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Can Anyone Explain This Number 9 Mystery?
07-23-2013, 03:53 PM #1
Ruby Wolf Member
Posts:10,786 Threads:721 Joined:Oct 2012
I'm certainly no math savant...

But why is it and how is it that if we multiply any number with the number 9...

Then add up the individual numbers...

We will end up with the number 9 every time...

Number 9 is the only number that works out this way...

Any amount of 9's can be used and the results will always be the same...

Heres a few examples of what I mean...

9 x 9 = 81 and 8 + 1 = 9

17 x 9 = 153 and 1 + 5 + 3 = 9

852 x 99 = 84,348 and 8 + 4 + 3 + 4 + 8 = 27 and 2 + 7 = 9

Whats mathematically going on?

Why only number 9?

Is 9 a magical number?
07-23-2013, 04:06 PM #2
JayRodney ⓐⓛⓘⓔⓝ
Posts:31,580 Threads:1,443 Joined:Feb 2011
I've noticed that as well. There are other interesting patterns involving multiples of nine:

12345679 x 9 = 111111111
12345679 x 18 = 222222222
12345679 x 81 = 999999999

It's a Kaprekar number. https://en.wikipedia.org/wiki/Kaprekar_number

wonder.gif
07-23-2013, 04:10 PM #3
Ruby Wolf Member
Posts:10,786 Threads:721 Joined:Oct 2012
(07-23-2013, 04:06 PM)JayRodney Wrote:  I've noticed that as well. There are other interesting patterns involving multiples of nine:

12345679 x 9 = 111111111
12345679 x 18 = 222222222
12345679 x 81 = 999999999

No other number works out this way...

For example multiplying the number 8 doesnt end up with 8...

53 x 8 = 424 and 4 + 2 + 4 = 10 not 8...

07-23-2013, 04:19 PM #4
Ruby Wolf Member
Posts:10,786 Threads:721 Joined:Oct 2012
Hmmmm okay this just got even more numerically weird...

Looks like 3's and 6's also end up with 3's and 6's and 9...

For example?!

84 x 6 = 504 and 5 + 0 + 4 = 9

76 x 3 = 228 and 2 + 2 + 8 = 12 and 1 + 2 = 3

66 x 33 = 2,178 and 2 + 1 + 7 + 8 = 18 and 1 + 8 = 9

So if i'm using the correct term...

3's and 6's and 9's are all divisible with and by each other?

And somehow they always equal out to each other?

But 1's and 2's and 4's and 5's and 7's and 8's dont...

Why and how?
07-23-2013, 04:26 PM #5
Ruby Wolf Member
Posts:10,786 Threads:721 Joined:Oct 2012
Okay lets try some without using any 3's and 6's and 9's

8 x 7 = 56 and 5 + 6 = 11 and 1 + 1 = 2

2 x 44 = 88 and 8 + 8 = 16 and 1 + 6 = 7

See what I mean?!

But if we throw in a 3 or a 6 or a 9 anywhere we suddenly end up with 3 or 6 or 9

3 x 44 = 132 and 1 + 3 + 2 = 6

See what I mean?!
07-23-2013, 04:29 PM #6
Octo Mother Superior
Posts:43,362 Threads:1,482 Joined:Feb 2011
07-23-2013, 04:30 PM #7
JayRodney ⓐⓛⓘⓔⓝ
Posts:31,580 Threads:1,443 Joined:Feb 2011
(07-23-2013, 04:19 PM)Beyond Smolensk Wrote:  Hmmmm okay this just got even more numerically weird...

Looks like 3's and 6's also end up with 3's and 6's and 9...

For example?!

84 x 6 = 504 and 5 + 0 + 4 = 9

76 x 3 = 228 and 2 + 2 + 8 = 12 and 1 + 2 = 3

66 x 33 = 2,178 and 2 + 1 + 7 + 8 = 18 and 1 + 8 = 9

So if i'm using the correct term...

3's and 6's and 9's are all divisible with and by each other?

And somehow they always equal out to each other?

But 1's and 2's and 4's and 5's and 7's and 8's dont...

Why and how?


Good question, I'm certain a mathematician could provide an answer to that - but I sure as hell can't. chuckle.gif

wonder.gif
07-23-2013, 04:36 PM #8
Ruby Wolf Member
Posts:10,786 Threads:721 Joined:Oct 2012
(07-23-2013, 04:29 PM)Octo Wrote:  Check this out:

http://en.wikipedia.org/wiki/108_%28number%29

hmm.gif

Thanx for the link...

Right away they explain this using intensely complex words and terms and phrases and each of those have equally complex definitions...

semiperfect number/tetranacci number/hyperfactorial/refactorable number/euclidean space/polyominoes/harshad number...

Wtf?!...just to "try" and explain numbers? and the number 9?

How about number 9 is a magical mystical number with explanations beyond our comprehension?!
07-23-2013, 04:50 PM #9
yankees skier
Posts:5,889 Threads:215 Joined:Feb 2011
9 Players on the field for baseball. coffeetime.gif

Biere.
07-23-2013, 05:00 PM #10
JayRodney ⓐⓛⓘⓔⓝ
Posts:31,580 Threads:1,443 Joined:Feb 2011
Three guys were having drinks at the bar.

The first, bragging about his virility said, "I have four sons, one more and I'll have a basketball team!"

The second one upped him saying, "That's nothing, I have 8 sons, one more and I'll have a baseball team."

The third replied, "Sorry to burst your bubbles, but I have 17 daughters at home, one more and I'll have a golf course!"

coffeetime.gif

wonder.gif
07-23-2013, 05:02 PM #11
yankees skier
Posts:5,889 Threads:215 Joined:Feb 2011
rofl.gifrofl.gifrofl.gif I spit when reading that.

Biere.
07-23-2013, 05:02 PM #12
Octo Mother Superior
Posts:43,362 Threads:1,482 Joined:Feb 2011
chuckle.gif
07-23-2013, 06:06 PM #13
Ruby Wolf Member
Posts:10,786 Threads:721 Joined:Oct 2012
I wonder what 9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 equals?

9 x 9 nine times...

Like...

9 x 9 = 81

81 x 9 = 729

729 x 9 = ?

And so on...
07-23-2013, 06:12 PM #14
Ruby Wolf Member
Posts:10,786 Threads:721 Joined:Oct 2012
I think I found the answer?!

This is the probably the beatles weirdest song...

They could have called it revolution number 0 or 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8...

Or number whatever...

But no...Of course not...

They just had to call it revolution number 9...

Hmmm I wonder why?!

Anonymous Kritter Show this Post
07-23-2013, 06:35 PM #15
Anonymous Kritter Incognito Anonymous
 
wow. did you ever visit a school?



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