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CaseSingularPlural
Nominativeименительный · кто? что?интерес интересы the subject: who or what acts
Accusativeвинительный · кого? что?интерес интересы the direct object of the verb
Genitiveродительный · кого? чего?интереса интересов possession, absence, "of"-phrases
Dativeдательный · кому? чему?интересу интересам the receiver: to or for someone
Instrumentalтворительный · кем? чем?интересом интересами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?интересе интересах location and topics: in, at, about

Интерес 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 интерес 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 интерес and every word like it with typed case endings, checked letter by letter.

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