaquest said
    MOTD saidIt seems if you multiply 9 by anything, it will become 9 if you add all the numbers in the sum.

    9x1=9
    9x2=18, add 1+8=9
    9x3=27, add 2+7=9
    9x4=36, add 3+6=9
    9x5=45, add 4+5=9
    9x6=54, add 5+4=9
    9x7=63, add 6+3=9
    9x8=72, add 7+2=9
    9x9=81, add 8+1=9
    9x10=90, add 9+0=9
    9x11=99, add 9+9=18, add 1+8=9
    9x12=108, add 1+0+8=9

    Also fun to note...

    wow. That's awesome. I didn't even notice that. icon_smile.gif

    What? Didn't anybody teach you the trick where you look at your open hands and hold down one of your fingers to work out what the result would be if you multiplied that number by 9... ?
    9timesfingers.jpg
  • Posted by a hidden member.
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    Apr 21, 2012 11:56 AM GMT
    Fine, I'll be 6; you be 9!icon_mad.gif Jeez!!icon_twisted.gif Did you really have to make a big stink of it?icon_rolleyes.gif
    5 + 9 + 1 + 7 = 22 = 2 + 2 = 4?
    5 x 9 x 1 x 7 = 315 = 3 + 1 + 5 = 9?
    5 - 9 - 1 - 7 = (-12) = (-1) + (-2) = -3?
    5/9/1/7 = 0.07936507936/omg/wtf/not going there... correct me, please! icon_wink.gif
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    Apr 21, 2012 12:45 PM GMT
    In the simple case, we easily prove your rule algebraically. Suppose x
    is any single-digit number; then

    9x = (10-1)x

    = 10x - x

    This almost looks like the expanded form of a decimal number, except
    that the digits would have to be x and -x, and we can't have negative
    digits. So we can "borrow," adding 10 to the units digit and taking 1
    from the tens digit:

    9x = 10x - x

    = 10(x-1) + (10-x)

    This tells us that the tens digit is x-1, and the units digit is 10-x.
    In your example with x = 4, these are 4-1 = 3 and 10-x = 6 (making the
    number 36).

    But what is the sum of the digits?

    (x-1) + (10-x) = 9


    From 'Ask Dr. Math' at http://mathforum.org/library/drmath/view/57189.html:
  • SkyMiles

    Posts: 963

    Apr 21, 2012 12:55 PM GMT
    Mind = *blown*!
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    Apr 21, 2012 12:58 PM GMT
    The most interesting math lesson I've had in my 27 years of living.

    No, seriously. I actually read the whole thing and understood it... which helps icon_smile.gif I'm SO bad with numbers.
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    Apr 21, 2012 1:22 PM GMT
    Warning! Nerd alert!
    I love math. This video isn't about the number nine, but it's pretty interesting anyway icon_smile.gif

  • Posted by a hidden member.
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    Apr 21, 2012 1:34 PM GMT
    I wonder if the writer of the movie "The Nines" knew this.