The right pronunciation of “thirty” is “THIR-tee”. The stress is on the primary syllable, and the “r” is pronounced with a slight trill. It’s a frequent phrase that’s used to explain the quantity 30.
It is very important pronounce “thirty” accurately as a way to be understood clearly. Mispronouncing the phrase can result in confusion and errors in communication. Moreover, announcing “thirty” accurately might help to enhance your general pronunciation abilities.