•
•

## The Magic Number - Nine

• Posted by a hidden member.
It seems if you multiply 9 by anything, it will become 9 if you add all the numbers in the sum.

9x1=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!

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

• Posted by a hidden member.
9x0=0
0+0 does not equal 9

myth busted

• Posted by a hidden member.
Claystation said9x0=0
0+0 does not equal 9

myth busted

0 doesn't count.
• Posted by a hidden member.
Yes huh, you said multiply nine by anything, 0 is a number. Don't try and ignore the zero

• Posted by a hidden member.
Do imaginary numbers count?
• Posted by a hidden member.
That's pretty legit. Math is cool sometimes.
• turtleneckjoc...

Posts: 4685
flatstate2010 saidDo imaginary numbers count?

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

Posts: 1120
9 x 1.5 = 13.5

9 x 2.54 = 22.86

• Posted by a hidden member.
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

• Posted by a hidden member.
MOTD saidIt seems if you multiply 9 by anything, it will become 9 if you add all the numbers in the sum.

9x1=9

Also fun to note...
• Posted by a hidden member.
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

Also fun to note...

wow. That's awesome. I didn't even notice that.
• Posted by a hidden member.
Also with three (3)...
• Posted by a hidden member.
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.
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

Most of above from

• Posted by a hidden member.
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

Most of above from

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
√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.
NINETY-NINE BARRELS OF BEER ON THE WAAALL !! 99 BARRELS OF BEEEER !!!
• Posted by a hidden member.
Cloud 9
Cat's lives
Agent 99

111111111 x 111111111 = 12345678987654321
• Posted by a hidden member.
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

Also fun to note...

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

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... ?
• Posted by a hidden member.
Fine, I'll be 6; you be 9! Jeez!! Did you really have to make a big stink of it?
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!
• Posted by a hidden member.
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
Mind = *blown*!
• Posted by a hidden member.