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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 247 · 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. 1.37 × 9 =
  2. 2.12345679 × 63 =
  3. 3.12345679 × 27 =
  4. 4.11 × 11 =
  5. 5.111 × 111 =
  6. 6.37 × 27 =
  7. 7.12345679 × 9 =
  8. 8.123 × 8 + 3 =
  9. 9.12345 × 9 + 6 =
  10. 10.37 × 12 =
  11. 11.12345679 × 18 =
  12. 12.1111 × 1111 =
  13. 13.123456789 × 8 + 9 =
  14. 14.37 × 6 =
  15. 15.12345679 × 72 =
  16. 16.12 × 8 + 2 =
  17. 17.123456 × 9 + 7 =
  18. 18.123456 × 8 + 6 =
  19. 19.37 × 24 =
  20. 20.12 × 9 + 3 =
  21. 21.37 × 3 =
  22. 22.1234567 × 8 + 7 =
  23. 23.123 × 9 + 4 =
  24. 24.111111 × 111111 =
  25. 25.12345679 × 54 =
  26. 26.12345679 × 45 =
  27. 27.11111 × 11111 =
  28. 28.12345 × 8 + 5 =
  29. 29.12345678 × 8 + 8 =
  30. 30.12345679 × 36 =
  31. 31.1234567 × 9 + 8 =
  32. 32.12345678 × 9 + 9 =
  33. 33.37 × 18 =
  34. 34.37 × 15 =
  35. 35.12345679 × 81 =
  36. 36.37 × 3 =
  37. 37.1234 × 8 + 4 =
  38. 38.123 × 9 + 4 =
  39. 39.37 × 21 =
  40. 40.1234 × 9 + 5 =

Answer key

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

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