Spanish Numbers One Through 100 (2026): How to Count

TL;DR

Spanish numbers one through 100 follow predictable patterns once you memorize 0 to 15 and the tens. Numbers 16 to 19 and 21 to 29 are written as single fused words, while 30 to 99 use the formula tens + y + unit (like treinta y cinco). Only four numbers in this range carry accent marks: dieciséis, veintidós, veintitrés, and veintiséis. The word uno shortens to un or una before nouns, and cien is used alone or before mil/millón, while ciento covers 101 to 199.

Quick Reference: Every Spanish Number from 1 to 100

Before anything else, here is the full list. The four numbers with accent marks are marked with a ★.

That is the complete set of Spanish numbers one through 100. Bookmark this page or save the table for reference. Now let’s break down the patterns that make all of this learnable.

If you want to drill these in short game sessions, Lingo Legend lets you practice Spanish vocabulary (including numbers) through RPG card battles and a farm sim, with spaced repetition built in. It’s free to download on iOS and Android.

The Build Rules That Make Counting in Spanish Easy

You do not need to memorize 100 separate words. Spanish numbers follow a clear system once you understand four groups.

Group 1: Memorize 0 to 15

These are unique words with no repeating pattern. Just learn them: cero, uno, dos, tres, cuatro, cinco, seis, siete, ocho, nueve, diez, once, doce, trece, catorce, quince. No shortcuts here.

Group 2: Fused words for 16 to 19

Starting at 16, you combine diez (“ten”) with the unit into a single word. The spelling changes slightly:

• 16 = dieciséis (diez + seis, with an accent)

• 17 = diecisiete

• 18 = dieciocho

• 19 = diecinueve

Notice that diez becomes dieci- and the two parts merge. In older texts you may see the separated form diez y ocho, but modern standard spelling per the RAE (Real Academia Española) uses the fused form. Practitioners on Reddit have noted that learners sometimes encounter legacy spellings like diez y ocho in old books and get confused, but the single-word version is the accepted standard today.

Group 3: Fused words for 21 to 29

Same logic, but with veinte (“twenty”) becoming veinti-:

• 21 = veintiuno

• 22 = veintidós (accent!)

• 23 = veintitrés (accent!)

• 24 = veinticuatro

• 25 = veinticinco

• 26 = veintiséis (accent!)

• 27 = veintisiete

• 28 = veintiocho

• 29 = veintinueve

All one word. A common mistake is writing veinte y dos as two words. Don’t do that. The fused spelling veintidós is the standard.

Group 4: Tens + y + unit for 31 to 99

From 31 onward, the pattern becomes three separate words: the tens word, y (“and”), then the unit.

• 31 = treinta y uno

• 45 = cuarenta y cinco

• 67 = sesenta y siete

• 99 = noventa y nueve

The tens words you need to know:

A memory trick that learners commonly share in forums: sesenta starts like seis (6 → 60), and setenta starts like siete (7 → 70). This resolves the most common mix-up between those two.

One critical rule from the RAE: the word y appears only between tens and units, never between hundreds and tens. So it’s ciento veinte (120), not ciento y veinte. This rule applies throughout the entire number system.

Fun fact: The RAE and Fundéu do admit fused single-word forms like treintaiuno and cuarentaidós as valid alternatives, but these remain minority usage in practice. Stick with the three-word versions for now.

Uno Changes Shape Before Nouns (And So Do Its Compounds)

This catches nearly every beginner. The number uno by itself stays uno. But the moment it appears directly before a noun, it shortens:

• Before a masculine noun: un (veintiún libros, “twenty-one books”)

• Before a feminine noun: una (veintiuna sillas, “twenty-one chairs”)

This applies to every compound ending in -uno: treinta y un actores, treinta y una personas, cuarenta y un días, cuarenta y una noches.

The percentage exception

When you say percentages, the full form uno (or veintiuno, treinta y uno) is always used, because por ciento is not a noun that triggers shortening. The RAE is explicit: say veintiuno por ciento, never veintiún por ciento.

Correct:treinta y uno por cientoIncorrect:treinta y un por ciento

What you’ll hear vs. what’s correct

Learners on Reddit report that in parts of Mexico and other regions, speakers sometimes default to un even with feminine plural nouns in casual speech (for example, treinta y un preguntas instead of treinta y una preguntas). This is colloquial usage. In standard written Spanish, gender agreement is expected, and Fundéu recommends matching the gender of the noun.

Once you’ve mastered how numbers pair with nouns, you’re ready to learn Spanish greetings and introductions, where numbers come up naturally in phrases like Tengo veintiún años (“I’m twenty-one years old”).

Cien vs. Ciento (And Why Un Mil Is Wrong)

This is a two-rule system:

Rule 1: Use cien when it stands alone or comes before mil or millón.

• Tengo cien euros. (“I have 100 euros.”)

• Cien mil personas. (“100,000 people.”)

• Cien millones. (“100 million.”)

Rule 2: Use ciento for 101 through 199.

• 101 = ciento uno

• 135 = ciento treinta y cinco

• 199 = ciento noventa y nueve

The RAE’s Diccionario panhispánico de dudas confirms this distinction clearly.

Mil, not un mil

English says “one thousand,” but Spanish just says mil. The form un mil is discouraged by the RAE. Say mil quinientos (1,500), not un mil quinientos.

The plural miles exists only in the sense of “thousands of”: Miles de personas asistieron (“Thousands of people attended”).

Hundreds above 100 agree in gender

From 200 onward, the hundreds words change for feminine nouns: doscientos hombres but doscientas mujeres, trescientos libros but trescientas páginas. This is worth knowing even though it goes beyond the Spanish numbers 1 through 100 range.

The Four Accent Marks You Must Memorize

Out of every number from 1 to 100, exactly four carry a written accent (tilde). Here they are:

1. dieciséis (16)

2. veintidós (22)

3. veintitrés (23)

4. veintiséis (26)

Why these four and no others? In Spanish orthography, words stressed on the last syllable (agudas) that end in -s require a written accent mark. Each of these ends in -s and has its natural stress on the final syllable: dieci-SÉIS, veinti-DÓS, veinti-TRÉS, veinti-SÉIS. This pattern is consistent with RAE accent rules.

Quick practice: Write three sentences using at least two of these numbers. For example:

• Tengo dieciséis años. (“I’m 16 years old.”)

• Hay veintidós estudiantes en la clase. (“There are 22 students in the class.”)

• Pagué veintitrés euros. (“I paid 23 euros.”)

If you skip the accent, a native reader will notice. Get it right from the start.

Pronunciation Basics That Unlock Comprehension

The biggest pronunciation split across the Spanish-speaking world shows up in numbers more than you might expect. It comes down to one sound.

Spain vs. Latin America: the c/z rule

In Spain, the letters c (before e or i) and z are pronounced like the English “th” in “think.” In Latin America, those same letters are pronounced like a plain “s.”

This means:

Neither pronunciation is more correct than the other. Both are standard in their respective regions. If you’re studying for travel to Mexico City, use the “s” sound. If you’re headed to Madrid, use the “th” sound. For most learning purposes, pick one and be consistent.

Everything else about Spanish number pronunciation follows regular Spanish reading rules. The vowels are always the same (a, e, i, o, u have one sound each), and consonants are predictable.

How to Write Numbers in Real Life

Knowing the Spanish numbers one through 100 as words is half the job. You also need to know how to write them as digits in prices, decimals, percentages, and phone numbers, because conventions differ from English.

Decimal separators

In English, a period marks the decimal: 3.14. In Spanish, both the comma and the period are valid as decimal separators depending on the country:

• 3,14 (common in Spain, Argentina, and much of Latin America)

• 3.14 (common in Mexico, some Central American countries)

The RAE accepts both forms and notes that international standards now permit either. When in doubt, match the local convention of your audience.

Thousands grouping

Here is where it gets surprising. The RAE’s current recommendation is to group thousands with a thin space, not a period or comma:

• Recommended: 30 000

• Legacy (still common): 30.000 or 30,000

This avoids the ambiguity where one country’s thousand separator looks like another country’s decimal point. The thin-space standard comes from RAE’s 2010 orthography update, though newspapers and everyday use still vary widely.

Percentages

Percentages use por ciento. A sentence example: El treinta y uno por ciento de los estudiantes aprobó. (“Thirty-one percent of the students passed.”)

Remember: it’s treinta y uno por ciento, with the full uno, not the shortened un.

Phone numbers

Spanish speakers typically read phone numbers digit by digit, or in pairs. Knowing the individual digits (0 to 9) well is essential for this. There is no universal convention for grouping, so if someone says seis, cinco, cuatro, tres, dos, uno, they mean 654321.

This is a natural place to practice numbers in context, and Spanish food vocabulary creates another real-world scenario where you’ll use numbers constantly when reading menus and asking about prices.

The billón trap

A quick warning for English speakers: the Spanish word billón means one trillion (10^12), not one billion (10^9). English’s “billion” translates to mil millones in Spanish. The RAE’s dictionary entry for billón confirms this. Getting it wrong in a business context could mean a factor-of-1,000 error.

Common Mistakes: A Fast Checklist

Here are the errors that trip up learners most often when studying Spanish numbers 1 to 100:

Mistake 1: Writing the twenties as two words. Wrong: veinte y dos. Right: veintidós. The numbers 21 to 29 are always one word.

Mistake 2: Using the shortened form before por ciento. Wrong: veintiún por ciento. Right: veintiuno por ciento. Percentages always take the full uno/veintiuno/treinta y uno.

Mistake 3: Saying un mil instead of mil. Wrong: un mil doscientos. Right: mil doscientos. Spanish drops the un before mil.

Mistake 4: Inserting y between hundreds and tens. Wrong: ciento y veinte. Right: ciento veinte. The conjunction y goes only between tens and units: ciento veintiuno (not ciento y veintiuno).

Mistake 5: Forgetting gender agreement with uno compounds. Wrong: veintiún personas. Right: veintiuna personas. Match the gender of the noun.

Mistake 6: Dropping accents on the four numbers that need them. Wrong: dieciseis. Right: dieciséis. Same for veintidós, veintitrés, and veintiséis.

Real-World Mini Dialogues

Seeing Spanish numbers one through 100 in context helps them stick. Here are two short exchanges using only numbers under 100.

Ordering coffee

Giving your age and a price

Practice You Can Do Today

A seven-minute routine is enough to start internalizing the Spanish numbers 1 through 100:

1. Read the table once from 0 to 100, saying each number out loud.

2. Say ten random prices under 100. Pick numbers at random and say them as prices: cuarenta y siete con noventa y nueve (47,99). Focus on using y correctly and hitting the four accented numbers when they come up.

3. Build eight numbers from English cues. Someone says “thirty-eight,” you say treinta y ocho. “Ninety-one” becomes noventa y uno. Try to do this without looking at the table.

4. Write three sentences that include numbers with tildes. Double-check your accents against the list above.

5. Lock it in with spaced repetition. Open Lingo Legend and use the built-in Spanish beginner categories or import a custom “Numbers” deck via CSV to get spaced, mixed-mode reviews inside the RPG. The game’s spaced repetition scheduling ensures numbers resurface at the right intervals for long-term memory, and monthly challenges keep you coming back.

You can also explore Lingo Legend’s farm-sim mode, Yorthwood, which gives you a cozy alternative to battle mode while still running through vocabulary drills.

10-Item Self-Check Quiz

Test yourself. Answers are below.

1. Write “sixteen” in Spanish (with correct accent).

2. Is it veinte y tres or veintitrés?

3. Translate: “twenty-one books” (books = libros, masculine).

4. Fill in the blank: El ______ por ciento. (31%)

5. Cien or ciento? _____ cuarenta y dos.

6. How do you say 1,000 in Spanish? (Un mil or mil?)

7. Which number is this? Setenta y ocho.

8. Write “twenty-six” in Spanish (with correct accent).

9. True or false: y goes between hundreds and tens.

10. What does billón mean in Spanish?

Answers

1. Dieciséis

2. Veintitrés (one word, with accent)

3. Veintiún libros (shortened before masculine noun)

4. Treinta y uno por ciento (full uno for percentages)

5. Ciento cuarenta y dos (use ciento for 101 to 199)

6. Mil (un mil is discouraged)

7. 78

8. Veintiséis

9. False. Y goes only between tens and units.

10. One trillion (10^12), not one billion.

How did you do? If you got 8 or more right, the patterns have clicked. For ongoing review, Lingo Legend’s spaced repetition and quickfire drills make it easy to keep numbers sharp alongside the rest of your Spanish vocabulary. The app is free to download, with unlimited daily play available through a membership.

FAQ

What are the Spanish numbers 1 through 100?

The numbers start with uno, dos, tres, cuatro, cinco and continue through unique forms up to quince (15). From 16 to 29, they become fused single words (dieciséis, veintiuno). From 30 onward, they follow the pattern tens + y + unit (treinta y uno, cuarenta y dos), all the way to noventa y nueve (99) and cien (100). The full list is in the table above.

When do you use cien vs. ciento?

Use cien when saying 100 by itself or before mil and millón (cien, cien mil, cien millones). Use ciento for any number from 101 to 199 (ciento uno, ciento treinta y cinco). The RAE’s Diccionario panhispánico de dudas confirms this rule.

Why does 21 change to veintiún or veintiuna?

The number uno shortens before nouns: un before masculine nouns and una before feminine nouns. This extends to all compounds ending in -uno. So “twenty-one books” is veintiún libros and “twenty-one chairs” is veintiuna sillas. However, in percentages you always keep the full form: veintiuno por ciento.

Which Spanish numbers have accent marks?

Only four numbers between 1 and 100 carry written accents: dieciséis (16), veintidós (22), veintitrés (23), and veintiséis (26). They are stressed on the last syllable and end in -s, which requires a tilde under standard Spanish accent rules.

How do you write decimals and thousands in Spanish?

For decimals, both comma and period are accepted depending on the region (3,14 or 3.14). For thousands, the RAE recommends a thin space (30 000) to avoid confusion, though legacy formats with periods or commas persist in everyday media.

Is it un mil or mil for 1,000?

Just mil. The RAE discourages un mil. Say mil doscientos for 1,200, not un mil doscientos. The plural miles is used only to mean “thousands of” (miles de personas).

What’s the difference between Spanish billón and English billion?

Spanish billón equals 10^12 (one trillion in English). English “billion” (10^9) translates to mil millones in Spanish. The RAE defines billón using the long scale, which is standard across all Spanish-speaking countries.

What’s the fastest way to memorize Spanish numbers 1 to 100?

Learn the 16 unique forms (0 to 15), then the tens words (20, 30, 40… 90), and finally practice combining them with the y pattern. That gives you the ability to build any number on the fly. Spaced repetition accelerates the process. You can practice these patterns for free in Lingo Legend, which schedules optimal review intervals and uses varied question types to keep recall active.

For more Spanish learning resources, visit the Lingo Legend blog. Want to request a printable numbers deck or share feedback? Reach out here.