Is Rolltreppe der, die or das?

The correct German article for Rolltreppe is die. The noun Rolltreppe is Feminine. So you always say: die Rolltreppe. Learn the article together with the noun — German nouns don't follow predictable gender rules most of the time.

The plural of Rolltreppe is: die Rolltreppen. In the plural, every German noun takes the article "die". So: die Rolltreppen. Example: ein Rolltreppe → zwei Rolltreppen.

Correct: die Rolltreppen. The form "die Rolltreppes" is wrong. The plural of die Rolltreppe is die Rolltreppen. In the nominative plural, you always use the article "die".

die Rolltreppe follows the four German cases. Nominative: die Rolltreppe, Accusative: die Rolltreppe, Dative: der Rolltreppe, Genitive: der Rolltreppe. In plural: die Rolltreppen / den Rolltreppen. Learn these forms together with the noun.

The genitive singular of die Rolltreppe is: der Rolltreppe. The genitive plural is der Rolltreppen. German uses the genitive to express possession or belonging. Example: die Farbe der Rolltreppe.

The dative plural of Rolltreppe is: den Rolltreppen. In German, dative plural nouns usually end in "-n". So you say: "mit den Rolltreppen". Use this case after prepositions like mit, von, bei, zu.

Rolltreppe ends in -e. German nouns with this ending are almost always feminine. Nouns ending in -e are often feminine (die), especially two-syllable words. That's why the article for Rolltreppe is die.

Rolltreppe is a noun and must be capitalized in German. You'll find example sentences above for each case. The article die stays the same in nominative singular but changes in other cases. Practice declension in your own sentences.

Yes, Rolltreppe is a noun (also called a substantive). German nouns are always capitalized. The article for Rolltreppe is die. Every German noun has a fixed article you must memorize.