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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 269 · 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. 1.123 × 9 + 4 =
  2. 2.12345 × 9 + 6 =
  3. 3.11111 × 11111 =
  4. 4.12 × 9 + 3 =
  5. 5.123456 × 9 + 7 =
  6. 6.1234 × 9 + 5 =
  7. 7.37 × 15 =
  8. 8.1234 × 8 + 4 =
  9. 9.37 × 24 =
  10. 10.12345679 × 72 =
  11. 11.12345 × 8 + 5 =
  12. 12.37 × 6 =
  13. 13.123 × 8 + 3 =
  14. 14.12345678 × 9 + 9 =
  15. 15.12345678 × 8 + 8 =
  16. 16.111111 × 111111 =
  17. 17.12345679 × 81 =
  18. 18.37 × 18 =
  19. 19.12345679 × 36 =
  20. 20.1234567 × 9 + 8 =
  21. 21.11 × 11 =
  22. 22.37 × 21 =
  23. 23.12345679 × 27 =
  24. 24.123456789 × 8 + 9 =
  25. 25.12345679 × 63 =
  26. 26.37 × 12 =
  27. 27.1234567 × 8 + 7 =
  28. 28.12345679 × 45 =
  29. 29.1111 × 1111 =
  30. 30.111 × 111 =
  31. 31.123456 × 8 + 6 =
  32. 32.12345679 × 9 =
  33. 33.12345679 × 54 =
  34. 34.37 × 27 =
  35. 35.12345679 × 72 =
  36. 36.12 × 8 + 2 =
  37. 37.12345679 × 18 =
  38. 38.37 × 12 =
  39. 39.37 × 9 =
  40. 40.11111 × 11111 =

Answer key

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

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