Cardinal Numbers: 1-10

Here are the numbers 1-10:

1. uno
2. dos
3. tres
4. cuatro
5. cinco
6. seis
7. siete
8. ocho
9. nueve
10. diez

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The number "one" changes from "uno" to "un" before a masculine noun.

un libro
one book

un gato
one cat (male)

un hombre
one man

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The number "one" changes from "uno" to "una" before a feminine noun.

una pluma
one pen

una gata
one cat (female)

una chica
one girl

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When counting generically (one, two, three ...) use "uno" but when counting specifically (one cat, one dog), use "un" or "una."

un libro
one book

una pluma
one pen

uno, dos, tres

Cardinal Numbers: 11-30

Here are the numbers 11-20:

11. once
12. doce
13. trece
14. catorce
15. quince
16. dieciséis
17. diecisiete
18. dieciocho
19. diecinueve
20. veinte

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Here are the numbers 21-30:

21. veintiuno
22. veintidós
23. veintitrés
24. veinticuatro
25. veinticinco
26. veintiséis
27. veintisiete
28. veintiocho
29. veintinueve
30. treinta

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Notice how the numbers 16-19 and 21-29 are actually contractions. That is, sixteen is a contraction of the words "ten and six," twenty one is a contraction of the words "twenty and one," etc.

dieciséis
diez y séis

diecisiete
diez y siete

dieciocho
diez y ocho

diecinueve
diez y nueve

veintiuno
veinte y uno

veintidós
veinte y dos

veintitrés
veinte y tres

veinticuatro