tveimur

In a sentence

• Ég á tvo bíla en keyri aðeins á tveimur.

  I own two cars but drive only two of them.

  Here, 'tveimur' is the dative plural form of the number 'two,' and it is used because the verb 'keyri á' governs the dative case.

• Við ætlum að skipta kökunni í tveimur jöfnum hlutum.

  We are going to divide the cake into two equal parts.

  In this example, 'tveimur' is again in the dative plural, used because of the preposition 'í' when indicating division or equal distribution.

• Hann gaf tveimur nemendum bók hver.

  He gave each of two students a book.

  In this case, 'tveimur' is used in the dative case, which is required by the verb 'gaf' when specifying to whom the object (book) is given.