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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 657 · 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 × 27 =
  2. 2.37 × 3 =
  3. 3.37 × 21 =
  4. 4.12345 × 9 + 6 =
  5. 5.37 × 15 =
  6. 6.11111 × 11111 =
  7. 7.37 × 27 =
  8. 8.37 × 24 =
  9. 9.12345678 × 8 + 8 =
  10. 10.111111 × 111111 =
  11. 11.123456789 × 8 + 9 =
  12. 12.123456 × 9 + 7 =
  13. 13.123 × 8 + 3 =
  14. 14.111 × 111 =
  15. 15.12345679 × 9 =
  16. 16.1111 × 1111 =
  17. 17.12345679 × 36 =
  18. 18.37 × 12 =
  19. 19.12345 × 8 + 5 =
  20. 20.1234 × 9 + 5 =
  21. 21.37 × 18 =
  22. 22.12345679 × 45 =
  23. 23.12345679 × 81 =
  24. 24.12 × 8 + 2 =
  25. 25.1234567 × 8 + 7 =
  26. 26.123 × 9 + 4 =
  27. 27.12 × 9 + 3 =
  28. 28.12345678 × 9 + 9 =
  29. 29.12345679 × 18 =
  30. 30.12345678 × 9 + 9 =
  31. 31.12345679 × 63 =
  32. 32.11 × 11 =
  33. 33.37 × 27 =
  34. 34.12345679 × 54 =
  35. 35.1234 × 8 + 4 =
  36. 36.1234567 × 9 + 8 =
  37. 37.12345679 × 72 =
  38. 38.12345679 × 45 =
  39. 39.37 × 9 =
  40. 40.37 × 6 =

Answer key

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

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