11 (number) facts for kids
Quick facts for kids
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|---|---|---|---|---|
| Cardinal | eleven | |||
| Ordinal | 11th (eleventh) |
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| Factorization | prime | |||
| Prime | 5th | |||
| Divisors | 1, 11 | |||
| Greek numeral | ΙΑ´ | |||
| Roman numeral | XI | |||
| Greek prefix | hendeca-/hendeka- | |||
| Latin prefix | undeca- | |||
| Binary | 10112 | |||
| Ternary | 1023 | |||
| Senary | 156 | |||
| Octal | 138 | |||
| Duodecimal | B12 | |||
| Hexadecimal | B16 | |||
| Hebrew numeral | יא | |||
This article is about the number eleven. For the year, see 11.
11 (or eleven) is a special number. It comes right after ten and just before twelve. Eleven is an odd number, meaning you can't divide it evenly by two. It is also a prime number. This means its only divisors are 1 and itself.
Contents
What Makes 11 a Prime Number?
A prime number is a whole number greater than 1 that has only two divisors: 1 and itself. For example, you can only divide 11 by 1 or by 11 to get a whole number.
Other Prime Numbers Before 11
Eleven is the fifth prime number in counting order. The prime numbers that come before 11 are:
How Do We Use the Number 11?
The number 11 appears in many places in our daily lives and in different subjects.
In Sports and Games
- In soccer, each team has 11 players on the field at the start of a game.
- In American football, each team also has 11 players on the field during a play.
- In cricket, a team has 11 players.
In Time and Dates
- There are 11 months until December in a year.
- The 11th hour of the day is 11:00 AM or 11:00 PM.
In Science and Math
- The chemical element sodium has an atomic number of 11.
- In geometry, an hendecagon is a shape with 11 sides.
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11 (number) Facts for Kids. Kiddle Encyclopedia.