This one is plain and simple :3

Monday - Montag
Tuesday - Dienstag
Wednesday - Mittwoch
Thursday - Donnerstag
Friday - Freitag
Saturday - Samstag / Sonnabend
Sunday - Sonntag

The numbers:

0. Null
1. Eins
2. Zwei
3. Drei
4. Vier
5. Fünf
6. Sechs
7. Sieben
8. Acht
9. Neun
10. Zehn
11. Elf
12. Zwölf

Now it gets interesting. Germans say the last digit before the tenner digit.

13. Dreizehn
14. Vierzehn
...
17. Siebzehn (! not Siebenzehn)
...
20. Zwanzig

From this point the system changes again. Between oner and tenner digit comes the German word for and "und". Here 7 is used full as "Sieben" again.

21. Einundzwanzig
22. Zweiundzwanzig
...
30. Dreizig
40. Vierzig
...
70. Siebzig
...
100. Hundert
101. Hundertundeins
102. Hundertundzwei
...
1000. Tausend
1100. Tausendeinhundert (no "und" between 1000er and 100er digit)