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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 836 · 40 questions
TalentJR

The trick (Spot the pattern): 37 × 3 = 111, so 37 × (3 × k) is k written three times. 12345679 × 9 = 111111111, so 12345679 × (9 × k) is k written nine times. 1 × 8 + 1 = 9, 12 × 8 + 2 = 98, 123 × 8 + 3 = 987 …; and 11 × 11 = 121, 111 × 111 = 12321.

NameDateTime takenScore ___ / 40
  1. 1.12345679 × 27 =
  2. 2.1234 × 8 + 4 =
  3. 3.12 × 9 + 3 =
  4. 4.12345679 × 72 =
  5. 5.12345679 × 36 =
  6. 6.12345679 × 81 =
  7. 7.12 × 8 + 2 =
  8. 8.1234 × 9 + 5 =
  9. 9.1111 × 1111 =
  10. 10.37 × 9 =
  11. 11.111 × 111 =
  12. 12.12345679 × 9 =
  13. 13.37 × 3 =
  14. 14.37 × 27 =
  15. 15.11 × 11 =
  16. 16.37 × 12 =
  17. 17.12345 × 8 + 5 =
  18. 18.12345679 × 45 =
  19. 19.123 × 8 + 3 =
  20. 20.1234567 × 9 + 8 =
  21. 21.123456789 × 8 + 9 =
  22. 22.12345679 × 54 =
  23. 23.111111 × 111111 =
  24. 24.123456 × 8 + 6 =
  25. 25.37 × 18 =
  26. 26.12345678 × 9 + 9 =
  27. 27.1234567 × 8 + 7 =
  28. 28.123 × 9 + 4 =
  29. 29.37 × 15 =
  30. 30.11111 × 11111 =
  31. 31.12345 × 9 + 6 =
  32. 32.12345679 × 18 =
  33. 33.123456 × 9 + 7 =
  34. 34.1234567 × 9 + 8 =
  35. 35.37 × 24 =
  36. 36.37 × 6 =
  37. 37.12 × 9 + 3 =
  38. 38.123456 × 8 + 6 =
  39. 39.12345679 × 27 =
  40. 40.37 × 3 =

Answer key

  1. 333333333
  2. 9876
  3. 111
  4. 888888888
  5. 444444444
  6. 999999999
  7. 98
  8. 11111
  9. 1234321
  10. 333
  11. 12321
  12. 111111111
  13. 111
  14. 999
  15. 121
  16. 444
  17. 98765
  18. 555555555
  19. 987
  20. 11111111
  21. 987654321
  22. 666666666
  23. 12345654321
  24. 987654
  25. 666
  26. 111111111
  27. 9876543
  28. 1111
  29. 555
  30. 123454321
  31. 111111
  32. 222222222
  33. 1111111
  34. 11111111
  35. 888
  36. 222
  37. 111
  38. 987654
  39. 333333333
  40. 111

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