Numbers Brainteaser

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Across
  1. 2. number of sides on a stop sign
  2. 6. number of days in a week
  3. 8. number of signs in the zodiac
  4. 9. number of letters in the alphabet
  5. 13. number of players on a football team
  6. 14. number of hours in a day
  7. 15. number of days in February with a leap year
  8. 17. number of squares on a checkboard
  9. 18. number of degrees in a right angle
  10. 19. number of piano keys
Down
  1. 1. number of degrees at which water freezes
  2. 3. number of cards in a deck
  3. 4. number of stripes on an American flag
  4. 5. number of holes on a golf course
  5. 7. number of ounces in a pound
  6. 10. number of planets in the solar system
  7. 11. number of wheels on a unicycle
  8. 12. number of digits in a zip code
  9. 16. number of blind mice