Compound numerals above twenty

Level 4

In modern Czech, compound numerals above 20 that end in 1, 2, 3, or 4 (like 21, 22, 153) behave like numerals 5 and above. They require the counted noun to be in the genitive plural.

How It Works

In modern Czech, compound numerals ending in 1, 2, 3, and 4 can behave like numbers 5 and above by forcing the noun into the genitive plural.

1. Nominative and Accusative Cases Only
This genitive plural rule applies only when the numeral phrase is in the nominative or accusative case.
Example: Na stole je dvacet dva knih. (There are twenty-two books on the table.)

2. Verb Agreement
Because the numeral acts as a quantifier, the subject is grammatically neuter singular. Therefore, past tense verbs must end in -o.
Example: Dvacet tři studentů se zúčastnilo. (Twenty-three students participated.)

3. Inverted Numerals (One-Word Forms)
Czech also has one-word inverted numerals (e.g., dvaadvacet, třiadvacet). Unlike the two-word forms, these strictly require the genitive plural for the noun (e.g., dvaadvacet knih, never dvaadvacet knihy).

4. The Frozen 'jedna' and 'dva'
When using the modern genitive plural shortcut for 21, 22, 31, 32, etc., the words jedna and dva are frozen and do not change gender. You can choose the traditional agreement (e.g., dvacet jeden student, dvacet dvě ženy) or the modern frozen shortcut (e.g., dvacet jedna studentů, dvacet dva žen). Note that if you use the traditional forms, they require standard verb agreement matching the noun's gender and number (e.g., Dvacet jeden student přišel.), unlike the neuter singular used with the genitive plural shortcut.

5. Oblique Cases (Prepositions)
In other cases (genitive, dative, locative, instrumental), you cannot use the genitive plural shortcut. Both the numeral and the noun must decline into the required case.
Example: Mluvil jsem s dvaceti třemi studenty. (I spoke with twenty-three students.) Note that inverted one-word numerals decline as a single word at the end (e.g., Mluvil jsem s dvaadvaceti studenty.).

6. Modern vs. Traditional Rules
Traditional grammar rules state that the noun must agree with the last digit (e.g., 21 + singular, 22-24 + nominative plural). While this traditional rule is still fully correct standard Czech and common in formal writing, modern Czech linguistics considers the genitive plural (dvacet tři studentů) to be a standard, natural, and neutral choice for contemporary speakers. The strict textbook rule is often viewed as formal, traditional, or slightly dated in spoken Czech.

Examples (4)

  1. Dvacet tři studentů se zúčastnilo exkurze.

    Twenty-three students took part in the excursion.

    Word by Word: Twenty three of-students itself participated of-excursion.

    Notice the neuter singular verb 'zúčastnilo' agreeing with the quantifier block.

  2. Na přednášku přišlo dvacet jedna studentů.

    Twenty-one students came to the lecture.

    Word by Word: On lecture came twenty one of-students.

    Even with a masculine noun like 'student', the numeral 'jedna' remains frozen in its feminine form when used in compound numerals.

  3. Koupil jsem dvaadvacet knih.

    I bought twenty-two books.

    Word by Word: Bought am twenty-two of-books.

    Inverted one-word numerals like 'dvaadvacet' strictly require the following noun to be in the genitive plural.

  4. Mluvil jsem s dvaceti třemi studenty.

    I spoke with twenty-three students.

    Word by Word: Spoke am with twenty three students.

    After the preposition 's' (with), the genitive plural rule is dropped. Both the numeral and the noun must be in the instrumental case.

Common Mistakes

  • Using a plural verb instead of the neuter singular when the compound numeral phrase is the subject.

    Dvacet tři studentů přišli.
    Dvacet tři studentů přišlo.

    When a noun is in the genitive plural after a numeral, the verb must take the default third-person neuter singular form (ending in -o in the past tense).

  • Using the genitive plural after prepositions that require a different case.

    Mluvil jsem o dvacet tři studentů.
    Mluvil jsem o dvaceti třech studentech.

    The genitive plural rule only applies in the nominative and accusative cases. In oblique cases (like the locative after 'o'), both the numeral and the noun must decline into that specific case.

How It Connects

Tap a pattern to see what it builds on and what it leads to.

Compound numerals above twentyLevel 4

Learn This First

To learn compound numerals above twenty, a learner must first understand the 'genitive of quantity' rule used with numerals five and higher. They also need to be familiar with how lower numerals (2-4) function to understand how compound structures (like 21, 22, 23, 24) differ or align with these basic counting rules.