What does "thirty" mean in English for Spanish?

In English for Spanish, "thirty" means:

30

Listen to "thirty": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a word that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 3, Level 2, Scene 8
• English for Spanish 3, Level 2, Scene 9
• English for Spanish 3, Level 2, Scene 11
• English for Spanish 4, Level 2, Scene 4
• English for Spanish 4, Level 3, Scene 1
• English for Spanish 4, Level 3, Scene 3