Super Stars - More Number Prefixes

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Across
  1. 3. period of ten years
  2. 7. shape with five sides
  3. 8. group of four musicians or singers
  4. 10. two hundredth anniversary
  5. 14. amount out of one hundred
  6. 16. four babies born at the same time
  7. 17. group of eight musicians or singers
  8. 18. multiply by four
  9. 19. series of eight musical notes
  10. 20. one of four equal parts
Down
  1. 1. shape with four sides
  2. 2. shape with eight sides
  3. 4. number system based on ten
  4. 5. animal with four legs
  5. 6. unit of length equal to one hundredth of a metre
  6. 8. group of five performers
  7. 9. five babies born at the same time
  8. 11. one hundredth anniversary
  9. 12. period of one hundred years
  10. 13. sporting event with ten contests
  11. 15. perfect example of something