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1、基數詞：表示數目多少。

1 one 11 eleven 21 twenty-one

2 two 12 twelve 22 twenty-two

3 three 13 thirteen 30 thirty

4 four 14 fourteen 40 forty

5 five 15 fifteen 50 fifty

6 six 16 sixteen 60 sixty

7 seven 17 seventeen 70 seventy

8 eight 18 eighteen 80 eighty

9 nine 19 nineteen 90 ninety

10 ten 20 twenty 100 hundred

注意：數字“0”可以讀作“zero”，也可以讀作字母“o”。

2、序數詞：表示順序先后。

1st first 11th eleventh 21st twenty-first

2nd second 12th twelfth 22nd twenty-second

3rd third 13th thirteenth 30th thirtieth

4th fourth 14th fourteenth 40th fortieth

5th fifth 15th fifteenth 50th fiftieth

6th sixth 16th sixteenth 60th sixtieth

7th seventh 17th seventeenth 70th seventieth

8th eighth 18th eighteenth 80th eightieth

9th ninth 19th nineteenth 90th ninetieth

10th tenth 20th twentieth 100th hundredth

基數詞變序數詞記憶口訣：

一、二、三，需要記，八去t，九省e，ve結尾時，f來代替，

ty結尾時，y變ie，再加th，若是幾十幾，前基后序別忘記。