Math

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Across
  1. 1. The opposite of -9
  2. 2. the opposite of -7
  3. 4. The opposite of -20
  4. 8. The opposite of -18
  5. 10. The opposite of -14
  6. 13. The opposite of -13
  7. 16. The opposite of -8
  8. 17. The opposite of -16
Down
  1. 1. The opposite of -19
  2. 3. The opposite of -1
  3. 5. The opposite of -2
  4. 6. The opposite of -17
  5. 7. The opposite of -4
  6. 9. The opposite of -10
  7. 10. The opposite of -5
  8. 11. The opposite of -12
  9. 12. The opposite of -15
  10. 14. The opposite of -11
  11. 15. The opposite of -6
  12. 18. The opposite of -3