Breakdown of В новой статье о трёхстах сорока восьми километрах окружности есть ошибка.
новый
new
в
in / to (direction)
о
about (о, об, обо)
статья
article
восемь
eight
есть
is, there is, to have
ошибка
mistake
километр
kilometre
сорок
forty
триста
three hundred
окружность
circumference
Questions & Answers about В новой статье о трёхстах сорока восьми километрах окружности есть ошибка.
Why is every single word in the number 348 declined here?
In Russian, when a compound cardinal number is in an oblique case (any case besides Nominative or Inanimate Accusative), every single word that makes up the number must be declined into that case. Here, трёхстах, сорока, and восьми are all in the prepositional case because of the preposition о.
How is the word for 300 (триста) formed in the prepositional case here?
Hundreds decline both parts of the word. The first part declines like the number three (три becomes трёх), and the second part declines like a plural noun in the prepositional case (ста becomes стах). Combined, you get трёхстах.
Why does the number 40 (сорок) take the ending -a here?
The numbers 40, 90, and 100 are unique because they only have two forms. They use their base form for the Nominative and Accusative cases, and add the ending -а for all other cases (Genitive, Dative, Instrumental, and Prepositional). Since this is the prepositional case, сорок becomes сорока.
I learned that numbers higher than four take the genitive plural. Why is километрах in the prepositional case?
Numbers only force the following noun into the genitive case when the number itself is in the Nominative or Inanimate Accusative. In all other cases (the oblique cases), the number and the noun simply agree in case. Since the preposition о requires the prepositional case, both the number and the noun (километрах) are in the prepositional plural.
Why does окружности end in -и here?
It is in the genitive case because it means 'of the circumference'. The word окружность is a feminine noun ending in a soft sign (a 3rd declension noun), and these nouns always take the -и ending in the genitive case.
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