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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 824 · 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. 1.12345679 × 27 =
  2. 2.12345678 × 8 + 8 =
  3. 3.12345679 × 63 =
  4. 4.111111 × 111111 =
  5. 5.11 × 11 =
  6. 6.37 × 15 =
  7. 7.12345679 × 45 =
  8. 8.12345679 × 18 =
  9. 9.37 × 6 =
  10. 10.123456 × 8 + 6 =
  11. 11.12345679 × 9 =
  12. 12.123 × 9 + 4 =
  13. 13.12 × 8 + 2 =
  14. 14.12345679 × 54 =
  15. 15.12345679 × 72 =
  16. 16.37 × 18 =
  17. 17.12345678 × 9 + 9 =
  18. 18.37 × 3 =
  19. 19.1234567 × 9 + 8 =
  20. 20.37 × 9 =
  21. 21.37 × 24 =
  22. 22.12345679 × 81 =
  23. 23.11111 × 11111 =
  24. 24.12345678 × 9 + 9 =
  25. 25.123 × 8 + 3 =
  26. 26.1234 × 9 + 5 =
  27. 27.37 × 21 =
  28. 28.12 × 9 + 3 =
  29. 29.123456 × 9 + 7 =
  30. 30.123456789 × 8 + 9 =
  31. 31.1234567 × 8 + 7 =
  32. 32.1234 × 8 + 4 =
  33. 33.12345679 × 45 =
  34. 34.12345 × 9 + 6 =
  35. 35.37 × 6 =
  36. 36.11 × 11 =
  37. 37.12345 × 8 + 5 =
  38. 38.37 × 27 =
  39. 39.111 × 111 =
  40. 40.12345679 × 36 =

Answer key

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

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