Counting in Czech: Why the Endings Change at Five | A2 Zkouška

You learn jedna, dvě, tři and start counting. Then a price tag or a conversation about age introduces a surprise: jedna koruna, dvě koruny, pět korun. Why does the word for the thing you are counting keep changing?

This is skloňování, or declension: changing the form of a noun, adjective, pronoun, or numeral to express grammatical case and number. With Czech quantities, the number itself helps determine the noun's form.

First, Learn the Numbers

0–5: nula, jeden, dva, tři, čtyři, pět.
6–10: šest, sedm, osm, devět, deset.
11–15: jedenáct, dvanáct, třináct, čtrnáct, patnáct.
16–20: šestnáct, sedmnáct, osmnáct, devatenáct, dvacet.
Tens: třicet, čtyřicet, padesát, šedesát, sedmdesát, osmdesát, devadesát.
100 and 1,000: sto and tisíc.

For 21, put the tens first: dvacet jedna. For 35: třicet pět. Czech also has reversed forms such as jednadvacet; you can learn to recognize these after you are comfortable with the first pattern.

One, Two to Four, Five and Up

Start with ordinary whole-number quantities in the nominative, the case used when naming things:

1: jeden obchod, jedna koruna, jedno město — one shop, crown, town.
2: dva obchody, dvě koruny, dvě města.
3–4: tři obchody, čtyři koruny, čtyři města.
5–10: pět obchodů, šest korun, deset měst.

With one, use a singular noun. The numeral agrees with its gender: jeden for masculine, jedna for feminine, jedno for neuter.

With two, use dva for masculine nouns and dvě for feminine and neuter nouns. With two, three, and four, the noun is nominative plural in this naming pattern.

Starting at five, the noun changes to genitive plural, the second case: obchodů, korun, měst. The change starts at five, not at six. There is no single ending you can attach to every noun: some add -ů, some lose a vowel, and some have other changes.

Learn useful sets together: lístek – dva lístky – pět lístků and minuta – dvě minuty – pět minut.

Why Does Five Behave Differently?

There is a historical reason for this split. In older Czech, the numerals five through ten behaved like nouns naming quantities. The things being counted followed in the genitive, rather like the relationship in English “a group of people.” The smaller numerals had different grammatical patterns. This noun-like history helps explain the modern boundary at five. See Pavel Kosek's historical grammar chapter on Czech numerals.

As a memory aid, think of pět knih as “a quantity of five books.” That is a learning analogy, not a literal translation: ordinary English simply says “five books.”

You can also hear the distinction in verbs: Dvě knihy jsou na stole (Two books are on the table), but Pět knih je na stole (Five books are on the table).

Does Five Always Mean Genitive?

No. The rule above applies to these quantities in nominative and accusative constructions. For example:

Tady jsou dvě knihy. — Here are two books.
Mám dvě knihy. — I have two books.
Tady je pět knih. — Here are five books.
Mám pět knih. — I have five books.

Other cases change the whole expression. Compare pět studentů with s pěti studenty (with five students). The preposition s here requires instrumental, so studentů becomes studenty, and pět becomes pěti. Similarly, o pěti studentech means “about five students.” The CzechEncy entry on genitive with numerals explains this distinction.

Even one changes in a sentence: jedna káva becomes Dám si jednu kávu — I'll have one coffee. If cases are new to you, start with our beginner's guide to Czech cases.

What About 11, 21, and 22?

The teens take genitive plural: jedenáct korun, dvanáct korun, čtrnáct korun. Do not apply the rule only to the last digit.

With compound numbers such as 21 and 22, modern Czech allows the practical pattern dvacet jedna korun, dvacet dva korun. You may also meet agreement with the final unit: dvacet jedna koruna, dvacet dvě koruny. For a beginner, the genitive-plural pattern is a useful starting point. See the Czech A2 reference description for compound numeral constructions.

The Curious Case of Years: Rok, Roky, Let

For ordinary statements of age or duration, learn this sequence:

jeden rok — one year.
dva roky, tři roky, čtyři roky — two, three, four years.
pět let, deset let, dvacet let — five, ten, twenty years.

Let is not simply rok with a new ending. It is the genitive plural of léto, a word you probably know as “summer.” Historically, léto also meant a whole year; the Czech Language Institute's Old Czech dictionary entry records both meanings. Modern Czech preserves that year meaning in expressions such as pět let.

Useful sentences:

Synovi jsou dva roky. — My son is two years old.
Dceři je pět let. — My daughter is five years old.
Je mi třicet let. — I am thirty years old.
Bydlím v Česku čtyři roky. — I have lived in Czechia for four years.
Bydlím v Česku pět let. — I have lived in Czechia for five years.

The ordinary genitive plural roků exists too; pět let is the everyday pattern to learn first. And let is not restricted to numbers above four: do dvou let means “within two years,” because do requires genitive. You will also hear před pěti lety — five years ago.

Try It Yourself

Fill the gaps with a form of the word in brackets:

Dám si jednu ___ . (káva)
Potřebuju tři ___ . (lístek)
Čekám pět ___ . (minuta)
Bydlím tady čtyři ___ . (rok)
Je mi dvacet pět ___ . (rok, use the everyday age expression)
Mluvím s pěti ___ . (student)

Answers: 1. kávu; 2. lístky; 3. minut; 4. roky; 5. let; 6. studenty.

Make Czech Endings Part of Your Daily Practice

Reading the rule is a start. Recalling it while ordering coffee, buying tickets, or talking about your family takes practice. Spend a few minutes saying useful quantities aloud, then build on that habit with grammar and vocabulary exercises in A2 Zkouška.

Choose an A2 Zkouška subscription and make regular Czech practice part of your preparation. Start today with three sentences: something you need one of, something you need two of, and something you need five of.