oct-, cent-

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Across
  1. 3. the 10th month of the year
  2. 6. a person who is between 80 and 89 years old
  3. 8. one part in a hundred : an amount that is equal to one one-hundredth of something
  4. 9. a 200th anniversary or its celebration
  5. 10. a sea animal that has a soft body and eight long arms
  6. 11. a person who is 100 years old or older
Down
  1. 1. a song or piece of music performed by eight singers or musicians
  2. 2. a measurement of temperature; another term for Celsius
  3. 3. a flat shape that has eight sides and eight angles
  4. 4. the difference in sound between the first and eighth note on a musical scale
  5. 5. a length equal to one hundredth of a meter
  6. 7. a period of 100 years