Level 5: Don't Get Lost Naming Properties!!!!

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Across
  1. 2. 89(0)=0
  2. 3. 45(4+5)=45(4)+45(5)
  3. 6. 9(8)=8(9)
  4. 7. 75(45+67)=45(72+67)
  5. 8. -56+56=0
  6. 9. 3(2+5)=3(2)+3(5)
  7. 10. 8+0=8
Down
  1. 1. 100(0)=0
  2. 4. 20+(-20)=0
  3. 5. 9(1)=9