Numbers

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Across
  1. 2. A group of four singers or musicians
  2. 5. Another name for the Celsius scale
  3. 7. To divide into three equal parts
  4. 8. A large black and orange butterfly
  5. 9. A four-line stanza in poetry
  6. 11. A contest with ten athletic events
  7. 12. A group of three rulers
  8. 13. A group of three related books or movies
Down
  1. 1. One-fourth of a circle
  2. 3. A 200th anniversary
  3. 4. destroy a large part
  4. 6. A 100th anniversary
  5. 10. Having two sides