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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 484 · 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. 2.111 × 111 =
  3. 3.111111 × 111111 =
  4. 4.123456 × 9 + 7 =
  5. 5.12345679 × 27 =
  6. 6.37 × 21 =
  7. 7.1234 × 8 + 4 =
  8. 8.1234567 × 9 + 8 =
  9. 9.11111 × 11111 =
  10. 10.123 × 8 + 3 =
  11. 11.1234 × 9 + 5 =
  12. 12.12345679 × 36 =
  13. 13.12345679 × 63 =
  14. 14.1234567 × 8 + 7 =
  15. 15.123 × 9 + 4 =
  16. 16.12345 × 9 + 6 =
  17. 17.12345678 × 8 + 8 =
  18. 18.12345679 × 18 =
  19. 19.37 × 9 =
  20. 20.12345679 × 81 =
  21. 21.11 × 11 =
  22. 22.12 × 9 + 3 =
  23. 23.1111 × 1111 =
  24. 24.37 × 15 =
  25. 25.12345 × 8 + 5 =
  26. 26.123456789 × 8 + 9 =
  27. 27.1234567 × 9 + 8 =
  28. 28.37 × 27 =
  29. 29.37 × 24 =
  30. 30.12345679 × 54 =
  31. 31.37 × 12 =
  32. 32.37 × 6 =
  33. 33.12 × 8 + 2 =
  34. 34.37 × 3 =
  35. 35.12345679 × 45 =
  36. 36.12345679 × 9 =
  37. 37.11111 × 11111 =
  38. 38.12345 × 8 + 5 =
  39. 39.12345679 × 45 =
  40. 40.11111 × 11111 =

Answer key

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

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