Numerical Prefixes

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Across
  1. 3. A vehicle with one wheel.
  2. 4. Five kids born at the same time.
  3. 5. A period of time lasting ten years.
  4. 7. Three kids born at the same time.
  5. 9. The set of four muscles in front of your thigh.
  6. 11. A vehicle with two wheels.
  7. 13. The twelfth month of the year.
  8. 15. A nine sided shape.
  9. 17. The eleventh month of the year.
  10. 18. The two hundredth celebration of something.
  11. 19. A five sided shape.
Down
  1. 1. A four sided shape.
  2. 2. An animal with eight legs.
  3. 6. A dinosaur with three horns.
  4. 8. The ninth month of the year.
  5. 9. Four kids born at the same time.
  6. 10. Six kids born at the same time.
  7. 12. A six sided shape.
  8. 14. To do something together at one time.
  9. 16. An eight sided shape.