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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 359 · 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 × 81 =
  2. 2.11111 × 11111 =
  3. 3.37 × 3 =
  4. 4.12 × 8 + 2 =
  5. 5.37 × 21 =
  6. 6.12345 × 8 + 5 =
  7. 7.12345678 × 9 + 9 =
  8. 8.37 × 6 =
  9. 9.12345 × 9 + 6 =
  10. 10.111111 × 111111 =
  11. 11.11 × 11 =
  12. 12.1234567 × 9 + 8 =
  13. 13.37 × 18 =
  14. 14.12345679 × 72 =
  15. 15.12345679 × 9 =
  16. 16.37 × 27 =
  17. 17.111 × 111 =
  18. 18.37 × 15 =
  19. 19.123 × 9 + 4 =
  20. 20.123456 × 9 + 7 =
  21. 21.12345679 × 18 =
  22. 22.123 × 8 + 3 =
  23. 23.1234 × 9 + 5 =
  24. 24.12345679 × 63 =
  25. 25.123456 × 8 + 6 =
  26. 26.37 × 12 =
  27. 27.1111 × 1111 =
  28. 28.12 × 9 + 3 =
  29. 29.12345679 × 54 =
  30. 30.37 × 24 =
  31. 31.12345679 × 45 =
  32. 32.37 × 9 =
  33. 33.12345678 × 8 + 8 =
  34. 34.1234 × 8 + 4 =
  35. 35.12345679 × 27 =
  36. 36.1234567 × 8 + 7 =
  37. 37.123456789 × 8 + 9 =
  38. 38.12 × 9 + 3 =
  39. 39.111 × 111 =
  40. 40.111111 × 111111 =

Answer key

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

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