Numbers

Cardinal numbers

 1 = uno 28 = vientiocho 2 = dos 29 = vientinueve 3 = tres 30 = treinta 4 = cuatro 31 = treinta y uno 5 = cinco 32 = treinta y dos 6 = seis 40 = cuarenta 7 = siete 50 = cincuenta 8 = ocho 60 = sesenta 9 = nueve 70 = setenta 10 = diez 80 = ochenta 11 = once 90 = noventa 12 = doce 100 = cien 13 = trece 101 = ciento uno 14 = catorce 102 = ciento dos 15 = quince 200 = doscientos 16 = dieciséis 300 = trescientos 17 = diecisiete 400 = cuatrocientos 18 = dieciocho 500 = quinientos 19 = diecinueve 600 = seiscientos 20 = viente 700 = setecientos 21 = veintiuno 800 = ochocientos 22 = veintidós 900 = novecientos 23 = veintitrés 1.000 = mil 24 = veinticuatro 1.001 = mil uno 25 = veinticinco 10.000 = diez mil 26 = veintiséis 100.000 = cien mil 27 = veintisiete 1.000.000 = un million

In numbers after 30 the conjunction y is used between the tens and the units, but not between the hundreds and the tens:

46 = cuarenta y seis

432 = cuatrocientos treinta y dos

millón requires the use of de:

•  a million people = un millón de personas
•  three million votes = tres millones de votos

Numbers over one million

•  1 000 000 000 = mil millones or un millardo (one billion)
•  1 000 000 000 000 = un billón, un millón de millones (one trillion)
•  1015 = mil billones (one quadrillion)
•  1018 = un trillón (one quintillion)

The examples above show Spanish usage as recommended by the RAE. However, billón and trillón are increasingly being used as the equivalents of the English billion and trillion respectively. This usage is not sanctioned by the RAE.

It should be noted that the Real Academia Española (RAE) recommends the International Standardization Office's ruling on the treatment of thousands. This states that spaces should be used to separate groups of three digits. This has been followed in the list above. However, in practice it will be found that spaces, points, and commas are used as separators.

In most Spanish-speaking countries a point is used for writing figures over one thousand:

•  1,000 (one thousand)= 1.000 (mil)
•  1,000,000 (one million)= 1.000.000 (un millón)

Some Latin American countries, however, use the comma as in English:

•  1,000 (one thousand)= 1,000 (mil)
•  1,000,000 (one million)= 1,000,000 (un millón)

Gender and agreement

Numbers in Spanish are masculine when used as nouns, and require an article:

•  there’s a zero missing = le falta un cero
•  the prize went to number 21344 = el premio correspondió al veintiún mil trescientos cuarenta y cuatro

When a number refers to a noun which does not appear in the sentence, the article will agree with that noun:

•  which is your office? – 603 = ¿cuál es tu oficina? – la 603

When used as adjectives, numbers are invariable, except uno and ciento, any number ending in uno and ciento, and quinientos:

•  40 pounds = cuarenta libras
•  300 euros = trescientos euros

Un/uno/una

uno becomes un before a masculine noun:

•  one o a peso = un peso
•  21 pesos = veintiún pesos

una is used before a feminine noun:

•  one o a person = una persona
•  a las veintiuna horas = at twenty-one hours

uno and una are used as pronouns:

•  I have only one left = sólo me queda uno
•  I asked him for one = le pedí una

Cien/ciento

The form cien is used:

▪ When the word is used alone:

•  How many are there? – 100 = ¿cuántos hay? – cien

▪ When modifying another larger number:

•  100,000 people = cien mil personas
•  100,000,000 dollars = cien millones de dólares

▪ Before a noun:

•  100 tickets = cien entradas
•  100 pupils = cien alumnos

ciento is used to express numbers from 101 to 199:

•  105 = ciento cinco
•  198 = ciento noventa y ocho

Ordinal numbers

 1st = primero 1º 2nd = segundo 2º 3rd = tercero 3º 4th = cuarto 4º 5th = quinto 5º 6th = sexto 6º 7th = séptimo 7º 8th = octavo 8º 9th = noveno 9º 10th = décimo 10º 11th = undécimo or decimoprimero 11º 12th = duodécimo or decimosegundo 12º 13th = decimotercero 13º 14th = decimocuarto 14º 15th = decimoquinto 15º 16th = decimosexto 16º 17th = decimoséptimo 17º 18th = decimoctavo 18º 19th = decimonoveno or decimonono 19º 20th = vigésimo 20º 21st = vigesimoprimero 21º 22nd = vigesimosegundo 22º 23rd = vigesimotercero 23º 30th = trigésimo 30º 40th = cuadragésimo 40º 50th = quincuagésimo 50º 60th = sexagésimo 60º 70th = septuagésimo 70º 80th = octogésimo 80º 90th = nonagésimo 90º 100th = centésimo 100º 1,000th = milésimo 1.000º 1,000,000th = millonésimo 1.000.000º

Ordinals above décimo (10th) are often replaced by the corresponding cardinal number, especially in less formal speech:

•  the 40th anniversary = el cuarenta or el cuadragésimo aniversario

Cardinal numbers are also used in titles where the number is above ten:

•  Carlos V = Carlos quinto
•  Isabel II = Isabel segunda
•  Alfonso XIII = Alfonso trece
•  Juan XXIII = Juan veintitrés

Gender and agreement

Spanish ordinal numbers agree with the noun they are qualifying, as do their abbreviated forms:

•  the 2nd volume = el segundo tomo or el 20 tomo
•  the 5th installment = la quinta entrega or la 5a entrega

primero and tercero become primer and tercer when they precede a masculine singular noun, even if there is an intervening adjective:

•  his third attempt = su tercer intento
•  the first great scholar of the subject = el primer gran estudioso del tema

The abbreviated forms of primer and tercer are 1er and 3er