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# Ordinal numbers

## Vocabulary

## 1. *Ordinal numbers*

*indicate the position that an element occupies within an ordered series. These numbers can be expressed in words (first, second...) or in an abbreviated form (1st, 2nd...)*

**Ordinal numbers**## 2. One-digit numbers

The first three numbers have the endings * -st*,

*,*

**-nd***.*

**-rd**However, from the fourth onwards, we will take the cardinal number and we will add the ending * -th* to it.

CARDINAL NUMBER

ORDINAL NUMBER

## 3. Aspects to be taken into account

In the * tens* ending in

*, the*

**zero***is replaced by an*

**-y***and then the ending*

**-i***is added.*

**-eth**CARDINAL NUMBER

ORDINAL NUMBER

In the tens containing numbers 1, 2 and 3 we will add the ordinals first, second and third to them respectively.

CARDINAL NUMBER

ORDINAL NUMBER

Numbers

**11**,**12**and**13**do not follow the same pattern. They end in**-th**:I live on the eleventh floor.

Her birthday is on twelfth of August.

## 4. How are *ordinal numbers* used?

- To define the
of an element within a**position**.**sequential order**

- How is the race going?-*Pedrosa first, Márquez second.* - With
, to indicate the specific**dates**.**day of a month**

- What day is it today?*- Today is the 7*^{th}of August. - To indicate a
or one of the levels in a building (**century**).**floor**

This is the best invention of the 19^{th}century.John's room is on the seventh floor. - To indicate the
of something or someone.**anniversary year**

- What are they celebrating?- Their fiftieth wedding anniversary. - To refer to a
,**king**or**queen**.**pope**

- Who is that woman?- Elizabeth II Elizabeth the Second.

When we refer to kings, queens and popes in written, we usually use

*, but we***roman numerals***them like an***pronounce***.***ordinal number**### Remember!

The first three numbers have the endings * -st*,

*and*

**-nd***:*

**-rd**The other numbers adopt the ending* -th*:

It should be noted that the * tens *ending in

*adopt the*

**zero***ending:*

**-ieth**Numbers containing units **1**,** 2**, **3** will keep the endings * first*,

*and*

**second***respectively:*

**third**Except for numbers **11**, **12** and **13**, which follow the pattern below: