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Interesting facts about 9

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Shampa Iftakhar:
1. If you multiply nine by any whole number (except zero), and repeatedly add the digits of the answer until it's just one digit, you will end up with nine:
2 × 9 = 18 (1 + 8 = 9)
3 × 9 = 27 (2 + 7 = 9)
9 × 9 = 81 (8 + 1 = 9)
121 × 9 = 1089 (1 + 0 + 8 + 9 = 18; 1 + 8 = 9)
234 × 9 = 2106 (2 + 1 + 0 + 6 = 9)
578329 × 9 = 5204961 (5 + 2 + 0 + 4 + 9 + 6 + 1 = 27 (2 + 7 = 9))
482729235601 × 9 = 4344563120409 (4 + 3 + 4 + 4 + 5 + 6 + 3 + 1 + 2 + 0 + 4 + 0 + 9 = 45 (4 + 5 = 9))
(Exception) 0 x 9 = 0 (0 is not equal to 9)

2. The sum of the digits of the number added to 9 is always equal to the sum of the digits of the result. Take any four digit number and try the trick. Ex: 9 + 17 = 26. 1 + 7 = 8 & 2 + 6 = 8
3. Nine judges sit on the United States Supreme Court.
5.A standard work day of 9 to 5 begins at 9 a.m.

source: answers.yahoo.com › ... › Education & Reference › Homework Help‎

Antara11:
So interesting!

Tahsina:
Well, I am so poor at maths that even I get mental blockage at this simple kind of equations!
I need to subtract 280 from 500, to see if the change returned to me by the CNG driver is correct or not.  :P

R B Habib:
Wao! What an equation!

Hahhhaa.......:) Tahsina Apu. May be because you run all the time and are busy with so many things. MashAllah

Shampa Iftakhar:
I am always very poor at Math. But you know I have to teach my son every evening. Then one evening I found time table of 9 is really interesting. Then I started searching  on net and came to know about many facts of 9.

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