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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 847 · 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 × 15 =
  2. 2.123 × 8 + 3 =
  3. 3.37 × 24 =
  4. 4.12345679 × 45 =
  5. 5.37 × 27 =
  6. 6.37 × 21 =
  7. 7.11 × 11 =
  8. 8.37 × 6 =
  9. 9.37 × 9 =
  10. 10.12345679 × 72 =
  11. 11.12345679 × 27 =
  12. 12.37 × 3 =
  13. 13.111111 × 111111 =
  14. 14.123456 × 9 + 7 =
  15. 15.12345679 × 18 =
  16. 16.37 × 12 =
  17. 17.12345678 × 9 + 9 =
  18. 18.12 × 9 + 3 =
  19. 19.123 × 9 + 4 =
  20. 20.123456 × 8 + 6 =
  21. 21.1234567 × 8 + 7 =
  22. 22.12345678 × 8 + 8 =
  23. 23.12345679 × 36 =
  24. 24.1234 × 8 + 4 =
  25. 25.111 × 111 =
  26. 26.123456789 × 8 + 9 =
  27. 27.1111 × 1111 =
  28. 28.12345679 × 81 =
  29. 29.37 × 18 =
  30. 30.12345679 × 9 =
  31. 31.12345 × 9 + 6 =
  32. 32.12345679 × 54 =
  33. 33.11111 × 11111 =
  34. 34.12345 × 8 + 5 =
  35. 35.12345679 × 18 =
  36. 36.12345679 × 72 =
  37. 37.111111 × 111111 =
  38. 38.12 × 8 + 2 =
  39. 39.123456 × 9 + 7 =
  40. 40.1234567 × 9 + 8 =

Answer key

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

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