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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 104 · 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 × 9 + 3 =
  2. 2.12345679 × 9 =
  3. 3.12345679 × 81 =
  4. 4.37 × 21 =
  5. 5.1234 × 8 + 4 =
  6. 6.12345679 × 18 =
  7. 7.123 × 9 + 4 =
  8. 8.11111 × 11111 =
  9. 9.37 × 3 =
  10. 10.37 × 6 =
  11. 11.12345678 × 8 + 8 =
  12. 12.37 × 12 =
  13. 13.11 × 11 =
  14. 14.12 × 8 + 2 =
  15. 15.37 × 9 =
  16. 16.1111 × 1111 =
  17. 17.12345679 × 27 =
  18. 18.111 × 111 =
  19. 19.37 × 27 =
  20. 20.12345 × 9 + 6 =
  21. 21.12345679 × 36 =
  22. 22.12345679 × 63 =
  23. 23.12345679 × 45 =
  24. 24.123 × 8 + 3 =
  25. 25.12345678 × 9 + 9 =
  26. 26.37 × 24 =
  27. 27.1234 × 9 + 5 =
  28. 28.123456 × 8 + 6 =
  29. 29.123456 × 9 + 7 =
  30. 30.37 × 18 =
  31. 31.12345679 × 54 =
  32. 32.111111 × 111111 =
  33. 33.1234567 × 9 + 8 =
  34. 34.12345679 × 72 =
  35. 35.1234567 × 8 + 7 =
  36. 36.37 × 21 =
  37. 37.12345 × 8 + 5 =
  38. 38.123456789 × 8 + 9 =
  39. 39.37 × 15 =
  40. 40.12345679 × 81 =

Answer key

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

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