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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 589 · 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 × 21 =
  2. 2.12345 × 8 + 5 =
  3. 3.12345 × 9 + 6 =
  4. 4.37 × 3 =
  5. 5.123456789 × 8 + 9 =
  6. 6.1234 × 9 + 5 =
  7. 7.12345679 × 9 =
  8. 8.1234567 × 8 + 7 =
  9. 9.123 × 9 + 4 =
  10. 10.37 × 27 =
  11. 11.37 × 9 =
  12. 12.1111 × 1111 =
  13. 13.11111 × 11111 =
  14. 14.37 × 12 =
  15. 15.12345679 × 54 =
  16. 16.37 × 15 =
  17. 17.1234 × 8 + 4 =
  18. 18.12 × 9 + 3 =
  19. 19.12345678 × 9 + 9 =
  20. 20.12345679 × 36 =
  21. 21.12345679 × 72 =
  22. 22.12345679 × 63 =
  23. 23.12345679 × 18 =
  24. 24.1234567 × 9 + 8 =
  25. 25.111111 × 111111 =
  26. 26.12345678 × 8 + 8 =
  27. 27.123 × 8 + 3 =
  28. 28.12 × 8 + 2 =
  29. 29.11 × 11 =
  30. 30.123456 × 8 + 6 =
  31. 31.12345679 × 27 =
  32. 32.37 × 18 =
  33. 33.111 × 111 =
  34. 34.37 × 3 =
  35. 35.37 × 6 =
  36. 36.37 × 24 =
  37. 37.12345679 × 45 =
  38. 38.12345679 × 81 =
  39. 39.12345679 × 72 =
  40. 40.12 × 8 + 2 =

Answer key

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

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