This video covers examples of how German numbers work from twenty-one to sixty.

The examples are:

twenty-one - einundzwanzig
twenty-two - zweiundzwanzig
twenty-three - dreiundzwanzig
thirty - dreißig
thirty-one - einunddreißig
thirty-two - zweiunddreißig
forty - vierzig
forty-one - einundvierzig
fifty - fünfzig
sixty - sechzig