In Latvian there are two types of numerals: cardinal numerals and ordinal numerals. Cardinal numerals are declinable or indeclinable. Declinable cardinal numerals are declined as indefinite adjectives and ordinal numerals are declined as definite adjectives. Exceptions are numerals trīs (three), pusotra (one and a half), pustreša (one and a third), pusceturta (one and a fourth). If numeral is compound then each constituent of numeral is declined separately.
Indeclinable are numerals which has no ending:
desmit;
numerals 11-19: vienpadsmit, divpadsmit, trīspadsmit, četrpadsmit, piecpadsmit, sešpadsmit, septiņpadsmit, astoņpadsmit, deviņpadsmit;
compounds with desmit: divdesmit, trīsdesmit, četrdesmit, piecdesmit, sešdesmit, septiņdesmit, astoņdesmit, deviņdesmit;
compounds with simt: simt, divsimt, trīssiit, četrsimt, piecsimt, sešsimt, septiņsimt, astoņsimt, deviņsimt;
compounds with tūkstoš: tūkstoš, divtūkstoš, trīstūkstoš, četrtūkstoš, piectūkstoš, seštūkstoš, septiņtūkstoš, astoņtūkstoš, deviņtūkstoš, etc.
Declension of cardinal numerals
| Masc., plur. | Fem., plur. | |
| Nominative | div-i | div-as |
| Genitive | div-u | div-u |
| Dative | div-iem | div-ām |
| Accusative | div-us | div-ās |
| Locative | div-os | div-ās |
Declension of ordinal numerals
| Masc., sing. | Fem., sing. | Masc., plur. | Fem., plur. | |
| Nominative | otr-ais | otr-ā | otr-ie | otr-ās |
| Genitive | otr-ā | otr-ās | otr-o | otr-o |
| Dative | otr-ajam | otr-ajai | otr-ajiem | otr-ajām |
| Accusative | otr-o | otr-o | otr-ajos | otr-ajās |
| Locative | otr-ajā | otr-ajā | otr-ajos | otr-ajās |
Declension of cardinal numeral trīs
| Masc., plur. | Fem., plur. | |
| Nominative | trī-s | trī-s |
| Genitive | trij-u | trij-u |
| Dative | tri-m, trij-iem | tri-m, trij-ām |
| Accusative | trī-s | trī-s |
| Locative | trij-os, trī-s | trij-ās, trī-s |
Declension of cardinal numeral pusotra
| Masc., sing. | Fem., sing. | Masc., plur. | Fem., plur. | |
| Nominative | - | - | - | - |
| Genitive | pusotr-a | pusotr-as | pusotr-u | pusotr-u |
| Dative | pusotr-am | pusotr-ai | pusotr-iem | pusotr-ām |
| Accusative | pusotr-u | pusotr-u | pusotr-us | pusotr-as |
| Locative | pusotr-ā | pusotr-ā | pusotr-os | pusotr-ās |