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To compare things that are unequal, we use más que (more … than) and menos que (less … than):

Ese pescado es más grande que este pescado.
That fish is bigger than this fish.

Pedro es más alto que Berta.
Pedro is taller than Berta.

Berta y Carla son menos altas que Pedro.
Berta and Carla are not as tall as Pedro.

These words can also be used with nouns and verbs:

Enzo tiene más corbatas que su hermano pero menos que su padre.
Enzo has more neckties than his brother but fewer than his father.

Yo trabajo menos que Juan.
I work less than Juan.

To change a comparative (e.g. more) to a superlative (e.g. the most), we add the definite article:

José es el menos atlético de los tres hermanos.
José is the least athletic of the three brothers.

Cristina y Susana son las chicas más tímidas de la clase.
Cristina and Susana are the shyest girls in the class.

Note that we use the preposition de after a superlative, regardless of how that preposition would be translated in English.

To say more than or less than a specific number, we use más and menos with the preposition de:

Enzo tiene más de veinte camisas pero menos de diez corbatas.
Enzo has more than twenty shirts but fewer than ten neckties.

To talk about things that are equal, we use tancomo (as … as) with adjectives and the variable form tantocomo (as much/as many … as) with nouns and verbs:

Alexandra es tan graciosa como su padre.
Alexandra is as funny as her father.

Enzo tiene tantas camisas como su hermano.
Enzo has as many shirts as his brother.

Violeta trabaja tanto como Miguel.
Violeta works as much as Miguel