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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 417 · 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. 1.12345678 × 8 + 8 =
  2. 2.1234567 × 9 + 8 =
  3. 3.123456789 × 8 + 9 =
  4. 4.1234 × 9 + 5 =
  5. 5.12 × 8 + 2 =
  6. 6.37 × 21 =
  7. 7.37 × 3 =
  8. 8.11111 × 11111 =
  9. 9.12345679 × 54 =
  10. 10.12 × 9 + 3 =
  11. 11.12345 × 9 + 6 =
  12. 12.123 × 8 + 3 =
  13. 13.1111 × 1111 =
  14. 14.12345678 × 9 + 9 =
  15. 15.12345679 × 45 =
  16. 16.12345679 × 36 =
  17. 17.37 × 24 =
  18. 18.37 × 27 =
  19. 19.37 × 15 =
  20. 20.12345679 × 81 =
  21. 21.12345679 × 72 =
  22. 22.123 × 9 + 4 =
  23. 23.12345679 × 27 =
  24. 24.11 × 11 =
  25. 25.111 × 111 =
  26. 26.37 × 12 =
  27. 27.12345679 × 18 =
  28. 28.12345679 × 63 =
  29. 29.37 × 6 =
  30. 30.111111 × 111111 =
  31. 31.12345 × 8 + 5 =
  32. 32.12345679 × 9 =
  33. 33.1234 × 8 + 4 =
  34. 34.12345679 × 27 =
  35. 35.37 × 18 =
  36. 36.12345679 × 54 =
  37. 37.123456 × 9 + 7 =
  38. 38.37 × 9 =
  39. 39.37 × 9 =
  40. 40.37 × 21 =

Answer key

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

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