Here's a quick instruction and practice session for learning and remembering ordinal numbers:

Instruction:

Ordinal numbers represent the position or order of something in a series. For example, first, second, third, etc.

Ordinal numbers are often used to indicate the rank of people, places, or objects.

In English, most ordinal numbers end in "th," such as fourth, fifth, sixth. However, there are a few exceptions like first, second, and third.

Start by familiarizing yourself with the first ten ordinal numbers:

First

Second

Third

Fourth

Fifth

Sixth

Seventh

Eighth

Ninth

Tenth

Here's the structure of ordinal numbers above ten:

11th - Eleventh

12th - Twelfth

13th - Thirteenth

14th - Fourteenth

15th - Fifteenth

16th - Sixteenth

17th - Seventeenth

18th - Eighteenth

19th - Nineteenth

20th - Twentieth

21st - Twenty-first

22nd - Twenty-second

23rd - Twenty-third

24th - Twenty-fourth

25th - Twenty-fifth

26th - Twenty-sixth

27th - Twenty-seventh

28th - Twenty-eighth

29th - Twenty-ninth

30th - Thirtieth

31st - Thirty-first

32nd - Thirty-second

33rd - Thirty-third

34th - Thirty-fourth

35th - Thirty-fifth

36th - Thirty-sixth

37th - Thirty-seventh

38th - Thirty-eighth

39th - Thirty-ninth

40th - Fortieth

And so on...

The general rule for forming ordinal numbers is to add "th" to most numbers, but there are a few exceptions like first, second, and third, as mentioned earlier.

Practice

Now, let's practice using these ordinal numbers in sentences. Fill in the blanks with a correct ordinal number:

"She won the race and finished in ______ place."

"The concert is on the ______ of June."

"He is the ______ person in line."

"We live on the ______ floor of the building."