singular  |  plural  |  translation  |  
der Schuh  |  die Schuhe  |  shoe / shoes  |  
das Wort  |  die Worte  |  word / words  |  
das Problem  |  die Probleme  |  problem / problems  |  
2. way: add a "n" to the noun
singular  |  plural  |  translation  |  
die Straße  |  die Straßen  |  street / streets  |  
die Schule  |  die Schulen  |  school / schools  |  
der Name  |  die Namen  |  name / names  |  
3. way: add a "s" to the noun
singular  |  plural  |  translation  |  
der Park  |  die Parks  |  park / parks  |  
das Hotel  |  die Hotels  |  hotel / hotels  |  
die Kamera  |  die Kameras  |  camera / cameras  |  
4. way: add an "en" to the noun
singular  |  plural  |  translation  |  
der Student  |  die Studenten  |  student / students  |  
das Bett  |  die Betten  |  bed / beds  |  
die Tür  |  die Türen  |  door / doors  |  
5. way: add a "er" to the noun
singular  |  plural  |  translation  |  
das Ei  |  die Eier  |  egg/ eggs  |  
das Kind  |  die Kinder  |  child / children  |  
der Geist  |  die Geister  |  ghost / ghosts  |  
6. way: add a "se" to the noun
singular  |  plural  |  translation  |  
das Zeugnis  |  die Zeugnisse  |  school report / school reports  |  
das Erlebnis  |  die Erlebnisse  |  experience / experiences  |  
das Verhältnis  |  die Verhältnisse  |  relationship / relationships  |  
singular  |  plural  |  translation  |  
die Freundin  |  die Freundinnen  |  friend / friends (female)  |  
die Ärztin  |  die Ärztinnen  |  doctor / doctors (female)  |  
die Studentin  |  die Studentinnen  |  student / students (female)  |  
8. way: add nothing to the noun. Singluar and plural are the same
singular  |  plural  |  translation  |  
der Fehler  |  die Fehler  |  mistake / mistakes  |  
der Schüler  |  die Schüler  |  pupil / pupils  |  
das Fenster  |  die Fenster  |  window / windows  |  
9. way: change the stem vowel
singular  |  plural  |  translation  |  
die Tochter  |  die Töchter  |  daughter/ daughters  |  
der Vater  |  die Väter  |  father / fathers  |  
der Bruder  |  die Brüder  |  brother / brothers  |  
10. way: change the stem vowel and add an "e" to the noun
singular  |  plural  |  translation  |  
der Fuß  |  die Füße  |  foot / feet  |  
die Stadt  |  die Städte  |  city / cities  |  
der Sohn  |  die Söhne  |  son / sons  |  
11. way: change the stem vowel and add an "er" to the noun
singular  |  plural  |  translation  |  
das Wort  |  die Wörter  |  word / words  |  
der Mann  |  die Männer  |  man / men  |  
das Buch  |  die Bücher  |  book / books  |  
12. way: irregular change of the noun
singular  |  plural  |  translation  |  
das Datum  |  die Daten  |  date / dates  |  
der Bus  |  die Busse  |  bus / buses  |  
die Firma  |  die Firmen  |  company / companies  |  
last hints
As you already recognized the article of the plural nouns always is: die It doesn't matter if the singular form has "der", "die" or "das" for an article.When we learn a new word I will always give you the plural form too. To save space we will shorten the plural form this way: 
 If there is more than one vowel in a noun then I marked the vowel which has to be changed: der Anzug -> die Anzüge (suit/suits) marked as: ¨ (2nd), +e  |