die · Feminine (Femininum)A1Feminine DeclensionStudy & Grammar

die Nummer

number (phone/house/item)

Nominative Sg.die Nummer

Genitive Sg.der Nummer

Nominative Plural

die Nummern

Dative Pluralden Nummern

Gender / Plural CueLexical gender — memorize together with its article

Full 4-Case Declension Table

Switch determiner types to inspect how articles and noun endings change together.

Definite (der / die / das): Used for specific, already known, or general-category nouns.

Case (Fall)	Question	Singular	Plural
Nominative Nominativ (Werfall)	Wer oder was?	die Nummer	die Nummern
Accusative Akkusativ (Wenfall)	Wen oder was?	die Nummer	die Nummern
Dative Dativ (Wemfall)	Wem?	der Nummer	den Nummern
Genitive Genitiv (Wesfall)	Wessen?	der Nummer	der Nummern

Indefinite (ein / eine): Used when introducing a countable singular noun; has no plural article in German.

Case (Fall)	Question	Singular	Plural
Nominative Nominativ (Werfall)	Wer oder was?	eine Nummer	Nummern
Accusative Akkusativ (Wenfall)	Wen oder was?	eine Nummer	Nummern
Dative Dativ (Wemfall)	Wem?	einer Nummer	Nummern
Genitive Genitiv (Wesfall)	Wessen?	einer Nummer	Nummern

Negative (kein / keine): Negates nouns with or without an indefinite article; follows ein-words in singular and die in plural.

Case (Fall)	Question	Singular	Plural
Nominative Nominativ (Werfall)	Wer oder was?	keine Nummer	keine Nummern
Accusative Akkusativ (Wenfall)	Wen oder was?	keine Nummer	keine Nummern
Dative Dativ (Wemfall)	Wem?	keiner Nummer	keinen Nummern
Genitive Genitiv (Wesfall)	Wessen?	keiner Nummer	keiner Nummern

Possessive (mein / dein / …): Uses ein-word endings in singular and definite-like endings in plural (mein/dein/sein/ihr/unser/euer/Ihr).

Case (Fall)	Question	Singular	Plural
Nominative Nominativ (Werfall)	Wer oder was?	meine Nummer	meine Nummern
Accusative Akkusativ (Wenfall)	Wen oder was?	meine Nummer	meine Nummern
Dative Dativ (Wemfall)	Wem?	meiner Nummer	meinen Nummern
Genitive Genitiv (Wesfall)	Wessen?	meiner Nummer	meiner Nummern

Why These Endings Work

All feminine (die) nouns stay completely unchanged in the singular across Nominative, Accusative, Dative, and Genitive.

Feminine nouns never change their own ending in the singular across all four cases.
Plural "Nummern" already ends in -n or -s, so Dative plural stays Nummern.

Pattern summary: Only the article changes in singular (die / die / der / der); plural takes -n in Dative unless ending in -n or -s.

Example Sentences in Context

Nominative

Wie ist Ihre Nummer, bitte?

What is your number, please?

Dative

Unter dieser Nummer erreichen Sie mich jederzeit.

You can reach me at this number at any time.

Interactive Tools & Related Guides

Check "Nummer" in Der/Die/Das Checker Analyze in Compound Deconstructor Inspect Example in Sentence Analyzer

German Gender & ArticlesPredict der, die, das with high-frequency endings The Four German CasesNominative, Accusative, Dative, and Genitive roles Noun Plurals & Dative -nPlural patterns and the Dative plural -n rule Dative Case GuideIndirect objects, prepositions, and der + feminine nouns

FAQs: die Nummer

Is "Nummer" der, die, or das in German?

"Nummer" takes the feminine definite article "die" (die Nummer). Gender cue: Lexical gender — memorize together with its article.

What is the plural and Dative plural of "die Nummer"?

The Nominative plural of die Nummer is "die Nummern" (pattern: -n). In the Dative plural it becomes "den Nummern".

How does "die Nummer" change in the Genitive, Accusative, and Dative?

As a feminine noun, "Nummer" keeps the exact same stem in all four singular cases; only the article changes (die Nummer / die Nummer / der Nummer / der Nummer).