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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 95 · 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. 1.123456 × 9 + 7 =
  2. 2.1234567 × 9 + 8 =
  3. 3.12345678 × 9 + 9 =
  4. 4.1111 × 1111 =
  5. 5.111111 × 111111 =
  6. 6.12345679 × 36 =
  7. 7.37 × 3 =
  8. 8.12 × 9 + 3 =
  9. 9.12 × 8 + 2 =
  10. 10.37 × 6 =
  11. 11.11111 × 11111 =
  12. 12.12345 × 8 + 5 =
  13. 13.1234 × 8 + 4 =
  14. 14.1234567 × 8 + 7 =
  15. 15.37 × 15 =
  16. 16.12345679 × 9 =
  17. 17.12345 × 9 + 6 =
  18. 18.11 × 11 =
  19. 19.37 × 12 =
  20. 20.12345679 × 45 =
  21. 21.12345678 × 8 + 8 =
  22. 22.37 × 24 =
  23. 23.123 × 9 + 4 =
  24. 24.123 × 8 + 3 =
  25. 25.12345679 × 54 =
  26. 26.12345679 × 18 =
  27. 27.37 × 9 =
  28. 28.37 × 27 =
  29. 29.111 × 111 =
  30. 30.12345679 × 72 =
  31. 31.12345679 × 63 =
  32. 32.12345679 × 27 =
  33. 33.12345679 × 81 =
  34. 34.123456 × 8 + 6 =
  35. 35.37 × 15 =
  36. 36.123456789 × 8 + 9 =
  37. 37.37 × 18 =
  38. 38.37 × 21 =
  39. 39.12345679 × 72 =
  40. 40.12345679 × 45 =

Answer key

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

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