Math thing idk

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Across
  1. 2. (-5)-10=
  2. 3. (-4)/2=
  3. 6. (-5)*5=
  4. 8. (-10)/10=
  5. 10. (-2)-11=
  6. 11. 5+(-1)=
Down
  1. 1. (-10)*4=
  2. 4. (-9)-10=
  3. 5. 12+(-2)=
  4. 6. (-10)*10=
  5. 7. 9+(-2)=
  6. 9. (-20)/4=