Number Prefixes

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Across
  1. 2. 3 times
  2. 8. together
  3. 9. everything
  4. 11. a place of higher learning
  5. 12. used with a camera
  6. 13. every two weeks or twice a week
  7. 16. two languages
  8. 17. 100 years
  9. 19. three parts
  10. 20. three wheels bike
Down
  1. 1. a hundred legs insect
  2. 3. comes in a group of three things
  3. 4. two wheels bike
  4. 5. three twins
  5. 6. one wheel bike
  6. 7. a hundred per meter
  7. 8. bring together
  8. 10. to watch birds
  9. 14. has three angles
  10. 15. everyone wears the same clothes
  11. 16. divide in two parts
  12. 18. mystical creature