Round ordinal numbers are formed from the cardinal numbers by adding the definite adjective endings -ais (m.) and -ā (f.).
| Number | Masculine | Feminine |
|---|---|---|
| 20 | divdesmit/ais | divdesmit/ā |
| 30 | trīsdesmit/ais | trīsdesmit/ā |
| 40 | četrdesmit/ais | četrdesmit/ā |
| 50 | piecdesmit/ais | piecdesmit/ā |
| 60 | sešdesmit/ais | sešdesmit/ā |
| 70 | septiņdesmit/ais | septiņdesmit/ā |
| 80 | astoņdesmit/ais | astoņdesmit/ā |
| 90 | deviņdesmit/ais | deviņdesmit/ā |
| 100 | simt/ais | simt/ā |
In compound ordinals, only the last word takes the ordinal ending; the others keep the cardinal form, e.g.: divdesmit pirmais (21st), simt piektais (105th).