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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 854 · 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. 2.37 × 18 =
  3. 3.37 × 6 =
  4. 4.37 × 27 =
  5. 5.11111 × 11111 =
  6. 6.12345679 × 36 =
  7. 7.37 × 24 =
  8. 8.123456789 × 8 + 9 =
  9. 9.1234567 × 9 + 8 =
  10. 10.12345679 × 45 =
  11. 11.11 × 11 =
  12. 12.111 × 111 =
  13. 13.123 × 9 + 4 =
  14. 14.12345679 × 81 =
  15. 15.12345678 × 8 + 8 =
  16. 16.111111 × 111111 =
  17. 17.1234567 × 8 + 7 =
  18. 18.37 × 12 =
  19. 19.1111 × 1111 =
  20. 20.12345679 × 18 =
  21. 21.123456 × 9 + 7 =
  22. 22.12345679 × 63 =
  23. 23.12345 × 8 + 5 =
  24. 24.12345678 × 9 + 9 =
  25. 25.37 × 15 =
  26. 26.12345679 × 54 =
  27. 27.37 × 3 =
  28. 28.12345679 × 72 =
  29. 29.123456 × 8 + 6 =
  30. 30.37 × 21 =
  31. 31.12 × 8 + 2 =
  32. 32.37 × 9 =
  33. 33.37 × 15 =
  34. 34.123 × 8 + 3 =
  35. 35.1111 × 1111 =
  36. 36.12345 × 9 + 6 =
  37. 37.1234 × 9 + 5 =
  38. 38.12 × 9 + 3 =
  39. 39.37 × 9 =
  40. 40.1234567 × 9 + 8 =

Answer key

  1. 333333333
  2. 666
  3. 222
  4. 999
  5. 123454321
  6. 444444444
  7. 888
  8. 987654321
  9. 11111111
  10. 555555555
  11. 121
  12. 12321
  13. 1111
  14. 999999999
  15. 98765432
  16. 12345654321
  17. 9876543
  18. 444
  19. 1234321
  20. 222222222
  21. 1111111
  22. 777777777
  23. 98765
  24. 111111111
  25. 555
  26. 666666666
  27. 111
  28. 888888888
  29. 987654
  30. 777
  31. 98
  32. 333
  33. 555
  34. 987
  35. 1234321
  36. 111111
  37. 11111
  38. 111
  39. 333
  40. 11111111

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