Spanish Numbers 1 to 100
Spanish numbers follow a beautifully logical pattern once you know the building blocks. From 1 to 15 you need to memorize individual words, but after that the system becomes predictable and consistent. This guide covers every number from 1 to 100 plus the ordinal numbers you will need in everyday conversation.
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Numbers 1–15: The Core Words
These fifteen numbers are unique words that must be memorized individually. They form the foundation for every larger number in Spanish.
Notice how 11-15 all end in -ce or -ce sounds: once, doce, trece, catorce, quince. This pattern makes them easier to remember as a group.
Numbers 16–20: The Merged Compounds
Starting at 16, Spanish numbers follow a "ten-and-digit" pattern. The numbers 16-19 are contractions of diez y seis, diez y siete, etc., written as single words.
Numbers 21–29: The Veinti- Pattern
The twenties also merge into single words, using the prefix veinti- plus the ones digit. This is the last set that combines into one word.
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Numbers 30–100: The "Y" Pattern
From 30 onward, compound numbers use two separate words joined by y (and): treinta y uno, cuarenta y dos, etc. The tens words follow a satisfying pattern — most end in -enta.
Cien is used when you mean exactly 100. When followed by another number (101, 150, etc.), it becomes ciento: ciento uno (101), ciento cincuenta (150).
Ordinal Numbers: First Through Tenth
Ordinal numbers indicate position or order. In Spanish, they agree in gender with the noun they modify. Beyond décimo (10th), Spanish speakers typically use cardinal numbers instead.
Primero and tercero drop the final -o before a masculine singular noun: el primer piso (the first floor), el tercer capítulo (the third chapter). The feminine forms stay unchanged: la primera vez (the first time).
Frequently Asked Questions
How do you count from 1 to 10 in Spanish?
The numbers 1-10 in Spanish are: uno, dos, tres, cuatro, cinco, seis, siete, ocho, nueve, diez. These are the foundation for all other Spanish numbers, so memorize them first before moving on to larger numbers.
Why do Spanish numbers 16-19 merge into one word?
In modern Spanish, the numbers 16-19 are written as single words (dieciséis, diecisiete, dieciocho, diecinueve) because they are contractions of "diez y seis," "diez y siete," etc. The spoken forms merged over time, and the spelling followed. Numbers 21-29 do the same thing (veintiuno, veintidós, etc.).
What is the difference between "uno" and "un" in Spanish?
Uno is used when counting by itself ("one, two, three..."). Un is used before masculine nouns as an article or adjective: un libro (one/a book). Before feminine nouns, it becomes una: una mesa (one/a table).
How do ordinal numbers work in Spanish?
Ordinal numbers in Spanish agree in gender and number with the noun they describe. For example, primero/primera (first), segundo/segunda (second). Before a masculine singular noun, primero and tercero shorten to primer and tercer: el primer día (the first day).
Do you need to learn ordinal numbers past 10th in Spanish?
In everyday speech, Spanish speakers rarely use ordinal numbers beyond décimo (10th). For higher positions, cardinal numbers are used instead: el piso doce (the 12th floor), el siglo veintiuno (the 21st century). This makes things much simpler for learners.