Ya Know Math?

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Across
  1. 8. 6 ÷ 2 = 3
  2. 10. 2 × (3+5) = 16
  3. 11. 5 = 2+3
  4. 13. 2 ⋅ 3 = 6
  5. 14. \frac{6}{2}=3
  6. 16. 2 ^ 3 = 8
  7. 19. 6 / 2 = 3
  8. 20. 10ppb × 30 = 3×10-7 it exists but doesn't exist here
  9. 21. 1 + 1 = 2
  10. 22. 7 mod 2 = 1
  11. 23. for n=3, n√8 = 2 exists but doesn't exist here
  12. 24. 4√16 = ±2 it exists but doesn't exist here
  13. 26. 10‰ × 30 = 0.3
  14. 28. [(1+2)×(1+5)] = 18
  15. 29. 4 < 5
  16. 30. 5 ≠ 4
Down
  1. 1. 3√8 = 2 it exists but doesn't exist here
  2. 2. 4 ≤ 5, x ≤ y
  3. 3. 5 > 4
  4. 4. 2 − 1 = 1
  5. 5. 3 ∓ 5 = -2 or 8
  6. 6. 10% × 30 = 3
  7. 7. 2 × 3 = 6
  8. 9. 5 ≥ 4, x ≥ y
  9. 10. 10ppt × 30 = 3×10-10 it exists but doesn't exist here
  10. 12. 23 = 8 it exists but doesn't exist here
  11. 15. 2 * 3 = 6
  12. 17. sin(0.01) ≈ 0.01
  13. 18. 2.56 = 2+56/100
  14. 19. √9 = ±3
  15. 25. 3 ± 5 = 8 or -2
  16. 27. 10ppm × 30 = 0.0003