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One, two, three … are cardinal numbers.
First, second, third … are ordinal numbers.
You can normally create ordinal numbers by adding -TH to the end of a cardinal number.
>>4 - Four – Fourth
>>16 - Sixteen – Sixteenth
The main exceptions are with the numbers 1, 2, and 3.
>>one – first
>>two – second
>>three – third
Also you need to be careful with the spelling of some ordinal numbers:
>>five – fifth (not “fiveth“)
>>nine – ninth (not “nineth“)
When do we use ordinal numbers?
Ordinal numbers are normally used for:
→Her birthday is on the 29th. (Twenty-ninth)
→Their Independence Day is on the 4th of July. (Fourth of July)
→I came third in the race. This is the first time it has happened.
→Our office is on the ninth floor.
→She lives on the second floor.
→A person’s 15th birthday is an important celebration in Mexico.
→He had a huge party for his twenty-first birthday.
→Shakespeare was born in the 16th century.
→The 20th century saw two great wars, the World War I and World War II.
> Let’s practice:
- What day of the month is it today?
- What day of the month was it yesterday?
- When is your birthday? Do you commemorate this day?
- When is your wedding/dating anniversary?
- When is your mother’s birthday?
- When is your father’s birthday?
- What day is your favorite holiday?
- What is a holiday you don’t like? What day is it?
- Did you have a big party for your 15th birthday? How was it?
- Did you have a big party for your 18th birthday? How was it?
- When is Independence day commemorated in Brazil?
- When is Independence day commemorated in the U.S.A.?
- In which floor do you live?
- In which floor do you work?
- What century is it now?
- In what century were you born?
- Did you pass the driving exam the first try?
- Did you pass ‘vestibular’ the first try?
- Complete the sentence: “I am my parents’ ______(first/second/…) child.”
- Complete the sentence: “I came in ______(first/second/…) in my school’s _________(math/football/…) competition.”
→ https://agendaweb.org/exercises/vocabulary/days-months-seasons/date-day-month
→ https://agendaweb.org/exercises/vocabulary/numbers/ordinals-1-100
→ http://www.adelescorner.org/vocab/the_date/date2.html
→ https://agendaweb.org/exercises/vocabulary/numbers/ordinal-numbers-1-100
→ http://www2.arnes.si/~oskksavokl2/dates1.htm