twenty-one

https://tts.langeek.co/read?text=dHdlbnR5LW9uZQ&hash=a8bce3b133a49af58d071c9ececa1ca24a138221&lang=en&cache-only=0&driver=googletts

Here you will find the vocabulary from Unit 1 - 1B in the English Result Elementary coursebook, such as "twenty-three", "seventy", "hundred", etc.