Numbers Take the Partitive Singular: kaksi kissaa | Finnish Grammar

If you learn only one thing about Finnish numbers, learn this: after any cardinal number greater than one, the counted noun goes into the partitive singular — and stays singular. Kaksi kissaa is, word for word, "two of-cat". This runs exactly opposite to English, where "two cats" is plural, so it is the single hardest instinct to retrain. Every price, every measurement, every count you ever produce in Finnish rides on this rule.

One is the exception; two and up switch

The number yksi ("one") behaves like English: it takes the plain nominative, and the noun is singular.

Pöydällä on yksi omena.

There's one apple on the table.

From two upward, the noun flips to the partitive singular — and there it stays, for kaksi, kolme, kymmenen, sata, tuhat, everything:

Pöydällä on kaksi omenaa.

There are two apples on the table.

Burn the minimal pair into memory, because the switch happens precisely at two: yksi omena (nominative) → kaksi omenaa (partitive). Say them back to back until the jump feels automatic.

Otan yhden kahvin, hän ottaa kaksi kahvia.

I'll have one coffee, she'll have two coffees.

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Think of the number as the boss of the phrase and the noun as its complement. The number already tells you "how many", so Finnish does not also mark the noun as plural — it marks it as partitive singular, the case Finnish uses for "an amount of" something. That is why kaksi kissaa literally reads like "two [helping] of cat".

Why the partitive, and why singular

The partitive is Finnish's case for a quantity of something — a portion, an amount, an unbounded measure. A number is precisely a statement of quantity, so it slots the noun into exactly that role. Crucially, the noun names the kind of thing, not a set of separate items, so it stays singular. Kolme taloa is "three of house" — three helpings of the category "house" — not "three houses" as three grammatically plural objects.

This is why the singular survives even at enormous numbers:

Phrase	Meaning	Noun
yksi vuosi	one year	nominative singular
kaksi vuotta	two years	partitive singular
kymmenen vuotta	ten years	partitive singular
sata vuotta	a hundred years	partitive singular
tuhat vuotta	a thousand years	partitive singular

Olen asunut Helsingissä viisi vuotta.

I've lived in Helsinki for five years.

Kokeeseen on aikaa kymmenen minuuttia.

There are ten minutes left for the exam.

Torilla oli tuhat ihmistä.

There were a thousand people at the market square.

Note the gradation-affected forms: vuosi → partitive vuotta, ihminen → ihmistä. The stem may look nothing like the nominative, but the rule is unchanged — the number still demands the partitive singular, whatever that form happens to be.

Vowel harmony rides on the noun, not the number

The partitive ending obeys vowel harmony, and it follows the noun's own vowels — never the number's. So one sentence can carry both a back and a front ending side by side:

Söin kaksi omenaa ja join kolme lasillista vettä.

I ate two apples and drank three glasses of water.

Here omenaa takes a back -a (from omena) while vettä takes a front -ä (from vesi), even though both are governed by numbers. Each noun answers only to itself.

The whole phrase can move to another case

So far the number phrase has been a subject or a plain object, sitting in its counting form. But the moment the entire "number + noun" phrase is pulled into some other case — by a location, a postposition, or a verb that demands it — the partitive gives way and both parts take the new case, with the noun now singular in that case:

Counting form	In another case	Meaning
kaksi taloa	kahdessa talossa	in two houses (inessive)
kolme lasta	kolmelle lapselle	to three children (allative)
viisi euroa	viidestä eurosta	from/about five euros (elative)

Perhe mahtuu hyvin kahteen huoneeseen.

The family fits comfortably into two rooms.

The partitive singular is specifically the counting form; it is not welded to numbers forever. When and exactly how the number itself declines — kaksi → kahden → kahdessa — is the subject of the declining numbers page, and how to tell which regime applies from the phrase's role is on number agreement.

Common Mistakes

❌ Ostin kaksi omenat.

Incorrect — the English plural is a trap; after a number the noun is partitive singular: kaksi omenaa.

✅ Ostin kaksi omenaa.

I bought two apples.

❌ Se maksaa sata euroja.

Incorrect — the noun stays singular even after sata: sata euroa, not the plural euroja.

✅ Se maksaa sata euroa.

It costs a hundred euros.

❌ Pöydällä on kolme kissa.

Incorrect — above one, the noun must be partitive: kolme kissaa.

✅ Pöydällä on kolme kissaa.

There are three cats on the table.

❌ Olen odottanut viisi minuuttaa.

Incorrect — the partitive of minuutti keeps the stem's -i-: minuuttia, not minuuttaa.

✅ Olen odottanut viisi minuuttia.

I've waited five minutes.

❌ Kaksi omena riittää.

Incorrect — omitting the partitive ending entirely; it must be kaksi omenaa.

✅ Kaksi omenaa riittää.

Two apples is enough.

Key Takeaways

yksi takes the nominative (yksi omena); every number above it takes the partitive singular (kaksi omenaa, sata euroa).
The noun stays singular at any size — tuhat ihmistä, never tuhat ihmisiä.
The partitive ending follows the noun's harmony (omenaa back, vettä front), not the number's.
Gradation-changed stems still take the partitive singular: vuosi → viisi vuotta.
When the whole phrase leaves the nominative for another case, both parts take it and the noun is singular there (kahdessa talossa) — no longer the partitive.

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