Negative and positive crosswords

Edit Answers
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Across
  1. 4. (-10+-20)
  2. 5. (85+-23)
  3. 6. (11+-4)
  4. 7. (-2+3)
  5. 9. (-5+15
  6. 10. (-3+2)
  7. 11. (12+-3)
  8. 12. (-10+-10)
Down
  1. 1. (-12+7)
  2. 2. (-500+200)
  3. 3. (2+-8)
  4. 8. (11+-3)