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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 330 · 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. 2.123456789 × 8 + 9 =
  3. 3.11111 × 11111 =
  4. 4.37 × 15 =
  5. 5.12345679 × 18 =
  6. 6.37 × 3 =
  7. 7.12 × 8 + 2 =
  8. 8.37 × 18 =
  9. 9.12 × 9 + 3 =
  10. 10.123456 × 8 + 6 =
  11. 11.37 × 9 =
  12. 12.37 × 6 =
  13. 13.37 × 27 =
  14. 14.12345679 × 27 =
  15. 15.11 × 11 =
  16. 16.12345678 × 9 + 9 =
  17. 17.12345679 × 63 =
  18. 18.111111 × 111111 =
  19. 19.111 × 111 =
  20. 20.1111 × 1111 =
  21. 21.37 × 21 =
  22. 22.12345679 × 54 =
  23. 23.1234 × 8 + 4 =
  24. 24.37 × 24 =
  25. 25.12345678 × 8 + 8 =
  26. 26.1234 × 9 + 5 =
  27. 27.12345679 × 9 =
  28. 28.123456 × 9 + 7 =
  29. 29.12345 × 9 + 6 =
  30. 30.12345679 × 36 =
  31. 31.1234567 × 9 + 8 =
  32. 32.12345679 × 9 =
  33. 33.37 × 12 =
  34. 34.12345 × 8 + 5 =
  35. 35.123 × 8 + 3 =
  36. 36.123 × 9 + 4 =
  37. 37.12345679 × 18 =
  38. 38.12345679 × 45 =
  39. 39.12345679 × 45 =
  40. 40.1234567 × 8 + 7 =

Answer key

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

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