Integer Crossword Puzzle

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123456789101112
Across
  1. 6. 23*(-13)=
  2. 8. 174+(-109)=
  3. 9. (-98)/(-8)=
  4. 12. (-688)/687=
Down
  1. 1. (-34)-12=
  2. 2. -2*6=
  3. 3. -90*(-30)=
  4. 4. 230-(-200)=
  5. 5. 89-39=
  6. 7. (-67)+60=
  7. 10. 589/(-24)=
  8. 11. 7+(-8)=