1～12 的基數詞和序數詞分別如下：one firsttwo secondthree thirdfour forthfive fifthsix sixthseven seventheight eighthnine ninthten tenth13～19 的基數詞以 3～9 為詞根加字尾 -teen，序數詞是在基數詞後面加字尾 -th，個別詞的拼寫略有變化，如：thirteen thirteenthfifteen fifteentheighteen eighteenth20 和 30 的基數詞或序數詞分別如下：twenty twentieththirty thirtieth二十幾和三十幾的基數詞和序數詞分別在 twenty 和 thirty 後加 1～9 的基數詞和序數詞，例如：21 twenty-one twenty-first 39 thirty-nine thirty-ninth其他同。

以下左為基數詞，右為對應的序數詞：

1:one— first2:two— second3:three— third4:four-fourth5:five— fifth6:six— sixth7:seven— seventh8:eight— eighth9:nine— ninth10:ten— tenth

11:eleven— eleventh

12:twelve— twelfth

13:thirteen— thirteenth

14:fourteen— fourteenth

15:fifteen— fifteenth

16:sixteen— sixteenth

17:seventeen— seventeenth

18:eighteen— eighteenth

19:nineteen— nineteenth

20:twenty— twentieth

21:twenty-one— twentieth-first

22:twenty-two— twentieth-second

23:twenty-three— twentieth-third

24:twenty-fuor— twentieth-fourth

25:twenty-five— twentieth-fifth

26:twenty-six— twentieth-sixth

27:twenty-seven— twentieth-seventh

28:twenty-eight— twentieth-eighth

29:twenty-nine—twentieth-ninth

30:thirty—thirtieth