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 Topic: Nine is a mind-boggling number. Find out why.

 (Read 4692 times)
  • 1« Previous thread | Next thread »
  • Nine is a mind-boggling number. Find out why.
     OP - February 14, 2009, 06:15 AM

    Multiple - A multiple of an integer is the product of that integer with another integer.

    For example:

    49 is a multiple of 7 because 7 x 7 = 49

    32 is a multiple of 4 because 4 x 8 = 32

    Now here's the fun part.

    The sum of the individual numbers of any multiple of 9 will ALWAYS add up to 9.

    72 is a multiple of 9. 7 + 2 = 9

    63 is a multiple of 9. 6 + 3 = 9

    54 is a multiple of 9. 5 + 4 = 9

    Let's try a bigger multiple.

    7,137 is a multiple of 9. (793 multiplied by 9)

    7 + 1 + 3 + 7 = 18

    I know what you're thinking. ?It doesn't add up to 9!?

    Just take a step further and you'll have it.

    7 + 1 + 3 + 7 = 18

    1 + 8 = 9

    Now let's try an even bigger multiple of 9.

    4,921,915,617 is a multiple of 9. (546,879,513 multiplied by 9)

    4 + 9 + 2 + 1 + 9 + 1 + 5 + 6 + 1 + 7 = 45

    4 + 5 = 9
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #1 - February 14, 2009, 06:28 AM
    What is 9 x 205?
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #2 - February 14, 2009, 06:33 AM
    Okay. Pick any number you want and multiply it by 9.
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #3 - February 14, 2009, 06:40 AM
    Yes I know. It's a characteristic of decimal systems. If we used an octal system or a hexadecimal system it wouldn't be applicable.
    Devious, treacherous, murderous, neanderthal, sub-human of the West. bunny
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #4 - February 14, 2009, 06:51 AM
    Quote from: osmanthus on February 14, 2009, 06:40 AM
    Yes I know. It's a characteristic of decimal systems. If we used an octal system or a hexadecimal system it wouldn't be applicable.


    Yes, that's true. I just want to see if I can do it with any number multiplied by nine to see if I understand it correctly.

    Math is not my strong point.
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #5 - February 14, 2009, 07:01 AM
    You can. As an example take 5,986,987,235,643,674,263,095,905,023,564.

    If you multiply that by nine and add up the numbers it will reduce to nine.
    Devious, treacherous, murderous, neanderthal, sub-human of the West. bunny
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #6 - February 14, 2009, 07:20 AM
    I came across this while playing with my calculator some time ago. Its quite fascinating.. and fun Cheesy


    Quod est inferius est sicut quod est superius,
    et quod est superius est sicut quod est inferius,
    ad perpetranda miracula rei unius.
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #7 - February 14, 2009, 07:25 AM
    Mathematics is fascinating. Wait until you get into trig functions. Cheesy
    Devious, treacherous, murderous, neanderthal, sub-human of the West. bunny
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #8 - February 14, 2009, 09:37 PM
    Quote from: osmanthus on February 14, 2009, 07:25 AM
    Mathematics is fascinating. Wait until you get into trig functions. Cheesy


    I don't even know what a trig is....but I do know what a Tigger is. Does that count?
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #9 - February 14, 2009, 09:47 PM
    http://en.wikipedia.org/wiki/Trigonometry

    Tiggers is different.
    Devious, treacherous, murderous, neanderthal, sub-human of the West. bunny
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #10 - February 14, 2009, 09:51 PM
    Quote from: osmanthus on February 14, 2009, 07:25 AM
    Mathematics is fascinating. Wait until you get into trig functions. Cheesy

    I think trig is so mysterious. I can do them just fine but I still haven't got the slightest clue how the calculator gets SIN or COSINE or TANGENT. It just works the magic and gives me the numbers. Amazing.
    "Poor human nature, what horrible crimes have been committed in thy name!"
    - Emma Goldman
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #11 - February 14, 2009, 10:25 PM
    Quote from: osmanthus on February 14, 2009, 09:47 PM
    http://en.wikipedia.org/wiki/Trigonometry

    Tiggers is different.


    It all looks Greek to me. sad
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #12 - February 15, 2009, 03:44 PM
    Quote from: osmanthus on February 14, 2009, 07:25 AM
    Mathematics is fascinating. Wait until you get into trig functions. Cheesy




    Pi is an irrational number. This means that it cannot be expressed as the quotient of any two whole numbers, and that it goes on forever, in no obvious pattern (3.14159265...)

    "i" is called imaginary. It is defined as the square root of negative one (I'll be writing sqrt(-1) for this). Now, why would anyone call sqrt(-1) irrational? Well, think of what a square is: it is a number multiplied by itself. Now, can you think of any number that, when multiplied by itself, gives a negative number? Let's try: a positive times a positive = a positive. A positive times a negative = a negative. But that's not a number multiplied by itself, is it? 2 time -2 is not 2 times 2, right? And finally, any negative times a negative equals a positive.

    So, how that's why we call i, which is sqrt(-1), "imaginary" - because according to our "common sense" there's no number that really can be the sqrt(-1).

    I hope this helped.

    I was not blessed with the ability to have blind faith. I cant beleive something just because someone says its true.
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #13 - February 15, 2009, 04:55 PM
    Quote from: Shaneequa on February 14, 2009, 09:37 PM
    Quote from: osmanthus on February 14, 2009, 07:25 AM
    Mathematics is fascinating. Wait until you get into trig functions. Cheesy


    I don't even know what a trig is....but I do know what a Tigger is. Does that count?


    Tigger's busy eating his dinner, don't bother him with maths at the moment. 
    "Befriend them not, Oh murtads, and give them neither parrot nor bunny."  - happymurtad's advice on trolls.
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #14 - February 15, 2009, 05:10 PM
    Quote from: Cheetah on February 15, 2009, 04:55 PM
    Quote from: Shaneequa on February 14, 2009, 09:37 PM
    Quote from: osmanthus on February 14, 2009, 07:25 AM
    Mathematics is fascinating. Wait until you get into trig functions. Cheesy


    I don't even know what a trig is....but I do know what a Tigger is. Does that count?


    Tigger's busy eating his dinner, don't bother him with maths at the moment. 


    LOL. Me too.
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #15 - February 15, 2009, 05:32 PM
    Quote from: osmanthus on February 14, 2009, 07:25 AM
    Mathematics is fascinating. Wait until you get into trig functions. Cheesy


    Allow trig functions.
    Have to remember all the fucking identities.

    And integrating trig is a bitch. There are too many ways to do it and too many chances to make a schoolboy error.

    My maths teacher called it "death". Even he hates it.  Cheesy
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #16 - February 18, 2009, 06:31 PM
    Is trigonometry something like this?

    http://www.youtube.com/watch?v=GVqfceBdcoA&feature=related
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #17 - February 18, 2009, 08:44 PM
    Quote from: Shaneequa on February 18, 2009, 06:31 PM
    Is trigonometry something like this?

    http://www.youtube.com/watch?v=GVqfceBdcoA&feature=related


    Doesnt look like it.
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #18 - February 18, 2009, 09:07 PM
    Quote from: MSinghK on February 18, 2009, 08:44 PM
    Quote from: Shaneequa on February 18, 2009, 06:31 PM
    Is trigonometry something like this?

    http://www.youtube.com/watch?v=GVqfceBdcoA&feature=related


    Doesnt look like it.


    There are triangles, tetrahedrons, other kinds of hedrons and pi and stuff....
  • Re: Nine is a mind-boggling number. Find out why.
     Reply #19 - February 18, 2009, 09:13 PM
    Quote from: Shaneequa on February 18, 2009, 09:07 PM
    Quote from: MSinghK on February 18, 2009, 08:44 PM
    Quote from: Shaneequa on February 18, 2009, 06:31 PM
    Is trigonometry something like this?

    http://www.youtube.com/watch?v=GVqfceBdcoA&feature=related


    Doesnt look like it.


    There are triangles, tetrahedrons, other kinds of hedrons and pi and stuff....


    Might be a more advanced form of trig but Im talking about the sin cos tan sec cosec and cot stuff. Trig identities like double angle forumlas and sin sqaured theta+cos squared theta= 1
  • 1« Previous thread | Next thread »