numeral
thirteen
A1
dreizehn is the German cardinal number thirteen (numeric value 13). It’s invariable as a numeral and used in counting, dates, ages, prices, etc. Composition: drei + zehn. For ordinal use dreizehnte. Numbers aren’t declined; when used as adjectives before nouns they follow normal numeral agreement (e.g., dreizehn Jahre).
Examples
Mein Bruder ist dreizehn Jahre alt.
My brother is thirteen years old.
Zu Beginn des Projekts waren dreizehn Mitarbeiter beteiligt, als die Aufgaben verteilt wurden.
At the start of the project thirteen employees were involved when the tasks were assigned.
Details
Mnemonics
Picture the number 13 with a small '3' next to a '10' to remember the compound.
Combine 'drei' (three) + 'zehn' (ten) — thirteen is 3 + 10.
Notes
Compound numeral formed from 'drei' + 'zehn'.