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,
twenty-first (21st), thirty-fifth (35th). As to numbers 20-90, remove the y, and add -ieth for ordinal numbers.
01.
twenty-first 21st 11.
fiftieth 50th
02.
twenty-second 22nd 12.
sixtieth 60th
03.
twenty-third 23rd 13.
seventieth 70th
04.
twenty-fourth 24th 14.
eightieth 80th
05.
twenty-fifth 25th 15.
ninetieth
90th
06.
twenty-sixth 26th 16.
one hundredth 100th
07.
twenty-seventh 27th 17.
one thousandth 1,000th
08.
twenty-eighth 28th 18.
one millionth 1,000,000th
09.
twenty-ninth 29th 19.
seventy-fifth 75th
10.
thirtieth 30th 20.
ninety-ninth 99th
11.
thirty-first 31st 21.
103rd  
12.
fortieth 40th 22.
532nd  
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