Ответ:

Образуем порядковые числительные от количественных.

  1. One → first.
  2. Two → second.
  3. Three → third.
  4. Five → fifth.
  5. Eight → eighth.
  6. Nine → ninth.
  7. Twelve → twelfth.
  8. Twenty → twentieth.
  9. Thirty-one → thirty-first.
  10. Forty → fortieth.