Imagine if learning to count in a new language was like playing with Lego blocks. In Spanish, once you learn a few basic bricks, you can snap them together to say almost any number up to 100 instantly!
Words to own
- uno, dos, tres
- One, two, three (the foundation blocks for all other Spanish numbers).
- diez
- Ten (the first double-digit milestone).
- quince
- Fifteen (the last of the unique 'teen' words before a clear pattern begins).
- dieciséis
- Sixteen (literally 'ten and six', showing how the 'teen' numbers are squished into one word).
- veinte
- Twenty (the starting block for the twenties family).
- treinta
- Thirty (the first 'tens' word that begins the three-word pattern).
- y
- And (the spelling connector used between tens and ones from 31 to 99).
- cien
- One hundred (the ultimate milestone number).
The First Steps: 1 to 10
Counting to ten in Spanish is like practicing a musical scale. These ten little words are your super-bricks. You will use them over and over again to build much larger numbers.
Let's practice the rhythm: uno, dos, tres, cuatro, cinco, seis, siete, ocho, nueve, diez. Say them aloud until they feel completely natural on your tongue!
- Step 1
Step 1: Identify the Tens
Find the base word for your tens, such as 'cuarenta' (40) or 'ochenta' (80).
- Step 2
Step 2: Add the Connector
For numbers 31 to 99, write 'y' (and) as a separate middle word.
- Step 3
Step 3: Add the Ones
Put your single digit at the end, like 'tres' (3) or 'siete' (7).
- Step 4
Step 4: Check for Twenties
If your number is 16-29, remember to squish it into one word (like 'veintidós') instead of three separate ones.
Phrase deck
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The Rebel Teens: 11 to 15
Numbers 11 to 15 are the rebels of the Spanish number family. They do not like patterns, so they each have their own unique names: once, doce, trece, catorce, and quince.
They might seem tricky at first, but here is a secret: they all end in the letters '-ce'. Once you memorize these five, the rules get much easier!
The pattern
Word Squishing: The 'y' Rule
Numbers 16-29 are combined into single words using 'i', while numbers 31-99 are written as three separate words using 'y'.
- 16 (one word, 'y' becomes 'i', accent on the 'e')
- 22 (one word, 'e' turns to 'i', accent on the 'o')
- 31 (three separate words)
- 47 (three separate words)
- 99 (three separate words)
The Word-Squishers: 16 to 29
From 16 onwards, a cool math pattern kicks in. Instead of inventing new words, Spanish starts combining them. For 16, they take 'diez' (10) and 'seis' (6) and squish them together.
When they squish them, the 'z' in diez turns into a 'c', and the 'y' (and) turns into an 'i' to make 'dieciséis'. The exact same squishing trick happens in the twenties, so 22 becomes 'veintidós'. They are always written as one single word!
The Three-Word Pattern: 31 to 99
Once you hit 31, the squishing stops and a perfectly consistent rule takes over. You do not merge the words anymore. Instead, you write three separate words: [Tens] + y + [Ones].
For example, to write 47, you take forty (cuarenta), add the word for 'and' (y), and then seven (siete) to get 'cuarenta y siete'. This exact formula works for every single number all the way up to 99!
Role-play
Comparing Ages and Shopping
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Conversación
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Myth-busting corner
MythYou write 'treinta y dos' as one big squished word like 'treintaydós'.
TruthOnly numbers from 16 to 29 are squished together into one word. From 31 onwards, they are always written as three separate words.
MythThe word 'uno' stays exactly the same when counting objects.
TruthBefore a masculine singular noun, 'uno' changes to 'un'. You say 'un libro' (one book) rather than 'uno libro'.
Exam answer that scores full marks
Explain the pattern used to build Spanish numbers from 31 to 99, with an example.
Para formar los números del 31 al 99 en español, usamos un patrón constante de tres palabras: [decena] + y + [unidad] (To form numbers from 31 to 99 in Spanish, we use a constant pattern of three words: [tens] + y + [ones]). Por ejemplo, el número cuarenta y siete (47) se forma combinando la decena 'cuarenta' (forty), la palabra 'y' (and), y la unidad 'siete' (seven). Este patrón es el mismo para todos los números en esta categoría, a diferencia de los números del 16 al 29 que se escriben como una sola palabra.
Why it scores
- Clearly explains the three-word structural pattern with labels in Spanish and English.
- Provides an accurate, correctly spelled example (cuarenta y siete) with a clear translation breakdown.
- Contrasts the pattern accurately with the compound single-word spelling used for 16-29.