Ordinal numbers

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1234567891011121314151617181920
Across
  1. 3. sixteen
  2. 4. twenty
  3. 7. six
  4. 8. nineteen
  5. 9. twelve
  6. 10. ten
  7. 12. five
  8. 15. two
  9. 17. thirteen
  10. 18. twenty
Down
  1. 1. eight
  2. 2. seventeen
  3. 5. fifteen
  4. 6. seven
  5. 11. eighteen
  6. 13. four
  7. 14. nine
  8. 16. one
  9. 19. eleven
  10. 20. three