When you count from thirty to forty, you count pronouncing it thirty, thirty - one, thirty - two, thirty - three, thirty - four, thirty - five, thirty - six, thirty - seven, thirty - eight, thirty - nine, forty.
Some people count from thirty to forty, pronouncing it taity, taity - one, taity - two, taity - three, taity - four, taity - five, taity - six, taity - seven, taity - eight, taity - nine, fourty.
So choose either Thirty or Taity or Tai.
