The Super Number 9

Recently, I discovered that an unique number from 0 to 9 while I was driving homeback. The so called special number is NUMBER 9. If you multiply 9 with any number except zero, and add up the every single digits to become one digits. It will end up to be nine again. Confuse??

See the example below:-

9 X 3 = 27 ==> 2 + 7 = 9

9 X 12 = 108 ==> 1 + 0 + 8 =9

9 X 13 = 117 ==> 1 + 1 + 7 = 9

9 X 21 = 189 ==> 1 + 8 + 9= 18 ==> 1 + 8 = 9

.....etc.



Isn't this number very special. I think this is why chinese society call nine as a "Jiu". In chinese meaning longlasting and never end up. That is why the chinese king love number nine also.