Los números: 21 - 30

21 = veintiuno (veintiún, veintiuna)*

22 = veintidós*

23 = veintitrés*

24 = veinticuatro

25 = veinticinco

26 = veintiséis*

27 = veintisiete

28 = veintinueve

30 = treinta

*Note 1: the numbers 21 (veintiún), 22, 23 and 26 have an accent! That is because they end in -S or -N.

Note 2: as with number one (uno), number 21 (veintiuno) mirrors the gender of the word they describe.

Ejemplo:

Hay veintiún alumnos en mi clase.

There are 21 students in my class.

Hay veintiuna sillas en la clase.

There are 21 chairs in the class.

Note 3: the numbers from 21 to 29 are just contractions of 20 and the unit ("veinte y uno" becomes "veintiuno", "veinte y dos" becomes "veintidós" and so on).