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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 383 · 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. 1.37 × 18 =
  2. 2.12345679 × 63 =
  3. 3.123 × 9 + 4 =
  4. 4.12345679 × 18 =
  5. 5.12345679 × 81 =
  6. 6.12345679 × 9 =
  7. 7.12 × 8 + 2 =
  8. 8.37 × 6 =
  9. 9.37 × 24 =
  10. 10.11111 × 11111 =
  11. 11.12345678 × 9 + 9 =
  12. 12.12345 × 9 + 6 =
  13. 13.12345679 × 72 =
  14. 14.1111 × 1111 =
  15. 15.1234567 × 9 + 8 =
  16. 16.123456 × 9 + 7 =
  17. 17.12 × 9 + 3 =
  18. 18.1234567 × 8 + 7 =
  19. 19.123456 × 8 + 6 =
  20. 20.12345679 × 36 =
  21. 21.37 × 15 =
  22. 22.12345679 × 54 =
  23. 23.123456789 × 8 + 9 =
  24. 24.37 × 12 =
  25. 25.123 × 8 + 3 =
  26. 26.37 × 9 =
  27. 27.1234 × 8 + 4 =
  28. 28.111 × 111 =
  29. 29.37 × 3 =
  30. 30.37 × 21 =
  31. 31.11 × 11 =
  32. 32.12345 × 8 + 5 =
  33. 33.12345678 × 8 + 8 =
  34. 34.12345679 × 45 =
  35. 35.37 × 6 =
  36. 36.12345679 × 63 =
  37. 37.37 × 6 =
  38. 38.12345679 × 27 =
  39. 39.1234 × 9 + 5 =
  40. 40.123456 × 8 + 6 =

Answer key

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

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