# Grade-1 Math – Ordinal Numbers Worksheet #2

##### Ordinal Numbers

Ordinal numbers are used to indicate the position of objects relative to others.

Examples:

⇒⇒ Our school is the first in the city.

⇒⇒ My parents are celebrating their tenth anniversary.

⇒⇒ History books are on the second shelf from the top.

###### How to Write Ordinal Numbers

Ordinal numbers have letters on them, just like an exponential number. These letters are the last two letters of the ordinal number.

1st → First

2nd → Second

3rd → Third

The ones coming after the first three ordinal numbers are a little easier to learn and write. We add -th to the numbers following the first three ordinal numbers. But, there are some exceptions:

Examples:

⇒⇒ Five → Fifth

⇒⇒ Twelve → Twelfth

∗  Another ordinal number we should pay attention to is the eight. Since eight already ends with the letter -t, we get the eighth number by adding -h without adding -t again.

⇒⇒ Eight → Eighth

When we want to get ‘ninth’,  we drop the -e at the end of the nine and add -th.

⇒⇒ Nine → Ninth

In numbers ending with the letter -y, -y is dropped and -ieth is added to convert it to an ordinal number. We can see this in number 20 and subsequent tens.

⇒⇒ Twenty → Twentieth

⇒⇒ Thirty → Thirtieth

The digits between the tens are expressed as the cardinal number in the first part and the ordinal number in the second part.

⇒⇒ 21st →  Twenty-first

⇒⇒ 32nd → Thirty-second