ABSTRACT
Hay treinta y un niños en la clase. (There are thirty-one children in the class.)
‘One’ takes the feminine form if accompanying or referring to a feminine noun.
una cerveza y una bolsa de patatas fritas (a/one beer and a/one packet of crisps) ¿Cuantas cervezas, una o dos? Una. (How many beers, one or two? One.)
Other numbers ending in ‘one’ also take the masculine or the feminine form.
