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. Only about one ninth of the mass of an iceberg is visible above the water. Nearly all its bulk remains hidden beneath the surface.

3. On cloud nine means happy, euphoric or `high'. The phrase came into use in the 1950s from a term used by the US Weather Bureau. For the meteorologists Cloud Nine is cumulo-nimbus cloud at a height of 10 km, which is high even by the standard of clouds.

4. The 9 of diamonds - the playing card - is sometimes called the Curse of Scotland.

5. The expression to the nines means to the highest degree. Someone dressed "to the nines" is dressed up as much as they can be.

6. 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

7. In French the word neuf means both nine and new. In German, the words for nine and new are neun and neu, and in Spanish, nueve and nuevo. As you count and reach nine, you know you are about to make a new start.

8. Nine judges sit on the United States Supreme Court.

9. Nine Eleven is the day of the attacks on the World Trade Center, New York, USA.

10. Nine months is the average number of months per school year that most primary and secondary students are required to attend.

11. A human pregnancy ordinarily lasts for nine months.

12. There are nine members of the Fellowship of the Ring in The Lord of the Rings saga, to balance and combat the nine Nazgûl, or Ringwraiths.

13. Important Buddhist rituals usually involve nine monks.

14. A batting lineup in baseball consists of nine players. In addition, 9 represents the number of innings in a game.

15. A standard work day of 9 to 5 begins at 9 a.m.

16. It is easy to work out whether a number is exactly divisible by 9. This is the same as asking whether a number is in the "9 times table". All you have to do is add up its digits. If the answer is more than one digit long, you add up the digits again, and go on doing this, until you are left with a single digit. If this single digit is 9 then the original number was divisible by 9.

For example, is 781236 divisible by 9? Adding up its digits 7 + 8 + 1 + 2 + 3 + 6 = 27- and adding again 2 + 7 = 9. And because the answer is 9, the original number must be divisible by 9.

17. The formula for determining the sum of interior angles of a polygon is n-2(180). n= number of sides. The sum of all angles of any polygon will always equal 9. A 9-sided polygon is 9-2(180) or 7(180) or 1260. 1+2+6+0 = 9. Try it with any sided polygon.

18. Any random number (e.g 35967930) when arranged with its integers in a descending order (i.e. 99765330) and subtracted from it the reverse number with rearranged integers in an ascending order ( i.e 03356799) the resulting subtraction (i.e. 96408531) individual integers when added (i.e 36) leads to a multiple of number 9.

Examples:

2- Digit Numbers: 10-01 = 9 (9X1); 21-12 = 9; 32-23 = 9; 43-34 = 9; 54-45 = 9; 65-56 = 9; 76-67 = 9; 87-78 = 9; 98-89 = 9;

3-Digit Numbers: 210-012 = 198 (1+9+8 = 18 = 9X2; 321-123 = 198; 432-234 = 198; 543-345 = 198; 654-456 = 198; 765-567 = 198; 876-678 = 198; 987-789 = 198;

4-Digit Numbers: 3210-0123 = 3087 (3+0+8+7 = 18 = 9X2); 4321-1234 = 3087; 5432-2345 = 3087; 6543-3456 = 3087; 7654-4567 = 3087; 8765-5678 = 3087; 9876-6789 = 3087;

5-digit Numbers: 43210-01234 = 41976 (4+1+9+7+6 = 27 = 9X3); 54321-12345 = 41976; 65432-23456 = 41976; 76543-34567 = 41976; 87654-45678 = 41976; 98765-56789 = 41976;

6- digit numbers: 543210 - 012345 = 530865 (5+3+0+8+6+5 = 27 = 9X3; 654321 - 123456 = 530865 = 27; 765432 - 234567 = 530865 = 27; 876543 - 345678 = 530865 = 27; 987654 - 456789 = 530865 = 27;

7- digit numbers: 6543210 - 0123456 = 6419754 (6+4+1+9+7+5+4 = 36 = 9X4); 7654321 - 1234567 = 6419754; 8765432 - 2345678 = 6419754; 9876543 - 3456789 =6419754;

8-digit numbers: 76543210 - 01234567 = 75308643 (7+5+3+0+8+6+4+3 = 36 = 9X4; 87654321 - 12345678 = 75308643 98765432 - 23456789 = 75308643

9-digit numbers: 876543210 -012345678 = 864197532 (8+6+4+1+9+7+5+3+2 = 45 =9X5) 987654321 -123456789 = 864197532;

10-digit numbers: 9876543210 -0123456789 = 9753086421 (9+7+5+3+0+8+6+4+2+1) = 45 = 9X5); 9988664432 -2344668899 = 7643995533 (7+6+4+3+9+9+5+5+3+3) = 54 =9X6).

19. In Egyptian mythology, there are nine major gods and goddesses. The ancient Egyptians believed that a person had to earn the right to enter the afterlife. Before an individual could pass into the next realm, nine great gods known collectively as the enneagon had to judge his worthiness.

20. A 9-sided polygon is called a enneagon.

21. Before 2006 (when Pluto was officially designated as a non-planet), there were nine planets in the solar system.

22. On a numeric keypad or calculator, the numbers from left to right and top to bottom are...

789 - row 1456 - row 2123 - row 3

If you add up the totals of each row you get... row1 is 7 + 8 + 9 =24, row2 is 4 + 5 + 6 =15, row3 is 1 + 2 + 3 =6 The difference between each sum is 9. (24 - 15 = 9 or 15 – 6 = 9)

23. Nine is strongly associated with the Chinese dragon, a symbol of magic and power. There are nine forms of the dragon, it is described in terms of nine attributes, and it has nine children.

24. In Thai, the word for nine, 'gao', is the same as the verb for 'to develop or progress'.

25. In astrology, the ninth sign of the Zodiac is Sagittarius, identified by the Greeks as a centaur. Centaurs are magical creatures known for their skills as archers, philosophers, and predictors of the future.

26. In classical music the curse of the ninth refers to the superstition that a composer who writes a ninth symphony will die soon. Beethoven, who left his Tenth Symphony unfinished, is regarded by the superstition as the first victim of the curse.

27. The Beatles released a song called "Revolution 9" which appears on The White Album (more properly known as The Beatles); its principle vocal feature is a voice repeating, "Number nine...number nine...number nine..." John Lennon, the primary composer of "Revolution 9", also released a solo recording entitled "#9 Dream". The Beatles also released a song called "One After 909" in 1970, although it was recorded in 1969, and Lennon and McCartney had worked on it since the very early days. Lennon is known to have felt a connection with the number 9. Both he and his son, Sean were born on October 9th. Also, John died on the 9th (UK Time). Ironically, of all the Beatles' singles that made the U.S. Top 10 in Billboard, all peak positions were covered except #9.

28. The whole nine yards has a few possible origins, but a common thought of it's origin is that tailors use nine yards of material to make top quality suits.

29. There are 360 degrees in a circle. 3 + 6 + 0 = 9.

30. The earth rotates 15 degrees per hour through 24 different time zones, 1 per hour. 24 – 15 = 9. 24 x 15 = 360 or a full rotation.