first     1st   eleventh    11th   twenty-first    21st

second    2nd   twelfth     12th   twenty-second   22nd

third     3rd   thirteenth  13th   twenty-third    23rd

fourth    4th   fourteenth  14th   twenty-fourth   24th

fifth     5th   fifteenth   15th   twenty-fifth    25th

sixth     6th   sixteenth   16th   twenty-sixth    26th

seventh   7th   seventeenth 17th   twenty-seventh  27th

eighth    8th   eighteenth  18th   twenty-eighth   28th

ninth     9th   nineteenth  19th   twenty-ninth    29th

tenth    10th   twentieth   20th   thirtieth       30th 

thirty-first  31st