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All Ordinal Numbers except Annar are declined as weak adjectives
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Singular M F N N einn ein eitt A einn eina eitt D einum einni einu G eins einnar eins Plural M F N N einir einar ein A eina einar ein D einum einum einum G einna einna einna
Note: Einn may also be declined like a weak adjective: hinn eini, hin eina, hið eina, etc.
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M F N N tveir tvær tvö A tvo tvær tvö D tveim/ur tveim/ur tveim/ur G tveggja tveggja tveggja
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M F N N þrír þrjár þrjú A þrjá þrjár þrjú D þrem/ur þrem/ur þrem/ur G þriggja þriggja þriggja
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M F N N fjórir fjórar fjögur A fjóra fjórar fjögur D fjórum fjórum fjórum G fjögra fjögra fjögra
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When used as adjectives, these numbers are not declined except that the plural of hundrað is hundruð;
When used as nouns:
Hundrað is declined neuter;
Þúsund may be declined feminine like tíð or neuter like skip;
Milljón is always feminine.
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All Ordinal Numbers except Annar are declined as weak adjectives.
Singular M F N N annar önnur annað A annan aðra annað D öðrum annarri öðru G annars annarrar annars Plural M F N N aðrir aðrar önnur A aðra aðrar önnur D öðrum öðrum öðrum G annarra annarra annarra
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Nouns denoting fractions are formed, in general, by replacing the -i ending of the ordinal number with -ungur. Half is the exception.
So, þriðji gives þriðjungur.
helmingur (-s, -ar) - a half;
þriðjungur - a third;
fjórðungur - a quarter;
fimmtungur - a fifth, etc.
Adjectives are formed from the numerals by adding -faldur (-fold).
E.g. einfaldur - single; tvöfaldur - double, etc.
Some examples of quantities involving fractions:
hálfur - half;
einn þriðji - one third;
einn tíundi - one tenth;
hálfur þriðji eða tveir og hálfur - two and a half;
tveir sjöundu - two sevenths;
þrír fjórðu - three quarters;
sjö heilir og einn fjórði - seven and a quarter;
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Group numerals refer to things associated in twos, threes, etc. Examples of such words include:
einir - a pair;
tvennir - two pairs;
þrennir - three pairs;
fernir - four pairs.
These words are declined like adjectives, e.g.:
einir sokkar - a pair of socks;
tvennir skór - two pairs of shoes.
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These are akin to the English couple, dozen, score, etc., signifying certain quantities. Most are feminine in gender.
eining or eind - one of something;
tvenning or tvend - two of something;
þrenning or þrennd - three of something;
fimmt - five of something;
tíund or tugur - ten of something, e.g. tax at the rate of 10% (the historic tax rate);
tylft - twelve of something.
To multiply, the word sinn is used: einu sinni, tveim sinnum, and so on. Note the terms tvisvar (twice) and þrisvar (thrice).
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The numerical adjectives are used to describe measures such as age, height, length, depth, etc. They are:
tvítugur, þrítugur, fertugur, fimmtugur, sextugur, sjötugur, áttræður, níræður and tíræður
E.g. tvítugur, þrítugur, fertugur, tíræður - 20, 30, 40, 100 years old, metres deep, kilometers long, etc.
Examples:
tvítugur maður - a 20-year-old man (20 ára gamall maður);
þrítugur hamar - a 30-fathom high precipice (30 faðma hár hamar);
sextugt dýpi - a depth of 60 fathoms (60 faðma dýpi);
tvítugur hvalur - a 20-aln long whale (20 álna langur hvalur).
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