Cardinal And Ordinal Numbres

Cardinal and Ordinal Numbers

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 50fifty
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-seven90 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 thirty1,000,000 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 - onethousand, 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 - ahundred / 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 thousand
201,000 - two hundred and onethousand
Use commas as a separator.
57,458,302

The Number 1,000,000,000
In English this number is a billion. This is very tricky for nations where 'a billion' has 12 zeros. 1,000,000,000,000 inEnglish, however, is a trillion.
But don't worry, these numbers are even a bit problematic for native speakers: for a long time the British 'billion' had 12 zeros (a number with 9 zeros was called 'athousand million'). Now, however, also in British English 'a billion' has 9 zeros. But from time to time this number still causes confusion (just like this paragraph, I'm afraid). ;o)

Singular orPlural?
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...