← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 686 · 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. 1.11111 × 11111 =
  2. 2.12345679 × 45 =
  3. 3.37 × 18 =
  4. 4.37 × 24 =
  5. 5.1234567 × 8 + 7 =
  6. 6.12345679 × 54 =
  7. 7.123 × 9 + 4 =
  8. 8.1234 × 8 + 4 =
  9. 9.12345 × 9 + 6 =
  10. 10.111 × 111 =
  11. 11.1234567 × 9 + 8 =
  12. 12.123456 × 9 + 7 =
  13. 13.12345 × 8 + 5 =
  14. 14.12345679 × 81 =
  15. 15.37 × 12 =
  16. 16.12345678 × 8 + 8 =
  17. 17.12345678 × 9 + 9 =
  18. 18.1111 × 1111 =
  19. 19.37 × 9 =
  20. 20.1234 × 9 + 5 =
  21. 21.12 × 9 + 3 =
  22. 22.12345679 × 9 =
  23. 23.123 × 8 + 3 =
  24. 24.12345679 × 72 =
  25. 25.37 × 15 =
  26. 26.12345679 × 27 =
  27. 27.12 × 8 + 2 =
  28. 28.123456 × 8 + 6 =
  29. 29.37 × 27 =
  30. 30.11 × 11 =
  31. 31.12345679 × 18 =
  32. 32.37 × 3 =
  33. 33.123456789 × 8 + 9 =
  34. 34.111111 × 111111 =
  35. 35.37 × 6 =
  36. 36.1234 × 9 + 5 =
  37. 37.12345679 × 63 =
  38. 38.12345679 × 27 =
  39. 39.12345679 × 36 =
  40. 40.123456 × 9 + 7 =

Answer key

  1. 123454321
  2. 555555555
  3. 666
  4. 888
  5. 9876543
  6. 666666666
  7. 1111
  8. 9876
  9. 111111
  10. 12321
  11. 11111111
  12. 1111111
  13. 98765
  14. 999999999
  15. 444
  16. 98765432
  17. 111111111
  18. 1234321
  19. 333
  20. 11111
  21. 111
  22. 111111111
  23. 987
  24. 888888888
  25. 555
  26. 333333333
  27. 98
  28. 987654
  29. 999
  30. 121
  31. 222222222
  32. 111
  33. 987654321
  34. 12345654321
  35. 222
  36. 11111
  37. 777777777
  38. 333333333
  39. 444444444
  40. 1111111

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