Nominal to Ordinal
Say the date
100

18

Eighteenth

100
Valentine's Day

February 14th

200

22

Twenty-second


200
Christmas

December 25th

300

30

Thirtieth

300
Costa Rica's Independence Day

September 15th


400
83

Eighty-third

400

Halloween

October 31st


500

15

Fifteenth

500

Tomorrow

July 10th
M
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