Cardinal Numbers
Cardinal numbers are ordinary numbers like 1, 2, 3. In the chart below, you can see how we make numbers from 0 to 100 and then some units above that. You can hear how we say some of these numbers in this numbers song.
The numbers from 13 (thirteen) to 19 (nineteen) all end in teen and are called the teens. This is why people from thirteen to nineteen years of age are called teenagers.
Arabic numeral  word 

0  zero, nought 
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  twentyone 
22  twentytwo 
23  twentythree 
24  twentyfour 
30  thirty 
31  thirtyone 
40  forty 
50  fifty 
60  sixty 
70  seventy 
80  eighty 
90  ninety 
100  one hundred 
101  one hundred and one 
152  one hundred and fiftytwo 
200  two hundred 
1,000  one thousand 
1,000,000  one million 
1,000,000,000  one billion 
1,000,000,000,000  one trillion 
 British English: 120 = one hundred and twenty
 American English: 120 = one hundred twenty
In American English, and now in British English, a billion has nine zeros (so, one billion = one thousand million). Before, in British English one billion had twelve zeros (one million million).
In American English, and now in British English, a trillion has twelve zeros (so, one trillion = one million million). Before, in British English one trillion had eighteen zeros (one million million million).
American English and British English 
Some other languages and "old" British English 


million  1,000,000  1,000,000 
billion  1,000,000,000  1,000,000,000,000 
trillion  1,000,000,000,000  1,000,000,000,000,000,000 