The ordinal number for 9 is Ninth.
Understanding Ordinal Numbers
Ordinal numbers are a type of number that indicates the position or order of something in a sequence, such as first, second, third, and so on. They are distinct from cardinal numbers (like one, two, three), which simply denote quantity. Ordinal numbers are essential for describing ranks, dates, and the sequence of items.
How Ordinal Numbers Are Formed
Most ordinal numbers are formed by adding "-th" to the end of the cardinal number. However, there are specific rules and irregular forms, especially for the numbers 1, 2, and 3, and numbers ending in these digits. For instance:
- 1 becomes first
- 2 becomes second
- 3 becomes third
- 4 becomes fourth
- 5 becomes fifth
The number 9 is an example of an irregular formation, as it changes from "nine" to "ninth" by dropping the 'e' before adding 'th', rather than becoming "nineth."
Here is a table illustrating common ordinal numbers:
| Cardinal Number | Ordinal Number |
|---|---|
| 1 | First |
| 2 | Second |
| 3 | Third |
| 4 | Fourth |
| 5 | Fifth |
| 6 | Sixth |
| 7 | Seventh |
| 8 | Eighth |
| 9 | Ninth |
| 10 | Tenth |
| 11 | Eleventh |
| 12 | Twelfth |
| 13 | Thirteenth |
| 14 | Fourteenth |
| 15 | Fifteenth |
| 16 | Sixteenth |
| 17 | Seventeenth |
| 18 | Eighteenth |
| 19 | Nineteenth |
| 20 | Twentieth |
When Do We Use Ordinal Numbers?
Ordinal numbers are used in various contexts to specify order or position:
- Dates: "Today is May ninth."
- Rankings: "She finished ninth in the marathon."
- Floors of a building: "His office is on the ninth floor."
- Sequences: "Please turn to the ninth chapter of the book."
- Centuries: "The nineteenth century."
Example of 'Ninth' in Use
The word "ninth" is commonly used to indicate the position after eighth and before tenth. For example:
- "The ninth symphony by Beethoven is a masterpiece."
- "He celebrated his ninth birthday with a big party."
For further information and examples of ordinal numbers, you can refer to educational resources on ordinal numbers.
