Ordinal numbers

123456789101112
Across
  1. 1. 2nd
  2. 3. 5th
  3. 5. 100th
  4. 6. 7th
  5. 10. 18th
  6. 12. 40th
Down
  1. 2. 90th
  2. 4. 1st
  3. 7. 19th
  4. 8. 10th
  5. 9. 12th
  6. 11. 3rd