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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 881 · 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. 1.1234 × 9 + 5 =
  2. 2.12345679 × 27 =
  3. 3.11 × 11 =
  4. 4.12345678 × 8 + 8 =
  5. 5.123 × 8 + 3 =
  6. 6.37 × 24 =
  7. 7.12345679 × 18 =
  8. 8.12 × 9 + 3 =
  9. 9.12345679 × 36 =
  10. 10.123456789 × 8 + 9 =
  11. 11.37 × 3 =
  12. 12.12345679 × 45 =
  13. 13.111111 × 111111 =
  14. 14.1234 × 8 + 4 =
  15. 15.37 × 9 =
  16. 16.123 × 9 + 4 =
  17. 17.1234567 × 8 + 7 =
  18. 18.37 × 27 =
  19. 19.123456 × 8 + 6 =
  20. 20.1234567 × 9 + 8 =
  21. 21.12345679 × 81 =
  22. 22.1111 × 1111 =
  23. 23.12345 × 9 + 6 =
  24. 24.111 × 111 =
  25. 25.37 × 12 =
  26. 26.12345679 × 63 =
  27. 27.12345 × 8 + 5 =
  28. 28.12345679 × 72 =
  29. 29.37 × 18 =
  30. 30.123456 × 9 + 7 =
  31. 31.37 × 21 =
  32. 32.37 × 15 =
  33. 33.123 × 9 + 4 =
  34. 34.12 × 8 + 2 =
  35. 35.37 × 6 =
  36. 36.11111 × 11111 =
  37. 37.1234 × 9 + 5 =
  38. 38.12345679 × 9 =
  39. 39.123456 × 8 + 6 =
  40. 40.12345678 × 9 + 9 =

Answer key

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

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