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CaseSingularPlural
Nominativeименительный · кто? что?номер номера the subject: who or what acts
Accusativeвинительный · кого? что?номер номера the direct object of the verb
Genitiveродительный · кого? чего?номера номеров possession, absence, "of"-phrases
Dativeдательный · кому? чему?номеру номерам the receiver: to or for someone
Instrumentalтворительный · кем? чем?номером номерами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?номере номерах location and topics: in, at, about

Номер is a masculine noun; the ending pattern above repeats across most masculine nouns, so every table you learn makes the next one cheaper.

Look up any other word in the Russian declension tool, see where номер ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

12 forms is a table. Using them is a skill.

Slova drills номер and every word like it with typed case endings, checked letter by letter.

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