← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 487 · 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. 3.12345679 × 63 =
  4. 4.1234567 × 9 + 8 =
  5. 5.12 × 9 + 3 =
  6. 6.37 × 24 =
  7. 7.123 × 8 + 3 =
  8. 8.12345679 × 36 =
  9. 9.11111 × 11111 =
  10. 10.111 × 111 =
  11. 11.123 × 9 + 4 =
  12. 12.37 × 6 =
  13. 13.37 × 21 =
  14. 14.111111 × 111111 =
  15. 15.12345 × 8 + 5 =
  16. 16.12345 × 9 + 6 =
  17. 17.11 × 11 =
  18. 18.12345679 × 45 =
  19. 19.12345679 × 81 =
  20. 20.1111 × 1111 =
  21. 21.1234567 × 8 + 7 =
  22. 22.12345678 × 9 + 9 =
  23. 23.37 × 27 =
  24. 24.12345679 × 9 =
  25. 25.1234 × 8 + 4 =
  26. 26.123456 × 9 + 7 =
  27. 27.123456 × 8 + 6 =
  28. 28.37 × 12 =
  29. 29.12345679 × 18 =
  30. 30.12 × 8 + 2 =
  31. 31.37 × 15 =
  32. 32.12345679 × 72 =
  33. 33.1234 × 9 + 5 =
  34. 34.37 × 3 =
  35. 35.111111 × 111111 =
  36. 36.111111 × 111111 =
  37. 37.123456 × 8 + 6 =
  38. 38.11 × 11 =
  39. 39.37 × 18 =
  40. 40.111 × 111 =

Answer key

  1. 333333333
  2. 987654321
  3. 777777777
  4. 11111111
  5. 111
  6. 888
  7. 987
  8. 444444444
  9. 123454321
  10. 12321
  11. 1111
  12. 222
  13. 777
  14. 12345654321
  15. 98765
  16. 111111
  17. 121
  18. 555555555
  19. 999999999
  20. 1234321
  21. 9876543
  22. 111111111
  23. 999
  24. 111111111
  25. 9876
  26. 1111111
  27. 987654
  28. 444
  29. 222222222
  30. 98
  31. 555
  32. 888888888
  33. 11111
  34. 111
  35. 12345654321
  36. 12345654321
  37. 987654
  38. 121
  39. 666
  40. 12321

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