← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 551 · 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. 1.1234 × 9 + 5 =
  2. 2.12 × 9 + 3 =
  3. 3.1234567 × 9 + 8 =
  4. 4.11 × 11 =
  5. 5.37 × 6 =
  6. 6.12345679 × 18 =
  7. 7.12345 × 9 + 6 =
  8. 8.1234 × 8 + 4 =
  9. 9.123 × 8 + 3 =
  10. 10.12345679 × 27 =
  11. 11.1234567 × 8 + 7 =
  12. 12.37 × 15 =
  13. 13.37 × 21 =
  14. 14.37 × 3 =
  15. 15.123456 × 8 + 6 =
  16. 16.37 × 9 =
  17. 17.12345678 × 9 + 9 =
  18. 18.12 × 8 + 2 =
  19. 19.12345678 × 8 + 8 =
  20. 20.12345679 × 72 =
  21. 21.12345679 × 9 =
  22. 22.12345679 × 45 =
  23. 23.111 × 111 =
  24. 24.123 × 9 + 4 =
  25. 25.12345679 × 81 =
  26. 26.37 × 24 =
  27. 27.11111 × 11111 =
  28. 28.12345679 × 63 =
  29. 29.37 × 18 =
  30. 30.123456 × 9 + 7 =
  31. 31.12345679 × 54 =
  32. 32.12345679 × 36 =
  33. 33.37 × 12 =
  34. 34.1111 × 1111 =
  35. 35.37 × 27 =
  36. 36.37 × 21 =
  37. 37.123456789 × 8 + 9 =
  38. 38.111111 × 111111 =
  39. 39.123456 × 8 + 6 =
  40. 40.12345679 × 36 =

Answer key

  1. 11111
  2. 111
  3. 11111111
  4. 121
  5. 222
  6. 222222222
  7. 111111
  8. 9876
  9. 987
  10. 333333333
  11. 9876543
  12. 555
  13. 777
  14. 111
  15. 987654
  16. 333
  17. 111111111
  18. 98
  19. 98765432
  20. 888888888
  21. 111111111
  22. 555555555
  23. 12321
  24. 1111
  25. 999999999
  26. 888
  27. 123454321
  28. 777777777
  29. 666
  30. 1111111
  31. 666666666
  32. 444444444
  33. 444
  34. 1234321
  35. 999
  36. 777
  37. 987654321
  38. 12345654321
  39. 987654
  40. 444444444

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