0 — zero, 1 — one, 2 — two, 3 — three, 4 — four, 5 — five, 6 — six, 7 — seven, 8 — eight, 9 — nine, ...

0 — zero,
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 — a / one hundred,
200 — two hundred,
300 — three hundred, …

1,000 — a / one thousand;
8,000 — eight thousand;
200,000 — two hundred thousand; …

1,000,000 — a / one million;
6,000,000 — six million;

121 — one hundred and twenty one (books);

7,006 — seven thousand and six.