The Fun They Had

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Across
  1. 4. Expecting or wishing; being optimistic
  2. 5. Mathematics dealing with numerical calculations
  3. 9. Sadly unsuccessful
  4. 10. To make a mathematical computation
Down
  1. 1. Coming into conflict with
  2. 2. Grandness
  3. 3. Altered to accommodate to certain requirements
  4. 5. To a complete degree or full extent
  5. 6. In a manner of great sadness
  6. 7. An investigator who observes carefully
  7. 8. In a composed or unconcerned manner