'shun' suffixes

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Across
  1. 4. addition subtraction multiplication and ?
  2. 5. a person from Croatia
  3. 7. a gift to a charity
  4. 8. somebody who knows about electricity
  5. 9. part of something eg a half or a quarter
  6. 10. these people built the pyramids
Down
  1. 1. something you give when a thing is allowed
  2. 2. when something bursts out - like a bomb
  3. 3. a debate about something
  4. 6. somebody who can do tricks