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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 88 · 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. 1.123456 × 9 + 7 =
  2. 2.37 × 9 =
  3. 3.37 × 27 =
  4. 4.1234 × 8 + 4 =
  5. 5.37 × 21 =
  6. 6.12345679 × 27 =
  7. 7.11 × 11 =
  8. 8.12345679 × 36 =
  9. 9.1111 × 1111 =
  10. 10.123 × 9 + 4 =
  11. 11.12345679 × 9 =
  12. 12.12345679 × 63 =
  13. 13.111 × 111 =
  14. 14.12345 × 8 + 5 =
  15. 15.111111 × 111111 =
  16. 16.12 × 9 + 3 =
  17. 17.12345679 × 45 =
  18. 18.12345679 × 72 =
  19. 19.123456789 × 8 + 9 =
  20. 20.12345678 × 9 + 9 =
  21. 21.12345679 × 18 =
  22. 22.1234 × 9 + 5 =
  23. 23.37 × 12 =
  24. 24.1234567 × 9 + 8 =
  25. 25.12 × 8 + 2 =
  26. 26.123456 × 8 + 6 =
  27. 27.1234567 × 8 + 7 =
  28. 28.37 × 18 =
  29. 29.37 × 24 =
  30. 30.12345679 × 81 =
  31. 31.37 × 6 =
  32. 32.37 × 15 =
  33. 33.123 × 8 + 3 =
  34. 34.11111 × 11111 =
  35. 35.37 × 3 =
  36. 36.12345679 × 54 =
  37. 37.12345679 × 9 =
  38. 38.37 × 15 =
  39. 39.12345 × 9 + 6 =
  40. 40.11 × 11 =

Answer key

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

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