treinta

/TRAYN-tah/

thirty

Visualizing treinta as a quantity: thirty objects.

treinta(Adjective)

InvariableA1

thirty

number/quantity

Also:

numeral

📝 In Action

Mi abuelo tiene treinta años.

My grandfather is thirty years old.

Necesitamos treinta sillas para la reunión.

We need thirty chairs for the meeting.

El viaje dura treinta minutos.

The trip lasts thirty minutes.

Word Connections

Common Collocations

treinta por ciento – thirty percent
treinta y uno – thirty-one

💡 Grammar Points

Always the Same Form

Unlike the numbers 'uno' or 'cien,' the word 'treinta' never changes its form to match the gender (masculine or feminine) of the thing you are counting.

❌ Common Pitfalls

Writing Higher Numbers

Mistake: "Escribir treinta y uno (writing it as one word)."

Correction: Numbers from 31 to 99 are written as three separate words: 'treinta y uno'. Only numbers 16 through 29 are usually one word (e.g., 'dieciséis', 'veinticinco').

⭐ Usage Tips

Pronunciation Tip

The 'tr' sound in 'treinta' is often a single, rolled sound at the beginning of the word, similar to the 'tt' in the English word 'butter' if pronounced quickly in some accents.

An illustration showing three separate, distinct stacks of ten identical blue building blocks each, symbolizing the mathematical value of thirty.

Visualizing treinta as a mathematical value: three groups of ten, representing the number thirty.

treinta(Noun)

mA2

the number thirty

mathematical value

Also:

the age of thirty

referring to a person's age

the thirties

decade or age range (often used in plural: 'los treinta')

📝 In Action

El treinta es un número par.

Thirty is an even number.

Ella está en sus treinta y se siente genial.

She is in her thirties and feels great.

Necesito el autobús treinta para ir al centro.

I need the number thirty bus to go downtown.

💡 Grammar Points

Referring to Age

When talking about someone's age range (the decade of life), Spanish uses the masculine plural form with the article: 'los treinta' (the thirties).

✏️ Quick Practice

💡 Quick Quiz: treinta

Question 1 of 2

Which sentence correctly uses 'treinta'?

📚 More Resources

Word Family

treintena(a group of thirty) - noun

treintañero(person in their thirties) - noun

Frequently Asked Questions

How do I write numbers like 31, 32, 33?

Unlike numbers 16 through 29, which are typically one word (e.g., diecisiete), numbers from 31 up are written as three separate words: 'treinta y uno', 'treinta y dos', 'treinta y tres', and so on.