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CaseSingularPlural
Nominativeименительный · кто? что?сумма суммы the subject: who or what acts
Accusativeвинительный · кого? что?сумму суммы the direct object of the verb
Genitiveродительный · кого? чего?суммы сумм possession, absence, "of"-phrases
Dativeдательный · кому? чему?сумме суммам the receiver: to or for someone
Instrumentalтворительный · кем? чем?суммой суммами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?сумме суммах location and topics: in, at, about

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

Look up any other word in the Russian declension tool, see where сумма 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 сумма and every word like it with typed case endings, checked letter by letter.

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