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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 563 · 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 × 18 =
  3. 3.37 × 6 =
  4. 4.12345679 × 9 =
  5. 5.123456 × 9 + 7 =
  6. 6.123 × 9 + 4 =
  7. 7.12 × 9 + 3 =
  8. 8.37 × 12 =
  9. 9.37 × 27 =
  10. 10.12345679 × 36 =
  11. 11.1234567 × 9 + 8 =
  12. 12.12345 × 8 + 5 =
  13. 13.12345679 × 45 =
  14. 14.12345679 × 27 =
  15. 15.11111 × 11111 =
  16. 16.12345678 × 9 + 9 =
  17. 17.11 × 11 =
  18. 18.111 × 111 =
  19. 19.12345 × 9 + 6 =
  20. 20.1234567 × 8 + 7 =
  21. 21.12345679 × 81 =
  22. 22.123456789 × 8 + 9 =
  23. 23.1111 × 1111 =
  24. 24.37 × 24 =
  25. 25.37 × 21 =
  26. 26.12345679 × 63 =
  27. 27.123 × 8 + 3 =
  28. 28.12345678 × 8 + 8 =
  29. 29.1234 × 8 + 4 =
  30. 30.12 × 8 + 2 =
  31. 31.37 × 3 =
  32. 32.12345679 × 54 =
  33. 33.111111 × 111111 =
  34. 34.123456 × 8 + 6 =
  35. 35.37 × 9 =
  36. 36.123 × 8 + 3 =
  37. 37.12345 × 9 + 6 =
  38. 38.1234 × 8 + 4 =
  39. 39.1234 × 9 + 5 =
  40. 40.12345679 × 72 =

Answer key

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

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