Numerals crossword

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Across
  1. 1. colours in a rainbow
  2. 7. the number of letters in the English alphabet
  3. 10. the number of cents in a half-dollar
  4. 12. degrees in a right angle
  5. 15. teeth in the normal human mouth
  6. 16. a dozen
  7. 18. an unlucky number in European countries
  8. 19. the number of years in a millennium
  9. 20. the Celsius freezing point
Down
  1. 2. players in a football team
  2. 3. the number of cat’s lives
  3. 4. minutes in an hour
  4. 5. the Celsius boiling point
  5. 6. legs a bee has
  6. 8. legs an octopus has
  7. 9. days in April
  8. 11. minutes in a quarter of an hour
  9. 13. days in December
  10. 14. the number of hours in a day
  11. 17. books in a trilogy