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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 678 · 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 × 9 =
  2. 2.1234 × 8 + 4 =
  3. 3.12345679 × 36 =
  4. 4.37 × 6 =
  5. 5.111111 × 111111 =
  6. 6.12345 × 9 + 6 =
  7. 7.123 × 8 + 3 =
  8. 8.123456 × 8 + 6 =
  9. 9.111 × 111 =
  10. 10.12345679 × 63 =
  11. 11.12 × 8 + 2 =
  12. 12.37 × 21 =
  13. 13.123 × 9 + 4 =
  14. 14.37 × 12 =
  15. 15.12345679 × 81 =
  16. 16.12345679 × 54 =
  17. 17.12345 × 8 + 5 =
  18. 18.12345679 × 18 =
  19. 19.1234567 × 9 + 8 =
  20. 20.12345678 × 8 + 8 =
  21. 21.123456 × 9 + 7 =
  22. 22.12345678 × 9 + 9 =
  23. 23.12 × 9 + 3 =
  24. 24.37 × 9 =
  25. 25.1234 × 9 + 5 =
  26. 26.123456789 × 8 + 9 =
  27. 27.37 × 3 =
  28. 28.12345679 × 72 =
  29. 29.1111 × 1111 =
  30. 30.12345679 × 81 =
  31. 31.11 × 11 =
  32. 32.37 × 18 =
  33. 33.12345679 × 45 =
  34. 34.12345679 × 72 =
  35. 35.37 × 27 =
  36. 36.37 × 15 =
  37. 37.11111 × 11111 =
  38. 38.1234567 × 8 + 7 =
  39. 39.12 × 8 + 2 =
  40. 40.12345679 × 27 =

Answer key

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

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