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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 511 · 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 × 72 =
  2. 2.37 × 9 =
  3. 3.1234 × 9 + 5 =
  4. 4.111 × 111 =
  5. 5.111111 × 111111 =
  6. 6.1234567 × 9 + 8 =
  7. 7.11 × 11 =
  8. 8.12345679 × 27 =
  9. 9.11111 × 11111 =
  10. 10.12345679 × 54 =
  11. 11.123456 × 9 + 7 =
  12. 12.37 × 3 =
  13. 13.37 × 27 =
  14. 14.12345679 × 9 =
  15. 15.123 × 8 + 3 =
  16. 16.12345679 × 18 =
  17. 17.123456 × 8 + 6 =
  18. 18.37 × 12 =
  19. 19.12 × 9 + 3 =
  20. 20.37 × 18 =
  21. 21.12345679 × 81 =
  22. 22.37 × 21 =
  23. 23.123456789 × 8 + 9 =
  24. 24.37 × 24 =
  25. 25.1111 × 1111 =
  26. 26.12345678 × 8 + 8 =
  27. 27.12345 × 8 + 5 =
  28. 28.12345679 × 36 =
  29. 29.37 × 6 =
  30. 30.1234 × 8 + 4 =
  31. 31.12 × 8 + 2 =
  32. 32.12345679 × 63 =
  33. 33.12345679 × 45 =
  34. 34.123 × 9 + 4 =
  35. 35.1234567 × 8 + 7 =
  36. 36.37 × 15 =
  37. 37.12345678 × 9 + 9 =
  38. 38.12345 × 9 + 6 =
  39. 39.12345679 × 45 =
  40. 40.12345679 × 45 =

Answer key

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

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