Cardinal and Ordinal numbers

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Cardinal and ordinal orders

Cardinal Numbers 

Tellen...... one, two, three.....!!!

Study the numbers 

3

11

12

18

25

68

99

Ordinal numbers

What are ordinal numbers? 

3.35

Ordinal numbers

Ordinal numbers are: 

A thing's position or order in a series. 

When to use ordinal numbers? 

• position
• floor
• school grade
• date and so on. 

Examples

How do you write ordinal numbers?

Most ordinal numbers are created by adding a 'th' to the end of the number. 

Example : Four -> Fourth

Seven -> Seventh

Ten -> Tenth

For the words that 'th' does not fit, we use either 'st' or 'nd'. 

This may sometimes change the start of the word too. 

Here are some examples:

'st' is for the first position, but we don't say onest as it is an exception to the rule. 

• One-first
• Two-second
• Three-third
• Five-fifth
• Eight-eighth
• Nine-ninth

• Twelve-twelfth

Example phrases

My birthday is February 15th.

The library is on the third floor.

He’s in the sixth grade.

I came second in the race.

January is the first month of the year.

My brother was first in line to buy the new iphone.

First, fold the piece of paper in half. Second, fold the piece of paper again.

Big numbers

The 'ten's after tenth (20,30,40,50) are written as their cardinal number (normal counting number) replacing the 'y' with an 'ieth' at the end of the word.

Twenty - Twentieth

Thirty - Thirtieth

Forty - Fortieth

Fifty - Fiftieth

agendaweb.org

agendaweb.org