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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 222 · 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. 1.111 × 111 =
  2. 2.12345679 × 81 =
  3. 3.37 × 6 =
  4. 4.12345679 × 72 =
  5. 5.12 × 8 + 2 =
  6. 6.12345678 × 8 + 8 =
  7. 7.12 × 9 + 3 =
  8. 8.12345 × 9 + 6 =
  9. 9.11111 × 11111 =
  10. 10.12345679 × 45 =
  11. 11.12345679 × 36 =
  12. 12.12345679 × 63 =
  13. 13.12345679 × 27 =
  14. 14.111111 × 111111 =
  15. 15.12345 × 8 + 5 =
  16. 16.12345679 × 9 =
  17. 17.123456 × 8 + 6 =
  18. 18.123 × 9 + 4 =
  19. 19.37 × 27 =
  20. 20.1234 × 9 + 5 =
  21. 21.12345679 × 18 =
  22. 22.1111 × 1111 =
  23. 23.123 × 8 + 3 =
  24. 24.1234567 × 9 + 8 =
  25. 25.123456789 × 8 + 9 =
  26. 26.37 × 12 =
  27. 27.37 × 24 =
  28. 28.1234 × 8 + 4 =
  29. 29.12345678 × 9 + 9 =
  30. 30.37 × 21 =
  31. 31.37 × 9 =
  32. 32.12345679 × 54 =
  33. 33.37 × 9 =
  34. 34.37 × 3 =
  35. 35.11 × 11 =
  36. 36.37 × 18 =
  37. 37.111 × 111 =
  38. 38.37 × 15 =
  39. 39.12 × 8 + 2 =
  40. 40.1234 × 8 + 4 =

Answer key

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

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