Quantitative adjectives express quantity, order, proportion or distribution and specify the noun without describing qualities. Some agree in gender and number, while others are invariable or only vary in certain contexts. Their position and form depend on the type of quantification and the noun they accompany, as occurs with [Cardinal Numerals] and [Indefinite Adjectives].

Cardinal numerals indicate exact quantity and normally precede the noun. They are used with countable nouns to count entities, and with some form changes they adapt to the agreement required by grammar.

IdeaIdea	EjemploExample
uno cambia a un antes de sustantivo masculino singularone changes to 'un' before a masculine singular noun	Un libro está sobre la mesaA book is on the table
uno cambia a una antes de sustantivo femenino singularone changes to 'una' before a feminine singular noun	Una idea clara guía el textoA clear idea guides the text
veintiuno adopta la forma veintiún antes de sustantivo masculino singulartwenty-one adopts the form veintiún before a masculine singular noun	Veintiún alumnos llegaron tempranoTwenty-one students arrived early
ciento se reduce a cien ante ciertos sustantivos o cuando no precede a otro numeralhundred (ciento) reduces to cien before certain nouns or when it does not precede another numeral	Cien páginas bastan para empezarOne hundred pages are enough to start

Ordinals express position or sequence and are usually placed before the noun when they form part of the noun phrase. Primero and tercero are shortened to primer and tercer before a masculine singular noun, while the other forms maintain their ordinal value with regular agreement.

IdeaIdea	EjemploExample
primero puede acortarse a primer antes de sustantivo masculino singularfirst can be shortened to primer before a masculine singular noun	El primer día fue intensoThe first day was intense
tercero puede acortarse a tercer antes de sustantivo masculino singularthird can be shortened to tercer before a masculine singular noun	Leí el tercer capítuloI read the third chapter
los ordinales concuerdan en género y número cuando el contexto lo exigeordinals agree in gender and number when required by context	La segunda parte fue más breveThe second part was shorter
los ordinales indican orden y no cantidad exactaordinals indicate order and not exact quantity	Llegó en cuarto lugarHe arrived in fourth place

Partitives express fraction or portion and multiplicatives express multiplication of quantity or intensity. Medio can function as a quantitative adjective before a noun and also as a measure value, while mitad is usually introduced with de to indicate a fraction of a whole.

IdeaIdea	EjemploExample
mitad expresa una fracción de un conjuntomitad expresses a fraction of a set	La mitad de la torta quedó en la mesaHalf of the cake stayed on the table
medio puede cuantificar una medida o una porciónmedio can quantify a measure or a portion	Pidió medio litro de lecheHe asked for half a liter of milk
doble expresa el doble de cantidad o de intensidaddoble expresses double the quantity or intensity	Necesitamos doble ración de arrozWe need a double portion of rice
triple expresa tres veces una cantidad o una accióntriple expresses three times a quantity or an action	Ganó con triple salto en la pruebaHe won with a triple jump in the event

Distributives distribute a quantity among members of a set and indicate individual correspondence. Cada is the most frequent distributive and precedes the noun, while sendos and sendas express distribution separately among two or more referents and typically agree with the noun they accompany.

IdeaIdea	EjemploExample
cada distribuye una unidad por miembrocada distributes one unit per member	Cada alumno recibió una hojaEach student received a sheet
sendos indica uno para cada persona o cosasendos indicates one for each person or thing	Los invitados llevaron sendas mochilasThe guests carried matching backpacks
sendas concuerda en femenino plural con el sustantivosendas agrees in feminine plural with the noun	Las hermanas llevaron sendas valijasThe sisters carried matching suitcases
cada puede usarse con sustantivos singulares para reparto individualcada can be used with singular nouns for individual distribution	Cada mesa tenía una velaEach table had a candle

Mucho and poco express approximate quantity and agree with the gender and number of the noun. In Spanish, poco can also function as an adverb and then stops agreeing, while the quantitative form adapts to the noun it accompanies.

IdeaIdea	EjemploExample
mucho concuerda con sustantivos masculinos singularesmucho agrees with masculine singular nouns	Hay mucho trabajo hoyThere is a lot of work today
mucha concuerda con sustantivos femeninos singularesmucha agrees with feminine singular nouns	Tomó mucha aguaHe drank a lot of water
muchos concuerda con sustantivos masculinos pluralesmuchos agrees with masculine plural nouns	Llegaron muchos librosMany books arrived
muchas concuerda con sustantivos femeninos pluralesmuchas agrees with feminine plural nouns	Compramos muchas floresWe bought many flowers

Bastante, suficiente y demasiado express non-precise quantity and can accompany a noun or an adjective. Bastante and suficiente indicate an adequate level or near the necessary, while demasiado marks excess and tends to reinforce a negative assessment or an exceeded limit.

IdeaIdea	EjemploExample
bastante indica cantidad o grado suficientebastante indicates quantity or sufficient degree	Hay bastante comida para todosThere is plenty of food for everyone
suficiente señala medida adecuadasuficiente points to an adequate measure	Tiene suficiente tiempo para terminarHe has enough time to finish
demasiado indica excesodemasiado indicates excess	Hay demasiado ruido en la calleThere is too much noise on the street
estos cuantificadores pueden modificar sustantivos o adjetivosthese quantifiers can modify nouns or adjectives	Es bastante claro lo que dijoIt is quite clear what was said

Most quantifiers precede the noun, although emphasis or sentence structure can alter placement. Agreement is essential when the quantifier varies in gender or number, but many numerals remain invariable in their basic form except for special forms that require adaptation, such as uno, una, veintiún and cien.

IdeaIdea	EjemploExample
la mayoría de los cuantificadores precede al sustantivoMost quantifiers precede the noun	Muchos estudiantes asistieron a claseMany students attended class
la posición puede variar por énfasis o estiloplacement can vary for emphasis or style	Estudiantes muchos llegaron tardeMany students arrived late
algunos cuantificadores concuerdan en género y númerosome quantifiers agree in gender and number	Pocas oportunidades aparecieron hoyFew opportunities appeared today
muchos numerales permanecen invariables en su forma básicamany numerals remain invariable in their basic form	Tres barcos cruzaron el puertoThree ships crossed the harbor

Quantitative adjectives organize nominal information by expressing number, order, part, repetition, distribution or degree. Mastery requires recognizing when they agree, when they remain fixed and what position they occupy relative to the noun, especially when alternating between countable and uncountable nouns. This precision strengthens the relationship with adjectival agreement and with other adjective groups such as descriptive, demonstrative, possessive and relative.