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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 329 · 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. 1.37 × 27 =
  2. 2.12345679 × 27 =
  3. 3.1234567 × 8 + 7 =
  4. 4.123456 × 9 + 7 =
  5. 5.1234 × 8 + 4 =
  6. 6.12 × 8 + 2 =
  7. 7.12345 × 9 + 6 =
  8. 8.11111 × 11111 =
  9. 9.12345679 × 72 =
  10. 10.37 × 9 =
  11. 11.37 × 24 =
  12. 12.37 × 3 =
  13. 13.12345679 × 54 =
  14. 14.111 × 111 =
  15. 15.1111 × 1111 =
  16. 16.123 × 8 + 3 =
  17. 17.37 × 6 =
  18. 18.111111 × 111111 =
  19. 19.12345679 × 9 =
  20. 20.37 × 15 =
  21. 21.12345 × 8 + 5 =
  22. 22.12345678 × 9 + 9 =
  23. 23.11 × 11 =
  24. 24.123456789 × 8 + 9 =
  25. 25.12345679 × 45 =
  26. 26.12345678 × 8 + 8 =
  27. 27.123 × 9 + 4 =
  28. 28.37 × 18 =
  29. 29.12 × 9 + 3 =
  30. 30.11111 × 11111 =
  31. 31.12345679 × 18 =
  32. 32.37 × 21 =
  33. 33.123456 × 8 + 6 =
  34. 34.1234567 × 9 + 8 =
  35. 35.12345679 × 63 =
  36. 36.12345679 × 81 =
  37. 37.12345679 × 36 =
  38. 38.12345679 × 63 =
  39. 39.12345679 × 36 =
  40. 40.123456789 × 8 + 9 =

Answer key

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

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