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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 140 · 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. 1.12 × 8 + 2 =
  2. 2.1234 × 9 + 5 =
  3. 3.123 × 8 + 3 =
  4. 4.1234567 × 8 + 7 =
  5. 5.37 × 27 =
  6. 6.1234 × 8 + 4 =
  7. 7.12345679 × 63 =
  8. 8.111111 × 111111 =
  9. 9.37 × 3 =
  10. 10.111 × 111 =
  11. 11.123456 × 8 + 6 =
  12. 12.12345679 × 18 =
  13. 13.11111 × 11111 =
  14. 14.12345679 × 81 =
  15. 15.12345679 × 45 =
  16. 16.1234567 × 9 + 8 =
  17. 17.12345679 × 36 =
  18. 18.37 × 12 =
  19. 19.12345678 × 8 + 8 =
  20. 20.12345679 × 27 =
  21. 21.123 × 9 + 4 =
  22. 22.12345679 × 9 =
  23. 23.12345 × 9 + 6 =
  24. 24.1111 × 1111 =
  25. 25.12345678 × 9 + 9 =
  26. 26.123456789 × 8 + 9 =
  27. 27.123456 × 9 + 7 =
  28. 28.37 × 9 =
  29. 29.12 × 9 + 3 =
  30. 30.12345679 × 54 =
  31. 31.12345678 × 9 + 9 =
  32. 32.37 × 24 =
  33. 33.37 × 6 =
  34. 34.37 × 21 =
  35. 35.12345679 × 72 =
  36. 36.12345 × 8 + 5 =
  37. 37.37 × 15 =
  38. 38.12345678 × 9 + 9 =
  39. 39.37 × 18 =
  40. 40.12345679 × 72 =

Answer key

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

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