← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 122 · 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. 1.12345678 × 9 + 9 =
  2. 2.12345679 × 54 =
  3. 3.11111 × 11111 =
  4. 4.12345678 × 8 + 8 =
  5. 5.1234567 × 9 + 8 =
  6. 6.12345 × 8 + 5 =
  7. 7.12345679 × 36 =
  8. 8.37 × 3 =
  9. 9.111 × 111 =
  10. 10.37 × 18 =
  11. 11.37 × 27 =
  12. 12.37 × 21 =
  13. 13.123 × 9 + 4 =
  14. 14.12345679 × 27 =
  15. 15.12345679 × 18 =
  16. 16.12345 × 9 + 6 =
  17. 17.37 × 15 =
  18. 18.37 × 12 =
  19. 19.1111 × 1111 =
  20. 20.11 × 11 =
  21. 21.12345679 × 72 =
  22. 22.12345679 × 63 =
  23. 23.12 × 9 + 3 =
  24. 24.12345679 × 9 =
  25. 25.123456 × 9 + 7 =
  26. 26.123 × 8 + 3 =
  27. 27.1234567 × 8 + 7 =
  28. 28.12345679 × 81 =
  29. 29.12 × 8 + 2 =
  30. 30.1234 × 8 + 4 =
  31. 31.37 × 9 =
  32. 32.111111 × 111111 =
  33. 33.37 × 24 =
  34. 34.12345679 × 45 =
  35. 35.12345679 × 27 =
  36. 36.123456 × 8 + 6 =
  37. 37.37 × 6 =
  38. 38.123456789 × 8 + 9 =
  39. 39.12345679 × 63 =
  40. 40.12345679 × 9 =

Answer key

  1. 111111111
  2. 666666666
  3. 123454321
  4. 98765432
  5. 11111111
  6. 98765
  7. 444444444
  8. 111
  9. 12321
  10. 666
  11. 999
  12. 777
  13. 1111
  14. 333333333
  15. 222222222
  16. 111111
  17. 555
  18. 444
  19. 1234321
  20. 121
  21. 888888888
  22. 777777777
  23. 111
  24. 111111111
  25. 1111111
  26. 987
  27. 9876543
  28. 999999999
  29. 98
  30. 9876
  31. 333
  32. 12345654321
  33. 888
  34. 555555555
  35. 333333333
  36. 987654
  37. 222
  38. 987654321
  39. 777777777
  40. 111111111

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