English Ordinal Numbers
To spell ordinal numbers, just add th to cardinal numbers, such as fourth and sixteenth. There are exceptions: first, second, third, fifth, eighth, ninth, and twelfth. When expressed as figures, the last two letters of the written word are added to the ordinal number.

Playing all sound and repeatedly 
01.  first  1st  11.  eleventh  11th  
02.  second  2nd  12.  twelfth  12th  
03.  third  3rd  13.  thirteenth  13th  
04.  fourth  4th  14.  fourteenth  14th  
05.  fifth  5th  15.  fifteenth  15th  
06.  sixth  6th  16.  sixteenth  16th  
07.  seventh  7th  17.  seventeenth  17th  
08.  eighth  8th  18.  eighteenth  18th  
09.  ninth  9th  19.  nineteenth  19th  
10.  tenth  10th  20.  twentieth  20th 
In compound ordinal numbers, only the last figure is written as an ordinal number. For example,
twentyfirst (21st), thirtyfifth (35th). As to numbers 2090, remove the y, and add ieth for ordinal numbers.
twentyfirst (21st), thirtyfifth (35th). As to numbers 2090, remove the y, and add ieth for ordinal numbers.
01.  twentyfirst  21st  11.  fiftieth  50th  
02.  twentysecond  22nd  12.  sixtieth  60th  
03.  twentythird  23rd  13.  seventieth  70th  
04.  twentyfourth  24th  14.  eightieth  80th  
05.  twentyfifth  25th  15.  ninetieth 
90th  
06.  twentysixth  26th  16.  one hundredth  100th  
07.  twentyseventh  27th  17.  one thousandth  1,000th  
08.  twentyeighth  28th  18.  one millionth  1,000,000th  
09.  twentyninth  29th  19.  seventyfifth  75th  
10.  thirtieth  30th  20.  ninetyninth  99th  
11.  thirtyfirst  31st  21.  103rd  
12.  fortieth  40th  22.  532nd 