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

30 thirty
40 forty
50 fifty
60 sixty
70 seventy
80 eighty
90 ninety
100 one hundred / a hundred

21 twenty-one
32 thirty-two
43 forty-three
54 fifty-four
etc.

101 one hundred and one / a hundred and one
110 one hundred and ten / a hundred and ten
123 one hundred and twenty-three / a hundred and twenty-three
250 two hundred and fifty
etc.