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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 39 · 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 × 27 =
  2. 2.1111 × 1111 =
  3. 3.1234 × 9 + 5 =
  4. 4.37 × 18 =
  5. 5.12 × 9 + 3 =
  6. 6.11 × 11 =
  7. 7.123456 × 8 + 6 =
  8. 8.11111 × 11111 =
  9. 9.1234567 × 8 + 7 =
  10. 10.111111 × 111111 =
  11. 11.1234567 × 9 + 8 =
  12. 12.37 × 24 =
  13. 13.12345678 × 9 + 9 =
  14. 14.111 × 111 =
  15. 15.37 × 21 =
  16. 16.12345 × 9 + 6 =
  17. 17.123 × 9 + 4 =
  18. 18.12345679 × 36 =
  19. 19.1234 × 8 + 4 =
  20. 20.12345 × 8 + 5 =
  21. 21.37 × 12 =
  22. 22.12345679 × 9 =
  23. 23.123456 × 9 + 7 =
  24. 24.37 × 3 =
  25. 25.37 × 15 =
  26. 26.12345679 × 54 =
  27. 27.12345679 × 72 =
  28. 28.123456789 × 8 + 9 =
  29. 29.12345679 × 63 =
  30. 30.12345679 × 45 =
  31. 31.123456789 × 8 + 9 =
  32. 32.123 × 8 + 3 =
  33. 33.37 × 6 =
  34. 34.12345678 × 8 + 8 =
  35. 35.12345679 × 18 =
  36. 36.12345679 × 81 =
  37. 37.12 × 8 + 2 =
  38. 38.123456789 × 8 + 9 =
  39. 39.1111 × 1111 =
  40. 40.37 × 3 =

Answer key

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

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