Do I know Math?

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