Do I know Math?

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Across
  1. 5. Start with 6, multiply by 8
  2. 8. (300 ÷ 4)
  3. 9. Start with 18, multiply by 5
  4. 12. Start with 20, multiply by 3, then subtract 10
  5. 14. Start with 25, multiply by 4
  6. 17. (45 × 2)
  7. 18. Start with 16, multiply by 5
  8. 19. (43 × 2)
  9. 20. (50 + 23)
  10. 23. (100 − 22)
  11. 26. (90 − 23)
  12. 27. (8 × 8)
  13. 30. (12 × 11)
Down
  1. 1. (6 × 8)
  2. 2. (6 × 6)
  3. 3. (21 × 4)
  4. 4. (7 × 11)
  5. 6. (12 × 9)
  6. 7. (29 × 2)
  7. 10. (13 × 7)
  8. 11. Start with 7, multiply by 8
  9. 13. Start with 15, multiply by 4
  10. 15. (9 × 9)
  11. 16. Start with 12, multiply by 3, then subtract 6
  12. 21. (49 × 2)
  13. 22. (9 × 6)
  14. 23. Start with 9, multiply by 8
  15. 24. (23 × 3)
  16. 25. Start with 10, multiply by 7
  17. 28. (13 × 4)
  18. 29. (11 × 6)