What has eight arms and lots of ink [atrament] but can't write?

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Across
  1. 3. thirty - thirteen =
  2. 4. How many HOURS are in a DAY?
  3. 6. How many DAYS are in 2 WEEKS?
  4. 9. 100 -- 1 =
  5. 10. seventy-eight + nine =
Down
  1. 1. twenty-six + twenty-seven =
  2. 2. How many DAYS are in 1 WEEK?
  3. 5. How many DAYS are in December?
  4. 7. How many MONTHS are in a YEAR?
  5. 8. How many MINUTES are in 1 HOUR?