Addition and Subtraction Puzzle

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1234567891011121314151617
Across
  1. 1. 87-36
  2. 4. 20+25
  3. 7. 50+39
  4. 8. 58-23
  5. 12. 28+14
  6. 14. 13+12
  7. 15. 20-11
  8. 16. 85-24
  9. 17. 39+10
Down
  1. 1. 96-56
  2. 2. 36-25
  3. 3. 25+25
  4. 5. 96-9
  5. 6. 28-12
  6. 9. 47-13
  7. 10. 87-69
  8. 11. 58-12
  9. 13. 90=24