einhundert
one hundred
The cardinal number for the number 100.
Das Buch hat genau einhundert Seiten.
The book has exactly one hundred pages.

one hundred
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one hundred
The cardinal number for the number 100.
Das Buch hat genau einhundert Seiten.
The book has exactly one hundred pages.

In normal usage, people usually just say 'hundert' (hundred). The form 'einhundert' (one hundred) is mainly used when you want to avoid misunderstandings or when special precision is required.
Ich brauche noch hundert Gramm Käse.
I still need a hundred grams of cheese.
'Einhundert' (one hundred) is typical in formal or official contexts. You often find it on checks, in contracts, or when announcing sums of money in order to create absolute clarity.
Der Vertrag hat eine Laufzeit von einhundert Tagen.
The contract has a term of one hundred days.
'Einhundert' (one hundred) is the basis for all numbers from 101 to 199. The following number is attached directly, for example 'einhunderteins' (101) or 'einhundertzwanzig' (120).
Das Hotelzimmer hat die Nummer einhunderteins.
The hotel room has the number one hundred one.
hundred
'hundert' and 'einhundert' mean the same thing as exact numbers: 100. In everyday language, people usually say 'hundert'. 'einhundert' is a little more precise and is often used when you want to avoid misunderstandings, for example with money, forms, or when reading numbers aloud. They can be confused because both refer to the same number. The difference is mainly in how clear or official it should sound.

Auf dem Formular steht deutlich: einhundert Euro.
The form clearly says: one hundred euros.
Morgen bringe ich dir die hundert Euro zurück.
Tomorrow I'll bring you back the hundred euros.