ONE PLUS ONE IS?

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Across
  1. 3. (88-11)+(88:11)
  2. 4. 35-6-9-8
  3. 7. (63:9)+(12x4)-(3x5)+(99:11)
  4. 8. (41-18)+(20x2)
  5. 11. (42+23):(55:11)
  6. 12. (15:3)x(60:15)
  7. 14. (81:9)+(4x5)
  8. 15. (7x6)+(6x3)+(15x2)-(20x2)
Down
  1. 1. (45x2)-(52:2)+(4x4)+(7x2)
  2. 2. (77:7)+(11x2)-(7x2)
  3. 5. 13x(2x3)-(3x2)
  4. 6. (2x55)-(2x5)
  5. 9. (56:8)+(6+3+2)-(9:2)
  6. 10. (16:4)+(4x9):(2x3)
  7. 13. 66+3-5-20+7-5+12-5+3