20 points Main course

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Across
  1. 1. (-44)+74
  2. 3. (-5)(-5)
  3. 7. (-5)(2)
  4. 8. (-8)(4)
  5. 10. (-3)(3)
  6. 13. 10-(-1)
  7. 15. 5+(-5)-(-10)
  8. 16. 10-(-7)
  9. 17. 20-39
Down
  1. 1. (-72)/(-3)
  2. 2. 20-(-2)
  3. 4. 10+(-15)
  4. 5. (-40)/(-10)
  5. 6. 13+(-1)
  6. 8. (-30)/2
  7. 9. 25+(-10)
  8. 11. (-9)(-2)
  9. 12. 14+(-28)
  10. 14. (-7)(3)
  11. 18. (-7)+15