Las once treinta y uno.
The more formal way, which is often requested in US American Spanish-Language Classes is "Las doce menos véintinueve". The above is becoming more common as people move away from using analog clocks to digital ones.
It's 10:30= Son las diez y media. at 10:30= ...a las diez y media
30=treinta
Treintatreinta
Strangely enough, there is no word in Spanish to represent sock. To say socks in Spanish, you say "medias", but you cannot say "media" because media means 30, as in 2:30.
diez
How to say 9:30 in Spanish
Ojalá tuviese 30 años menos
Tengo diez años
El precio/valor es 10
Cena para diez
On the Up - 2007 Spanish Albums 1-10 was released on: USA: 30 January 2007
30 de mayo (treinta de mayo)