The number for one in Spanish is uno. It loses its o and becomes un when used before a masculine noun.

When used before a feminine noun it changes to una.

For example:

• un niño - one boy
• una niña - one girl

You should use uno when counting generically, as in:

• uno, dos, tres, cuatro - one, two, three, four

You should use un or una when counting specifically, as in:

• un plátano, una manzana - one banana, one apple

So, having explained the various forms of one in Spanish and when to use them, let´s now get started on the list of 1 100 Numbers In Spanish.

 cero   - 0     cinco - 5
 uno    - 1     seis  - 6
 dos    - 2     siete - 7
 tres   - 3     ocho  - 8
 cuatro - 4     nueve - 9
 diez - 10 

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

The Spanish numbers 16 through to 19 are actually contractions.

For example, the Spanish for 16 - dieciséis - literally means ten and six, but is joined together, as shown below:

dieciséis = diez y seis
diecisiete = diez y siete
dieciocho = diez y ocho
diecinueve = diez y nueve

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

You will notice that, like the cardinal numbers 16 to 19, the Spanish numbers 21 to 29 are also contractions, but this time of the Spanish for twenty and one, etc.

veintiuno = veinte y uno
veintidós = veinte y dos

Let us now look at the Spanish numbers, going up in tens, from 40 to 90.

 cuarenta  - 40    setenta - 70
 cincuenta - 50    ochenta - 80
 sesenta   - 60    noventa - 90

With these, you just have to add ... y uno, ... y dos, ... y tres onto them and they are not usually done as contractions. For example:

cuarenta y uno - 41
cuarenta y dos - 42
cuarenta y tres - 43
cuarenta y cuatro - 44
cuarenta y cinco - 45

This pattern coninues all the way up to 99, which brings us up to our final number for this page - one hundred!

The Spanish number for one hundred is cien and sometimes ciento.

When there is exactly one hundred of something and the number is used with the noun - be it masculine or feminine - use the shortened form cien. For example:

cien euros - 100 euros
cien libras - 100 pounds