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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 367 · 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 × 54 =
  2. 2.12345679 × 45 =
  3. 3.12345679 × 27 =
  4. 4.11 × 11 =
  5. 5.37 × 12 =
  6. 6.123456 × 8 + 6 =
  7. 7.11111 × 11111 =
  8. 8.1234 × 9 + 5 =
  9. 9.123 × 9 + 4 =
  10. 10.12 × 9 + 3 =
  11. 11.12345678 × 8 + 8 =
  12. 12.12 × 8 + 2 =
  13. 13.37 × 15 =
  14. 14.12345679 × 72 =
  15. 15.111 × 111 =
  16. 16.111111 × 111111 =
  17. 17.37 × 9 =
  18. 18.1234567 × 8 + 7 =
  19. 19.1234 × 8 + 4 =
  20. 20.12345679 × 18 =
  21. 21.123456789 × 8 + 9 =
  22. 22.37 × 3 =
  23. 23.37 × 24 =
  24. 24.12345679 × 9 =
  25. 25.37 × 6 =
  26. 26.12345679 × 36 =
  27. 27.12345679 × 81 =
  28. 28.37 × 21 =
  29. 29.123 × 8 + 3 =
  30. 30.123456 × 9 + 7 =
  31. 31.1111 × 1111 =
  32. 32.37 × 18 =
  33. 33.37 × 12 =
  34. 34.12345 × 8 + 5 =
  35. 35.37 × 24 =
  36. 36.37 × 27 =
  37. 37.11111 × 11111 =
  38. 38.12345678 × 9 + 9 =
  39. 39.12345679 × 63 =
  40. 40.12 × 8 + 2 =

Answer key

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

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