ordinal numbers

Numbers are used for

• counting

• order thing

• both counting and order thing

Answer explanation

Numbers are used to counting and order things. Depending on how they are used, they are known in different ways.

Sarah goes first and Peter second.

First shows the position or quantity

• quantity

• position

Answer explanation

We use ordinal numbers to define the position of an element within a sequential order.

Henry V – Henry the Fifth

Elisabeth I- Elisabeth the First

number shows

• quantity

• To define the position

Answer explanation

I live on the (fourth / four )floor.

• fourth

• four

Who is the best scientist of (the twenty/20th )century?

• twenty

• the 20 th

Answer explanation

To indicate a century and the floor of a building.

Ex: Who is the best scientist of the 20th century?

Ex: I live on the fourth floor.

It’s their (twelve/twelfth )wedding anniversary.

• twelve

• twelfth

Answer explanation

To indicate the anniversary year of something or someone.

Ex: It’s their twelfth wedding anniversary.

Ex: Paola’s birthday is on 7th August.

It’s the /five/5th of June.

• five

• the fifth

I am (twenty /20th)years old.

• twenty

• 20th

Answer explanation

To say your age use cardinal numbers

The museum was opened on 25th June 2008

• 25th+verb

• 25th + noun

It is my (ninth/nineth )birthday.

• ninth

• nineth

Answer explanation

Generally, ordinal numbers are created by adding -th to the end of the cardinal number. However, there are exceptions for the numbers one (first), two (second), three (third), five (fifth), eight (eighth), nine (ninth), and twelve (twelfth).