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Table of Cardinal Numbers

Cardinal numbers from 1 through 1,000,000

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).

Hundreds

Use 100 always with 'a' or 'one'.
'a' can only stand at the beginning of a number.

Thousands and Millions

Use 1,000 and 1,000,000 always with 'a' or 'one'.
Use commas as a separator.

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.
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).