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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 366 · 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 × 36 =
  2. 2.1111 × 1111 =
  3. 3.37 × 24 =
  4. 4.37 × 3 =
  5. 5.123 × 8 + 3 =
  6. 6.37 × 15 =
  7. 7.12345679 × 45 =
  8. 8.1234567 × 8 + 7 =
  9. 9.37 × 18 =
  10. 10.37 × 12 =
  11. 11.1234567 × 9 + 8 =
  12. 12.12345678 × 8 + 8 =
  13. 13.123 × 9 + 4 =
  14. 14.12345679 × 54 =
  15. 15.37 × 27 =
  16. 16.12345 × 8 + 5 =
  17. 17.12345679 × 9 =
  18. 18.37 × 9 =
  19. 19.1234 × 8 + 4 =
  20. 20.12345 × 9 + 6 =
  21. 21.11111 × 11111 =
  22. 22.111 × 111 =
  23. 23.37 × 21 =
  24. 24.11 × 11 =
  25. 25.123456 × 8 + 6 =
  26. 26.12345679 × 63 =
  27. 27.12345679 × 27 =
  28. 28.12345679 × 72 =
  29. 29.12345678 × 9 + 9 =
  30. 30.123456789 × 8 + 9 =
  31. 31.12 × 9 + 3 =
  32. 32.1234 × 9 + 5 =
  33. 33.12 × 8 + 2 =
  34. 34.111111 × 111111 =
  35. 35.37 × 6 =
  36. 36.12345679 × 54 =
  37. 37.12345679 × 81 =
  38. 38.123456 × 9 + 7 =
  39. 39.11111 × 11111 =
  40. 40.1234 × 8 + 4 =

Answer key

  1. 444444444
  2. 1234321
  3. 888
  4. 111
  5. 987
  6. 555
  7. 555555555
  8. 9876543
  9. 666
  10. 444
  11. 11111111
  12. 98765432
  13. 1111
  14. 666666666
  15. 999
  16. 98765
  17. 111111111
  18. 333
  19. 9876
  20. 111111
  21. 123454321
  22. 12321
  23. 777
  24. 121
  25. 987654
  26. 777777777
  27. 333333333
  28. 888888888
  29. 111111111
  30. 987654321
  31. 111
  32. 11111
  33. 98
  34. 12345654321
  35. 222
  36. 666666666
  37. 999999999
  38. 1111111
  39. 123454321
  40. 9876

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