文档介绍：我们常见的数字所对应的基数词和序数词分别为： 
 
 基数词
 
  序数词
 0
  zero
 
  
 1
  one
 1st
  first
 2
  two
 2nd
  second
 3
  three
 3rd
  third
 4
  four
 4th
  fourth
 5
  five
 5th
  fifth
 6
  six
 6th
  sixth
 7
  seven
 7th
  seventh
 8
  eight
 8th
  eighth
 9
  nine
 9th
  ninth
 10
  ten
 10th
  tenth
 11
  eleven
 11th
  eleventh
 12
  twelve
 12th
  twelfth
 13
  thirteen
 13th
  thirteenth
 14
  fourteen
 14th
  fourteenth
 15
  fifteen
 15th
  fifteenth
 16
  sixteen
 16th 
  sixteenth
 17
  seventeen
 17th 
  seventeenth
 18
  eighteen
 18th   
  eighteenth
 19
  nineteen
 19th 
  nineteenth
 20
  twenty
 20th 
  twentieth
 21
  twenty-one
 21st 
  twenty-first
 30
  thirty
 30th 
  thirtieth
 40
  forty
 40th 
  fortieth
 50
  fifty
 50th 
  fiftieth
 60
  sixty
 60th 
  sixtieth
 70
  seventy
 70th 
  seventieth
 80
  eighty
 80th 
  eightieth
 90
  ninety
 90th 
  ninetieth
 100
  a hundred
 100th 
  hundre