Cardinal numbers – Exercise 529

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Cardinal numbers — short reference

Number	In words	Comments
1	one	to be remembered
2	two
3	three
4	four
5	five
6	six
7	seven
8	eight
9	nine
10	ten
11	eleven
12	twelve
13	thirteen	end with -teen
14	fourteen
15	fifteen
16	sixteen
17	seventeen
18	eighteen
19	nineteen
20	twenty	round tens end with -ty
21	twenty-one	a hyphen between tens and ones
89	eighty-nine	a hyphen between tens and ones
101	one hundred and one	and after hundred
999	nine hundred and ninety-nine	and after hundred
1,234	one thousand two hundred and thirty-four	a comma after every 3 digits counting from the right do not add and after thousand, million, billion
2,400,560	two million four hundred thousand five hundred and sixty
3,648,820,115	three billion six hundred and forty-eight million eight hundred and twenty thousand one hundred and fifteen