Table 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 | a/one hundred |
| 9 | nine | 19 | nineteen | 29 | twenty-nine | 1,000 | a/one thousand |
| 10 | ten | 20 | twenty | 30 | thirty | 1,000,000 | a/one million |
Separation between hundreds and tens
Hundreds and tens are usually separated by 'and' (in American English 'and' is not necessary).
110 - one hundred and ten
1,250 - one thousand, two hundred and fifty
2,001 - two thousand and one
Hundreds
Use 100 always with 'a' or 'one'.
100 - a hundred / one hundred
'a' can only stand at the beginning of a number.
100 - a hundred / one hundred
2,100 - two thousand, one hundred
Thousands and Millions
Use 1,000 and 1,000,000 always with 'a' or 'one'.
1,000 - a thousand / one thousand201,000 - two hundred and one thousand
Use commas as a separator.
57,458,302
Singular or Plural?
Numbers are usually written in singular.
two hundred Euros
several thousand light years
The plural is only used with dozen, hundred, thousand, million, billion, if they are not modified by another number or expression (e.g. a few / several).
hundreds of Euros
thousands of light years
