← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 557 · 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 × 27 =
  2. 2.123456789 × 8 + 9 =
  3. 3.37 × 12 =
  4. 4.11 × 11 =
  5. 5.123 × 8 + 3 =
  6. 6.12345679 × 9 =
  7. 7.12345679 × 81 =
  8. 8.1111 × 1111 =
  9. 9.1234567 × 8 + 7 =
  10. 10.1234 × 9 + 5 =
  11. 11.12 × 8 + 2 =
  12. 12.12345679 × 18 =
  13. 13.111111 × 111111 =
  14. 14.12345679 × 54 =
  15. 15.12345 × 9 + 6 =
  16. 16.12 × 9 + 3 =
  17. 17.37 × 9 =
  18. 18.11111 × 11111 =
  19. 19.12345679 × 36 =
  20. 20.111 × 111 =
  21. 21.123 × 9 + 4 =
  22. 22.1234567 × 9 + 8 =
  23. 23.37 × 3 =
  24. 24.37 × 27 =
  25. 25.37 × 6 =
  26. 26.12345679 × 72 =
  27. 27.12345679 × 45 =
  28. 28.37 × 15 =
  29. 29.37 × 21 =
  30. 30.1234 × 8 + 4 =
  31. 31.12 × 9 + 3 =
  32. 32.12345678 × 9 + 9 =
  33. 33.123456 × 9 + 7 =
  34. 34.12345679 × 63 =
  35. 35.12345679 × 81 =
  36. 36.12345679 × 81 =
  37. 37.37 × 18 =
  38. 38.12345 × 9 + 6 =
  39. 39.11111 × 11111 =
  40. 40.12345678 × 9 + 9 =

Answer key

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

Free maths tricks lessons, practice and worksheets at talentjr.in/maths-tricks