Compound Numerals by Final Element

Ukrainian syntax uses a 'final element' rule for quantities. Even if you are talking about a large number of items, the noun behaves as if only the last word exists.

1. The 'One' Rule: If the number ends in один (21, 51, 101), the noun stays singular. Note that 'один' must agree in gender with the noun (e.g., двадцять одна книжка [twenty-one books]). Adjectives also take the singular form. Note: If the noun is plural-only (pluralia tantum), it remains plural and the numeral takes the plural form одні (e.g., двадцять одні ножиці [twenty-one scissors]).

2. The '2, 3, 4' Rule: If the number ends in два, три, or чотири (22, 33, 44), the noun takes the Nominative Plural. Stress Nuance: Many nouns in this position retain the stress of the Genitive Singular rather than the standard Nominative Plural (e.g., три сестрИ [three sisters] vs. the standard plural сЕстри). For masculine and neuter nouns, adjectives can take the Nominative or Genitive Plural (e.g., два нових відра [two new buckets]). For feminine nouns, the Nominative Plural is the standard form for adjectives (e.g., дві нові книжки). Pluralia Tantum Note: Nouns that only have a plural form (like ножиці [scissors]) cannot be used directly with these numerals in compound forms. Instead, use the word пари [pairs] (e.g., двадцять дві пари ножиць) or rephrase the sentence.

3. The '5-9, 0, and Teens' Rule: If the number ends in 5 through 9, or 0 (20, 30, 55), or if the last word is a 'teen' (11-19), the noun must be in the Genitive Plural.

Important Nuances: These rules apply when the whole phrase is the subject (Nominative) or an inanimate direct object (Accusative). For animate nouns, the Accusative case follows the Genitive rule: the noun and the last word of the numeral take the Genitive form (e.g., бачу двадцять двох студентів [I see twenty-two students]). In oblique cases (Genitive, Dative, Instrumental, Locative), the 'final element' rule still applies but changes: for numbers ending in 2-9 and 0, the noun simply declines in the plural, and the numeral agrees with it in case (e.g., Dative: двадцяти двом студентам [to twenty-two students]). However, for compound numbers ending in 1, the noun remains in the singular form and declines accordingly (e.g., Dative: двадцяти одному студенту [to twenty-one students]). If the word order is inverted to show approximation (noun before numeral), the noun changes to the Genitive Plural, even for numbers ending in 2, 3, and 4 (e.g., років двадцять два [about twenty-two years]).