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CARDINAL NUMBERS

0    zero, oh, nought, nil, love, nothing
1    one
2    two
3    three
4    four
5    five
6    six
7    seven
8    eight
9    nine
10   ten
11   eleven
12   twelve
13   thirteen
14   fourteen
15   fifteen
16   sixteen
17   seventeen
18   eighteen
19   nineteen
20   twenty
21   twenty-one
22   twenty-two
23   twenty-three
24   twenty-four
25   twenty-five		 26   twenty-six
27   twenty-seven
28   twenty-eight
29   twenty-nine
30   thirty
40   forty  (no "u")
50   fifty
60   sixty
70   seventy
80   eighty
90   ninety
100   a/one hundred
101   a hundred and one
110   a hundred and ten
120   a hundred and twenty
200   two hundred
1,000   a/one thousand
1,001   a thousand and one
1,010   a thousand and ten
2,000   two thousand
10,000   ten thousand
11,000   eleven thousand
100,000   a/one hundred thousand
1,000,000   a/one million
2,000,000   two million
1,000,000,000   a/one billion

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 thousand
201,000 - two hundred and one thousand

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 in English, 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 'a thousand 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 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

ORDINAL NUMBERS

1 st first 11 th eleventh 21 st twenty-first 31 st thirty-first
2 nd second 12 th twelfth 22 nd twenty-second 40 th fortieth
3 rd third 13 th thirteenth 23 rd twenty-third 50 th fiftieth
4 th fourth 14 th fourteenth 24 th twenty-fourth 60 th sixtieth
5 th fifth 15 th fifteenth 25 th twenty-fifth 70 th seventieth
6 th sixth 16 th sixteenth 26 th twenty-sixth 80 th eightieth
7 th seventh 17 th seventeenth 27 th twenty-seventh 90 th ninetieth
8 th eighth 18 th eighteenth 28 th twenty-eighth 100 th one hundredth
9 th ninth 19 th nineteenth 29 th twenty-ninth 1,000 th one thousandth
10 th tenth 20 th twentieth 30 th thirtieth 1,000,000 th one

Spelling of Ordinal Numbers

Just add th to the cardinal number:

Exceptions:

In compound ordinal numbers, note that only the last figure is written as an ordinal number:

Figures

When expressed as figures, the last two letters of the written word are added to the ordinal number:

Titles

In names for kings and queens, ordinal numbers are written in Roman numbers. In spoken English, the definite article is used before the ordinal number:

The Figure 0

Teacher at the blackboard nought - in general (British English), in mathematics (AmE: zero)
  zero - in general (American English).
Termometer   - in measurements of temperature (British and American English)
5, 4, 3, 2, 1, 0   - in count-downs (British and American English)
Football   - score in team games, e.g. football (American English)
Telephone rings oh - when each figure is said separately (e.g. in phone numbers, account numbers etc.)
Goalkeeper nil - score in team games, e.g. football (British English)
Tennis racket and tennis ball love - in tennis and similar games
1. How many fingers do you have?
2. You have eight fingers?
3. How many brothers does Ryan have?
4. How many students in your class?
5. How old is your sister?
6. How many hours do you work every day?
7. How many people are in the group?
8. How many cookies are left?
9. How many toothpicks are in the box? 		I have eight fingers.
Eight fingers and two thumbs.
He has four (brothers).
Thirty-five, including me.
She is seventeen.
From nine to five. Eight hours.
About seventy.
Five or six.
More than a hundred.

Fractional numbers

½ a half 0.5 British English nought point five
American English zero point five
2½ two and a half 2.5 two point five
¼ a/one quarter 0.25 British English nought point two five
American English zero point two five
¾ three quarters
American English also three fourths		 0.75 British English nought point seven five
American English zero point seven five
1/8 One eighth
1/5 One fifth
1/3 One third
2/3 Two thirds