Breakdown of Какого числа твой день рождения?
день
day
твой
your [informal] (твой, твоя, твоё)
какой
which/what kind of (m, sister forms: какая, какое)
число
number, date
рождение
birth
день рождения
birthday
Questions & Answers about Какого числа твой день рождения?
Why is it какого числа instead of какое число?
Russian uses the Genitive case to ask 'on what date' something happens. Какого числа literally means 'of what number' or 'of what date'. If you just want to ask what today's date is, you would use the Nominative case: Какое сегодня число?
Why is the 'г' in какого pronounced like a 'v'?
In Russian, the Genitive masculine and neuter endings -ого and -его are always pronounced with a 'v' sound instead of a 'g'. So, какого is pronounced as if it were written 'каково'.
Why is the word рождения in the Genitive case here?
The phrase день рождения literally translates to 'day of birth'. Whenever you want to connect two nouns like 'noun OF noun' in English, the second Russian noun takes the Genitive case. So the neuter noun рождение (birth) becomes рождения.
Why do we use the masculine твой (your) if рождение is a neuter word?
The possessive word твой must agree with the main noun of the phrase, which is the masculine word день (day). It does not agree with рождения (birth), which is just acting as a descriptor to tell us what kind of day it is.
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