Across
- 3. The number 0
- 4. The number 6
- 5. The number 14
- 6. The number 12
- 8. The number 21
- 9. The number 8
- 13. The number 13
- 14. The number 17
- 17. The number 7
- 18. The number 1
- 20. The number 9
Down
- 1. The number 4
- 2. The number 18
- 6. The number 16
- 7. The number 5
- 10. The number 11
- 11. The number 19
- 12. The number 20
- 13. The number 3
- 15. The number 2
- 16. The number 10
- 19. The number15