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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 373 · 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. 1.111111 × 111111 =
  2. 2.1111 × 1111 =
  3. 3.12345679 × 72 =
  4. 4.1234 × 8 + 4 =
  5. 5.12345679 × 18 =
  6. 6.37 × 12 =
  7. 7.1234567 × 8 + 7 =
  8. 8.12345678 × 8 + 8 =
  9. 9.12345679 × 54 =
  10. 10.12345679 × 36 =
  11. 11.12345678 × 9 + 9 =
  12. 12.123456 × 9 + 7 =
  13. 13.37 × 15 =
  14. 14.1234567 × 9 + 8 =
  15. 15.12345679 × 81 =
  16. 16.111 × 111 =
  17. 17.12 × 8 + 2 =
  18. 18.12345679 × 63 =
  19. 19.37 × 3 =
  20. 20.11111 × 11111 =
  21. 21.123456 × 8 + 6 =
  22. 22.37 × 21 =
  23. 23.11 × 11 =
  24. 24.123456789 × 8 + 9 =
  25. 25.12345679 × 45 =
  26. 26.123 × 9 + 4 =
  27. 27.12345679 × 27 =
  28. 28.12 × 9 + 3 =
  29. 29.37 × 18 =
  30. 30.12345 × 8 + 5 =
  31. 31.11111 × 11111 =
  32. 32.37 × 6 =
  33. 33.37 × 27 =
  34. 34.37 × 24 =
  35. 35.12345 × 9 + 6 =
  36. 36.1234 × 9 + 5 =
  37. 37.12345679 × 54 =
  38. 38.37 × 9 =
  39. 39.123 × 8 + 3 =
  40. 40.12345679 × 9 =

Answer key

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

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