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