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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 126 · 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. 2.12 × 8 + 2 =
  3. 3.12345679 × 18 =
  4. 4.12345 × 8 + 5 =
  5. 5.12345679 × 27 =
  6. 6.37 × 21 =
  7. 7.37 × 27 =
  8. 8.123 × 8 + 3 =
  9. 9.12345678 × 8 + 8 =
  10. 10.11111 × 11111 =
  11. 11.12345 × 9 + 6 =
  12. 12.12345678 × 9 + 9 =
  13. 13.111111 × 111111 =
  14. 14.123456789 × 8 + 9 =
  15. 15.11 × 11 =
  16. 16.12345679 × 36 =
  17. 17.111 × 111 =
  18. 18.37 × 24 =
  19. 19.1234567 × 9 + 8 =
  20. 20.37 × 18 =
  21. 21.37 × 15 =
  22. 22.1234 × 8 + 4 =
  23. 23.12345679 × 9 =
  24. 24.37 × 3 =
  25. 25.1234 × 9 + 5 =
  26. 26.123456 × 8 + 6 =
  27. 27.12345679 × 81 =
  28. 28.12345679 × 72 =
  29. 29.123 × 9 + 4 =
  30. 30.37 × 12 =
  31. 31.12345679 × 54 =
  32. 32.12 × 9 + 3 =
  33. 33.37 × 9 =
  34. 34.12345679 × 45 =
  35. 35.1234567 × 8 + 7 =
  36. 36.12345679 × 63 =
  37. 37.37 × 21 =
  38. 38.11111 × 11111 =
  39. 39.12345679 × 36 =
  40. 40.37 × 6 =

Answer key

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

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