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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 832 · 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 × 45 =
  2. 2.1234567 × 9 + 8 =
  3. 3.1111 × 1111 =
  4. 4.12345679 × 63 =
  5. 5.12 × 8 + 2 =
  6. 6.11 × 11 =
  7. 7.111 × 111 =
  8. 8.12345679 × 18 =
  9. 9.11111 × 11111 =
  10. 10.37 × 27 =
  11. 11.123456 × 9 + 7 =
  12. 12.12 × 9 + 3 =
  13. 13.37 × 12 =
  14. 14.1234 × 9 + 5 =
  15. 15.123 × 8 + 3 =
  16. 16.37 × 6 =
  17. 17.12345678 × 9 + 9 =
  18. 18.37 × 24 =
  19. 19.12345679 × 36 =
  20. 20.12345679 × 27 =
  21. 21.12345678 × 8 + 8 =
  22. 22.12345679 × 72 =
  23. 23.37 × 9 =
  24. 24.12345 × 9 + 6 =
  25. 25.12345679 × 54 =
  26. 26.123456 × 8 + 6 =
  27. 27.111111 × 111111 =
  28. 28.37 × 18 =
  29. 29.12345679 × 9 =
  30. 30.1234 × 8 + 4 =
  31. 31.37 × 21 =
  32. 32.12345679 × 81 =
  33. 33.37 × 3 =
  34. 34.12345 × 8 + 5 =
  35. 35.37 × 15 =
  36. 36.1234567 × 8 + 7 =
  37. 37.123456789 × 8 + 9 =
  38. 38.12 × 9 + 3 =
  39. 39.123 × 9 + 4 =
  40. 40.1234567 × 9 + 8 =

Answer key

  1. 555555555
  2. 11111111
  3. 1234321
  4. 777777777
  5. 98
  6. 121
  7. 12321
  8. 222222222
  9. 123454321
  10. 999
  11. 1111111
  12. 111
  13. 444
  14. 11111
  15. 987
  16. 222
  17. 111111111
  18. 888
  19. 444444444
  20. 333333333
  21. 98765432
  22. 888888888
  23. 333
  24. 111111
  25. 666666666
  26. 987654
  27. 12345654321
  28. 666
  29. 111111111
  30. 9876
  31. 777
  32. 999999999
  33. 111
  34. 98765
  35. 555
  36. 9876543
  37. 987654321
  38. 111
  39. 1111
  40. 11111111

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