Be careful not to mix up **fractions** (to describe a **part** of a whole: half, third, fourth...) and **ordinal numbers** (to describe an **order/rank**: 1st, 2nd, 3rd, 4th...).

For ordinal numbers, see Forming ordinal numbers (1st, 2nd, 10th...)

Look at these examples of fractions:

un tercio

a third

un cuarto

a quarter

dos quintos

two fifths

To express **fractions** in Spanish, you **usually** use both ** cardinal** (un/dos/tres...) and **ordinal** numbers (cuarto/quinto...) the same way as in English (one fifth, two thirds...).

**Note** also that just like in English, the second number is plural if the first is. (dos quinto**s**)

Half and Double

To say half and double we normally use the definite articles** el** and** la**.

La mitad

Half

El doble

Double

Have a look at these examples to see fractions in context:

Me he comido **dos tercios** de la pizza.

I had two thirds of the pizza.

**Un cuarto** de la población votó en contra.

A quarter of the population voted against.

Puse solo **la mitad** de la harina en el bol.

I only put half the (quantity of) flour in the bowl.

Ella tiene **el doble** de hermanos que él.

She has twice as many siblings as he does.

Notice how, as we generally talk about a fraction "of" a whole, you will usually find **"de"** after the fraction.

Bear in mind that to say "half" [of something] you can also use "**medio/media**".

He cortado **medio** melón para nuestra cena.

I cut **half** a melon for our dinner.

He cortado **media** sandía para nuestra cena.

I cut** half** a watermelon for our dinner.

Notice how we use medi**o** when we refer to a masculine noun (e.g., melón) and medi**a** when we refer to a feminine noun (e.g., sandía). It is only possible to use medio/a with singular nouns, not plural nouns:

"Medio pueblo salió a la calle a celebrar la fiesta."

"La mitad del pueblo salió a la calle a celebrar la fiesta."

"La mitad de los jóvenes salió a la calle a celebrar la fiesta."

"Medio/Medios jóvenes salieron a la calle a celebrar la fiesta."

Also notice above how medio/a are** not** followed by "de".

Here is a list of fractions from half to a tenth:

1/2 **la** mitad [de] - medio/-a

1/3 un tercio [de]

1/4 un cuarto [de]

1/5 un quinto [de]

1/6 un sexto [de]

1/7 un séptimo [de]

1/8 un octavo [de]

1/9 un noveno [de]

1/10 un décimo [de]

Here are more examples of fractions:

tres cuartos

three quarters

dos décimos

two tenths

tres octavos

three eighths

un séptimo

one seventh

dos quintos

two fifths

tres cuartos

three quarters

Me he comido **dos tercios** de la pizza.

I had two thirds of the pizza.

un cuarto

a quarter

He cortado **media** sandía para nuestra cena.

I cut** half** a watermelon for our dinner.

**Un cuarto** de la población votó en contra.

A quarter of the population voted against.

un séptimo

one seventh

un tercio

a third

He cortado **medio** melón para nuestra cena.

I cut **half** a melon for our dinner.

El doble

Double

tres octavos

three eighths

Ella tiene **el doble** de hermanos que él.

She has twice as many siblings as he does.

La mitad

Half

dos décimos

two tenths

Puse solo **la mitad** de la harina en el bol.

I only put half the (quantity of) flour in the bowl.