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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 240 · 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 × 21 =
  2. 2.37 × 27 =
  3. 3.111 × 111 =
  4. 4.1234567 × 8 + 7 =
  5. 5.12345679 × 81 =
  6. 6.12 × 8 + 2 =
  7. 7.12345678 × 8 + 8 =
  8. 8.12 × 9 + 3 =
  9. 9.37 × 15 =
  10. 10.12345679 × 45 =
  11. 11.12345679 × 36 =
  12. 12.12345679 × 27 =
  13. 13.12345679 × 9 =
  14. 14.123456 × 8 + 6 =
  15. 15.111111 × 111111 =
  16. 16.37 × 6 =
  17. 17.37 × 12 =
  18. 18.123456789 × 8 + 9 =
  19. 19.1234567 × 9 + 8 =
  20. 20.123 × 9 + 4 =
  21. 21.12345679 × 72 =
  22. 22.11111 × 11111 =
  23. 23.12345678 × 9 + 9 =
  24. 24.11 × 11 =
  25. 25.123456 × 9 + 7 =
  26. 26.1111 × 1111 =
  27. 27.37 × 3 =
  28. 28.1234 × 9 + 5 =
  29. 29.12345 × 9 + 6 =
  30. 30.12345 × 8 + 5 =
  31. 31.37 × 18 =
  32. 32.12345679 × 63 =
  33. 33.37 × 9 =
  34. 34.37 × 18 =
  35. 35.12345679 × 18 =
  36. 36.37 × 27 =
  37. 37.1234 × 8 + 4 =
  38. 38.123456 × 9 + 7 =
  39. 39.123 × 8 + 3 =
  40. 40.12345679 × 54 =

Answer key

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

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