English has two forms: "1 year", "2 years", "25 years". Russian has three: один год, два года, двадцать пять лет. The same goes for rubles, books, sisters: every noun after a number changes shape.
It looks like a puzzle. In reality there are only three patterns, and only one digit to look at.
🔢 The last-digit rule
To choose the form of the noun, look only at the last digit of the number:
| The number ends in… | Noun form | Examples |
|---|
| 1 | nominative singular | 1 год, 21 рубль, 31 сестра |
| 2, 3, 4 | genitive singular | 2 года, 23 рубля, 34 сестры |
| 5 to 9, or 0 | genitive plural | 5 лет, 20 рублей, 100 сестёр |
There's one exception, and it matters: 11 to 14 always take the genitive plural. 11 лет, 12 рублей, 14 сестёр. On paper they end in 1 to 4, but in speech they are separate words (одиннадцать, двенадцать…) that behave like 5.
Why 2, 3, 4 are special
It's a historical leftover. Old Russian had a dual, a special form for exactly two things, a bit like "a pair". The dual disappeared, but its trace stayed after 2 and spread to 3 and 4. That's why these three numbers form their own group.
🎂 Age: "to me" instead of "I am"
Russian doesn't say "I am 30". It says, literally, "to me 30 years": мне тридцать лет. The person goes into the dative: мне (to me), тебе (to you), ему (to him), ей (to her), маме (to Mom).
The word "year" follows the last-digit rule, which is where you'll hear it most often: мне двадцать один год, ему сорок три года, ей восемнадцать лет.
📖 A real example: the text "Меня зовут Рита"
Let's watch the rule in a real text. In "Меня зовут Рита" (My Name Is Rita) on Linguami, a student from Sochi introduces her family:
Моего брата зовут Данила, а сестёр – Настя и Таня. Даниле 25 лет, он архитектор. Насте и Тане 15 лет, они близнецы.
лет twice: 25 ends in 5, and 15 belongs to the 11 to 19 group, which always takes the genitive plural. Notice Даниле and Насте и Тане too: talking about age puts the person in the dative.
A little further on, Rita counts her whole family, and almost every form shows up:
Ещё у меня есть три тёти, два дяди, пять двоюродных братьев и две двоюродных сестры.
- три тёти: after 3, genitive singular.
- два дяди: дядя (uncle) ends in -я, but he's a man, so it's masculine: два, not две. Gender counts, not the ending.
- пять двоюродных братьев: after 5, genitive plural, and the adjective follows.
- две двоюродных сестры: after 2 the noun is genitive singular (сестры), but the adjective goes plural: genitive двоюродных, as here. With a feminine noun you'll also hear the nominative plural, две двоюродные сестры; both are correct. That's the next-level subtlety, covered in the lesson on numerals.
For money, the dialogue "В магазине электроники" (At the Electronics Store) is perfect. At the checkout: С вас 10750 рублей. The number ends in 0, so рублей. And the warranty: 1 год for the charger, 2 года for the laptop. Two forms of the same word in a single sentence.
In the full text, click any word to see its translation and grammatical form, including the case of each noun after a number.
⚠️ Common mistakes English speakers make
1. Thinking "singular vs plural"
❌ Мне 21 лет. ✅ Мне 21 год. In English, 21 is plural. In Russian, it ends in 1, so the noun is singular. Only the last digit counts.
2. Forgetting the 11 to 14 exception
❌ Ему 12 года. ✅ Ему 12 лет. From 11 to 14, always the genitive plural.
3. два with a feminine noun
❌ два сестры. ✅ две сестры. The number 2 has a feminine form, две, just like 1 (одна сестра).
4. Translating "I am 30" word for word
❌ Я 30 лет. ✅ Мне 30 лет. Age always uses the dative.
5. Reading a price as one big number
❌ 22 рублей. ✅ 22 рубля. On a price tag the number looks "big", but its last digit (here 2) still decides. 100 рублей, 101 рубль, 102 рубля.
⏰ Telling the time: the same rule
You'll use the last-digit rule every day to tell the time. Час (hour) and минута (minute) follow exactly the same pattern as год:
- Сейчас час. → It's one o'clock. (with 1, Russians usually just say час)
- Сейчас два часа. → It's two o'clock.
- Сейчас пять часов. → It's five o'clock.
- Поезд через двадцать одну минуту. → The train leaves in twenty-one minutes. Note одну: after через the phrase goes into the accusative, and 1 agrees with the feminine минута.
You may already have met it in another text: the surgeon in "Меня зовут Поль" wakes up в семь часов. 7 ends in 7, so genitive plural: часов.
🧮 "How many" without an exact number
Quantity words behave like 5 and above: genitive plural. много лет (many years), несколько раз (several times), сколько рублей? (how many rubles?). Add мало (few) and немного (a few), and it's the same rule as for big numbers.
🚀 Where to go next
- Numbers (0-20) and Age (A1): counting and saying your age.
- Numbers 20-100 and Money (A1): the tens, prices, рубль / рубля / рублей.
- Numerals: два/две, оба and agreement (A2), including the adjective after 2, 3, 4.
- The genitive plural (A2), the form you need after 5 and above.
Read next: Russian Cases Explained Simply, which introduces the genitive, the case you'll use most after numbers.
Not sure what your Russian level is? Take the free placement test and get texts and lessons matched to your level.
