Ordinal numbers (порядко́ві числі́вники) answer "which one?" — first, second, third — and the single most useful fact about them is that they are not really numbers at all: they are adjectives. They agree with their noun in gender, number and case, and they decline exactly like ordinary adjectives. That one insight makes the whole topic easy, because you already know how Ukrainian adjectives behave. The only real complications are one soft-stem irregular (тре́тій) and the compound rule, where — unlike the cardinals — only the last word becomes ordinal.
The core ordinals: 1st–10th
| Ordinal (masc.) | Meaning | From cardinal |
|---|---|---|
| пе́рший | 1st | (suppletive — unrelated to оди́н) |
| дру́гий | 2nd | (suppletive — unrelated to два) |
| тре́тій | 3rd | три — soft stem! |
| четве́ртий | 4th | чоти́ри |
| п’я́тий | 5th | п’ять |
| шо́стий | 6th | шість |
| сьо́мий | 7th | сім |
| во́сьмий | 8th | ві́сім |
| дев’я́тий | 9th | де́в’ять |
| деся́тий | 10th | де́сять |
Notice that пе́рший and дру́гий are suppletive — they bear no resemblance to оди́н and два, just as English "first/second" don't look like "one/two." From 4th on, the ordinal is the cardinal's stem plus an adjective ending: четве́ртий, п’я́тий, шо́стий. Watch the spelling shifts: сім → сьо́мий and ві́сім → во́сьмий soften and reshape the stem, and дев’я́тий keeps the apostrophe from де́в’ять.
Це вже тре́тій раз, коли́ він спізню́ється, — більше я не чека́тиму.
This is already the third time he's been late — I won't wait any longer.
На сьо́мий день по́дорожі ми наре́шті поба́чили мо́ре.
On the seventh day of the trip we finally saw the sea.
Ordinals are adjectives: they agree fully
Because пе́рший is an adjective, it has the full set of gender and number endings — пе́рший / пе́рша / пе́рше / пе́рші — and it agrees with whatever it modifies:
| Gender/number | Form | Example |
|---|---|---|
| masc. | пе́рший | пе́рший уро́к (the first lesson) |
| fem. | пе́рша | пе́рша кни́га (the first book) |
| neut. | пе́рше | пе́рше мі́сце (first place) |
| pl. | пе́рші | пе́рші кро́ки (the first steps) |
На́ша кома́нда посі́ла пе́рше мі́сце — ніхто́ цьо́го не очі́кував.
Our team took first place — no one expected it.
Пе́рше вра́ження не повто́риш, тож готу́йся до співбесі́ди рете́льно.
You can't redo a first impression, so prepare for the interview thoroughly.
And they decline — including for the floor and the time
Being adjectives, ordinals take every case ending too. The two everyday places you meet a declined ordinal are floors of a building and telling the time:
Ми живемо́ на тре́тьому по́версі, ліфт, на жаль, не працю́є.
We live on the third floor; the lift, unfortunately, isn't working.
Зустрі́немося о пе́ршій годи́ні бі́ля фонта́на.
Let's meet at one o'clock by the fountain.
In о пе́ршій годи́ні "at one o'clock," пе́ршій is the locative feminine — the time in Ukrainian is literally "at the first hour," a fully declined ordinal. The whole system of telling time runs on declined ordinals; see Telling the Time.
тре́тій: the one soft-stem ordinal
Every ordinal except тре́тій is a hard-stem adjective (declining like нови́й). Тре́тій (3rd) is the lone soft-stem adjective among them — it declines like си́ній, with soft endings throughout:
| Case | Masc. | Fem. | Neut. |
|---|---|---|---|
| Nom. | тре́тій | тре́тя | тре́тє |
| Gen. | тре́тього | тре́тьої | тре́тього |
| Dat. | тре́тьому | тре́тій | тре́тьому |
| Instr. | тре́тім | тре́тьою | тре́тім |
| Loc. | (на) тре́тьому | тре́тій | тре́тьому |
So it is тре́тього тра́вня "on the third of May," на тре́тьому по́версі "on the third floor" — soft ь throughout. Compare hard-stem четве́ртого тра́вня, на четве́ртому по́версі. This contrast (hard нови́й vs soft си́ній) is the soft-stem adjective declension you already know — тре́тій simply follows it.
Tens, hundreds, and the high ordinals
The pattern continues predictably. The tens take -дцятий / -деся́тий, the hundreds -со́тий, and there are special words for round thousands:
| Ordinal | Meaning |
|---|---|
| одина́дцятий | 11th |
| двадця́тий | 20th |
| тридця́тий | 30th |
| сороко́вий | 40th |
| п’ятдеся́тий | 50th |
| дев’яно́стий | 90th |
| со́тий | 100th |
| двохсо́тий | 200th |
| ти́сячний | 1000th |
Two to note: сороко́вий (40th) is built on со́рок but reshaped, and ти́сячний (1000th) comes from ти́сяча. All of these are still ordinary hard-stem adjectives that agree and decline.
Це со́та річни́ця заснува́ння університе́ту — готу́ється вели́ке свя́то.
This is the hundredth anniversary of the university's founding — a big celebration is in preparation.
Compound ordinals: only the LAST word is ordinal
Here is the rule that surprises everyone, and it is the mirror image of how cardinals work. In a compound cardinal, every part can decline (двадцяти́ п’яти́). But in a compound ordinal, only the final word takes the ordinal form — every earlier word stays a plain cardinal:
| Number | Ordinal phrase | Note |
|---|---|---|
| 21st | два́дцять пе́рший | два́дцять stays cardinal; only пе́рший is ordinal |
| 25th | два́дцять п’я́тий | п’ять → п’я́тий, but два́дцять unchanged |
| 153rd | сто п’ятдеся́т тре́тій | only тре́тій is ordinal |
| 1991st / "1991" | ти́сяча дев’ятсо́т дев’яно́сто пе́рший | only пе́рший is ordinal |
And when a compound ordinal declines, only that last word changes too — everything before it stays put: до два́дцять пе́ршого (with cardinal два́дцять frozen and only пе́рший inflecting to пе́ршого). This is far easier than declining a compound cardinal.
Він народи́вся ти́сяча дев’ятсо́т дев’яно́сто пе́ршого ро́ку — у рік незале́жності.
He was born in nineteen ninety-one — the year of independence.
Dates, centuries, ranks: the ordinal at work
Ordinals are the backbone of dates and named periods. A date is an ordinal in the genitive + the month in the genitive: «пе́ршого тра́вня» "(on) the first of May," literally "of-the-first of-May." Centuries are ordinal + століття: «двадця́те століття» "the twentieth century."
Уро́ки почина́ються пе́ршого ве́ресня — це свя́то для всіх школярі́в.
School starts on the first of September — it's a holiday for all schoolchildren.
Шевче́нко — найбі́льший пое́т дев’ятна́дцятого столі́ття.
Shevchenko is the greatest poet of the nineteenth century.
Вона́ фінішува́ла дру́гою, всього́ за се́кунду від ліде́рки.
She finished second, just a second behind the leader.
The full date and year machinery — including why the year is in the genitive — is covered in Dates, Years and Centuries.
Source-language comparison
For an English speaker, the leap is that ordinals agree and decline. English "first" is invariable: "the first lesson, the first book, on the first floor." Ukrainian forces a gender and case match every time: пе́рший уро́к, пе́рша кни́га, на пе́ршому по́версі. The compensation is that you already know adjective endings, so no new paradigm is needed — except the soft тре́тій. Also note: where English abbreviates "21st," Ukrainian writes the ordinal in full or as a digit with no suffix, and the compound rule (only the last word ordinal) has no English parallel.
For a Russian speaker, the forms are close — Ukrainian пе́рший, дру́гий, тре́тій map onto Russian первый, второй, третий — but watch the Ukrainian-specific shapes: четве́ртий (Russian четвёртый), сьо́мий (Russian седьмой — different stem!), во́сьмий (Russian восьмой), and тре́тій with its soft Ukrainian endings (тре́тього, which differs from the Russian третьего pattern). And dates: Ukrainian uses the ordinal in the genitive (пе́ршого тра́вня), structurally like Russian, but the month names and spellings differ.
Common Mistakes
❌ пе́рший кни́га / на пе́рший по́версі
Incorrect — ordinals agree like adjectives: feminine пе́рша кни́га; locative на пе́ршому по́версі.
✅ пе́рша кни́га, на пе́ршому по́версі
the first book, on the first floor — agreement in gender and case.
❌ двадця́та пе́рша кни́га (both words made ordinal)
Incorrect — in a compound ordinal only the LAST word is ordinal; the rest stay cardinal: два́дцять пе́рша кни́га.
✅ два́дцять пе́рша кни́га
the twenty-first book — only пе́рша is ordinal; два́дцять stays cardinal.
❌ тре́того тра́вня / на тре́тому по́версі (hard endings on третій)
Incorrect — тре́тій is soft-stem: тре́тього тра́вня, на тре́тьому по́версі (with ь).
✅ тре́тього тра́вня, на тре́тьому по́версі
on the third of May, on the third floor — soft-stem endings.
❌ о пе́рша годи́на (nominative for 'at one o'clock')
Incorrect — the time takes the locative: о пе́ршій годи́ні.
✅ о пе́ршій годи́ні
at one o'clock — locative feminine ordinal.
❌ ти́сяча дев’ятсо́т дев’яно́сто пе́рший рік з усіма порядковими
Incorrect if earlier words are made ordinal — only пе́рший is ordinal; ти́сяча, дев’ятсо́т, дев’яно́сто stay cardinal.
✅ ти́сяча дев’ятсо́т дев’яно́сто пе́рший рік
the year 1991 — only the last word, пе́рший, is ordinal.
Key Takeaways
- Ordinals are adjectives: they agree in gender, number and case (пе́рший / пе́рша / пе́рше / пе́рші) and decline like ordinary adjectives.
- пе́рший and дру́гий are suppletive; from 4th the ordinal builds on the cardinal stem (четве́ртий, п’я́тий, сьо́мий, во́сьмий).
- тре́тій is the lone soft-stem ordinal (тре́тього, тре́тьому, тре́тій) — declines like си́ній.
- In a compound ordinal, only the last word is ordinal and only it declines (два́дцять пе́рший → до два́дцять пе́ршого); everything before stays a frozen cardinal. Hence 1991 = ти́сяча дев’ятсо́т дев’яно́сто пе́рший.
- Ordinals power dates (пе́ршого тра́вня), floors (на тре́тьому по́версі), centuries (двадця́те століття), and the time (о пе́ршій годи́ні).
Now practice Ukrainian
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Start learning Ukrainian→Related Topics
- Cardinal Numbers 1–20A1 — The numbers нуль to два́дцять — with the gendered оди́н/одна́/одне́ and два/дві, the fused -на́дцять teens, and the apostrophe/soft-sign spelling traps (п’ять, шість, ві́сім, де́в’ять) that make Ukrainian numerals an orthography test from day one.
- Tens, Hundreds, and Large NumbersA2 — The tens (два́дцять…дев’яно́сто), the hundreds (сто…дев’ятсо́т), and ти́сяча / мільйо́н / мілья́рд — featuring the three irregulars every learner must memorize (со́рок, дев’яно́сто, дві́сті), the -деся́т and -со́т compounding, and the crucial fact that ти́сяча and мільйо́н are NOUNS that govern the genitive plural.
- Dates, Years, and CenturiesB1 — A full Ukrainian date is a chain of GENITIVES — day-ordinal + month + year-ordinal + ро́ку (деся́того тра́вня дві ти́сячі два́дцять четве́ртого ро́ку) — but 'in (a year)' switches to the LOCATIVE (у дві ти́сячі два́дцять четве́ртому ро́ці). Only the last word of the compound number is the ordinal; centuries use ordinals (XXI = два́дцять пе́рше столі́ття).
- Telling the TimeA2 — Ukrainian clock-telling runs on feminine ordinals (because годи́на 'hour' is feminine): the hour is пе́рша/дру́га годи́на, 'at' an hour is о + locative (о п’я́тій), 'half past' counts TOWARD the next hour (пів на тре́тю = 2:30), 'quarter/minutes past' use на + accusative of the coming hour, and 'to' the hour uses за + nominative — a system built on ordinals and prepositions, not the cardinal clock of English.
- Soft-Stem Adjective DeclensionB1 — The small but high-frequency soft-stem class — си́ній, да́вній, дома́шній, сусі́дній and the rest of the -ній family — runs a paradigm parallel to the hard stem but carries the SOFT series of endings throughout: -ього not -ого, -ьому not -ому, -ім not -им, -іх not -их. Once you know which adjectives are soft, you apply one extra rule and the whole declension follows.
- Hard-Stem Adjective DeclensionA2 — The full declension of hard-stem adjectives (the нови́й 'new' type) across all seven cases, three singular genders, and the plural. The endings — -ого, -ому, -им, -ою, -их, -ими — are the same set you meet on demonstratives and most pronouns, so learning нови́й unlocks the agreement endings for той, котри́й, and the bulk of the adjective system at once. Includes the velar-stem spelling (вели́кий → вели́кого but вели́кі) and the animacy split in the masculine and plural accusative.