Cats are said to be lucky and have “nine lives.” The expression “to the nines” means to the highest degree, such as “She had a talent to the nines.” Likewise, the phrase “on cloud nine” means that someone is very happy and content.
A polygon is a shape that has nine angles. A shape with nine sides is called a nonagon. A “palindromic” word has the same sequence of letters backwards and forwards. In the English language the word “redivider” is the longest palindromic word. It has nine letters.
To find out if a number is exactly divisible by nine add up its digits. If the answer is more than one digit long, add up the digits again, and go on doing this, until only a single digit is left. If this single digit is 9 then the original number was divisible by 9.
Below is a list of five facts about the number nine: