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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 886 · 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 × 36 =
  2. 2.37 × 24 =
  3. 3.12345679 × 72 =
  4. 4.37 × 6 =
  5. 5.37 × 3 =
  6. 6.12345 × 9 + 6 =
  7. 7.123456 × 9 + 7 =
  8. 8.12345679 × 54 =
  9. 9.12345679 × 45 =
  10. 10.123 × 8 + 3 =
  11. 11.37 × 9 =
  12. 12.12345679 × 9 =
  13. 13.1111 × 1111 =
  14. 14.37 × 15 =
  15. 15.12345679 × 81 =
  16. 16.37 × 27 =
  17. 17.1234 × 8 + 4 =
  18. 18.37 × 21 =
  19. 19.123456 × 8 + 6 =
  20. 20.12345678 × 9 + 9 =
  21. 21.11111 × 11111 =
  22. 22.12345679 × 18 =
  23. 23.37 × 12 =
  24. 24.12345679 × 63 =
  25. 25.1234567 × 8 + 7 =
  26. 26.12345679 × 27 =
  27. 27.11 × 11 =
  28. 28.111111 × 111111 =
  29. 29.1234567 × 9 + 8 =
  30. 30.123 × 9 + 4 =
  31. 31.12 × 9 + 3 =
  32. 32.37 × 21 =
  33. 33.12 × 8 + 2 =
  34. 34.1234567 × 8 + 7 =
  35. 35.37 × 18 =
  36. 36.12345 × 8 + 5 =
  37. 37.123456789 × 8 + 9 =
  38. 38.111 × 111 =
  39. 39.1234 × 9 + 5 =
  40. 40.12345679 × 9 =

Answer key

  1. 444444444
  2. 888
  3. 888888888
  4. 222
  5. 111
  6. 111111
  7. 1111111
  8. 666666666
  9. 555555555
  10. 987
  11. 333
  12. 111111111
  13. 1234321
  14. 555
  15. 999999999
  16. 999
  17. 9876
  18. 777
  19. 987654
  20. 111111111
  21. 123454321
  22. 222222222
  23. 444
  24. 777777777
  25. 9876543
  26. 333333333
  27. 121
  28. 12345654321
  29. 11111111
  30. 1111
  31. 111
  32. 777
  33. 98
  34. 9876543
  35. 666
  36. 98765
  37. 987654321
  38. 12321
  39. 11111
  40. 111111111

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