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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 958 · 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 × 24 =
  2. 2.11111 × 11111 =
  3. 3.12345679 × 54 =
  4. 4.12345 × 8 + 5 =
  5. 5.12 × 8 + 2 =
  6. 6.37 × 9 =
  7. 7.12345679 × 18 =
  8. 8.12345679 × 27 =
  9. 9.111 × 111 =
  10. 10.12345679 × 45 =
  11. 11.12345679 × 9 =
  12. 12.12345679 × 81 =
  13. 13.12345 × 9 + 6 =
  14. 14.1111 × 1111 =
  15. 15.1234567 × 9 + 8 =
  16. 16.37 × 6 =
  17. 17.123456 × 9 + 7 =
  18. 18.37 × 18 =
  19. 19.11 × 11 =
  20. 20.12 × 9 + 3 =
  21. 21.111111 × 111111 =
  22. 22.12345679 × 36 =
  23. 23.12345678 × 9 + 9 =
  24. 24.37 × 15 =
  25. 25.123 × 8 + 3 =
  26. 26.37 × 21 =
  27. 27.123 × 9 + 4 =
  28. 28.37 × 12 =
  29. 29.37 × 27 =
  30. 30.12345678 × 8 + 8 =
  31. 31.123456789 × 8 + 9 =
  32. 32.1234567 × 8 + 7 =
  33. 33.1234 × 9 + 5 =
  34. 34.12345679 × 72 =
  35. 35.12345679 × 63 =
  36. 36.37 × 3 =
  37. 37.1234567 × 9 + 8 =
  38. 38.123456 × 8 + 6 =
  39. 39.1234 × 8 + 4 =
  40. 40.12345678 × 8 + 8 =

Answer key

  1. 888
  2. 123454321
  3. 666666666
  4. 98765
  5. 98
  6. 333
  7. 222222222
  8. 333333333
  9. 12321
  10. 555555555
  11. 111111111
  12. 999999999
  13. 111111
  14. 1234321
  15. 11111111
  16. 222
  17. 1111111
  18. 666
  19. 121
  20. 111
  21. 12345654321
  22. 444444444
  23. 111111111
  24. 555
  25. 987
  26. 777
  27. 1111
  28. 444
  29. 999
  30. 98765432
  31. 987654321
  32. 9876543
  33. 11111
  34. 888888888
  35. 777777777
  36. 111
  37. 11111111
  38. 987654
  39. 9876
  40. 98765432

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