# Cardinal Numbers

## Introduction

Cardinal numbers are basic numbers. We use them to count and to indicate how much of something there is.

## Writing of Cardinal Numbers

1 |
one | 11 |
eleven | 21 |
twenty-one | 31 |
thirty-one |

2 |
two | 12 |
twelve | 22 |
twenty-two | 40 |
forty |

3 |
three | 13 |
thirteen | 23 |
twenty-three | 50 |
fifty |

4 |
four | 14 |
fourteen | 24 |
twenty-four | 60 |
sixty |

5 |
five | 15 |
fifteen | 25 |
twenty-five | 70 |
seventy |

6 |
six | 16 |
sixteen | 26 |
twenty-six | 80 |
eighty |

7 |
seven | 17 |
seventeen | 27 |
twenty-seven | 90 |
ninety |

8 |
eight | 18 |
eighteen | 28 |
twenty-eight | 100 |
one hundred |

9 |
nine | 19 |
nineteen | 29 |
twenty-nine | 1,000 |
one thousand |

10 |
ten | 20 |
twenty | 30 |
thirty | 1,000,000 |
one million |

### Tens

In British English we put an *and *between the hundreds and the tens (110). If there are no tens (2,001), we put the *and* before the single digits. We can leave the *and *out in American English.

- Example:
- 110 – one hundred and ten

(*American English:*one hundred ten) - 1,250 – one thousand, two hundred and fifty

(*American English:*one thousand, two hundred fifty) - 2,001 – two thousand and one

(*American English:*two thousand one)

### Hundreds

We put *a* or *one* before the number 100, but only at the beginning of a number (*a* is colloquial).

- Example:
- 100 – a hundred/one hundred
- 2,100 – two thousand, one hundred

### Thousands and Millions

The same rule applies for *a* and *one* with thousands and millions as with hundreds.

- Example:
- 1,000 – a thousand/one thousand
- 201,000 – two hundred and one thousand

### To note:

Thousands are separated by commas in English.

- Example:
- 57,458,302 – fifty-seven thousand, four hundred and fifty-eight thousand, three hundred and two

### One Billion, Trillion etc.

The words *billion, trillion etc. *refer to different numbers in different languages. In English,* one billion* has 9 zeroes and* one trillion *has 12 zeroes.

- Example :
- one million = 1,000,000 (6 zeroes)
- one billion = 1,000,000,000 (9 zeroes)
- one trillion = 1,000,000,000,000 (12 zeroes)
- one quadrillion = 1,000,000,000,000,000 (15 zeroes)
- one quintillion = 1,000,000,000,000,000,000 (18 zeroes)