Across
- 3. nine
- 6. second
- 8. twice
- 9. fifty-one
- 10. ___cycle- three-wheeled bike
- 13. two
- 14. ___form-remaining the same in all cases
- 15. first
- 16. 210
- 17. third
Down
- 1. ninth
- 2. _____centennial-150th anniversary
- 4. half
- 5. fifth
- 7. ___gram-1000 grams
- 9. this year's super bowl
- 10. also known as tettra
- 11. seven
- 12. 19
- 13. X or 10