German · Pronunciation Guide
dee NOOM-uh. A short but properly rounded 'oo' and an -er ending that softens into 'uh'.
Weight up front, ending soft — the same heavy-light shape as Mutter, Fenster and Wetter. The plural Nummern simply adds an n to the softened ending, so nothing rhythmic changes at all between one number and several.
Listen: die Nummer
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Wie ist deine Nummer?
What's your number?
Listen: Wie ist deine Nummer?
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Wie ist deine Nummer? asks 'how is your number' rather than 'what is', which is the same idiom German uses for names. Deine takes the feminine ending, and wie opens the question on a v sound and a long 'ee'.
English number supplies an unrounded central vowel and a fully pronounced r, and both get carried across. German wants the lips rounded for a short back 'oo' and the ending reduced to a plain vowel. Say 'NOOM' then 'uh', with no tongue curling at the end.