← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 889 · 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. 1.1234567 × 9 + 8 =
  2. 2.12345679 × 81 =
  3. 3.12345679 × 18 =
  4. 4.111 × 111 =
  5. 5.37 × 6 =
  6. 6.12345679 × 27 =
  7. 7.11111 × 11111 =
  8. 8.11 × 11 =
  9. 9.12 × 9 + 3 =
  10. 10.123456 × 9 + 7 =
  11. 11.12345679 × 9 =
  12. 12.12345679 × 63 =
  13. 13.37 × 21 =
  14. 14.12345678 × 9 + 9 =
  15. 15.37 × 12 =
  16. 16.37 × 3 =
  17. 17.37 × 27 =
  18. 18.12345 × 8 + 5 =
  19. 19.123 × 9 + 4 =
  20. 20.123456 × 8 + 6 =
  21. 21.12345679 × 54 =
  22. 22.37 × 9 =
  23. 23.12345679 × 45 =
  24. 24.123456789 × 8 + 9 =
  25. 25.12345 × 9 + 6 =
  26. 26.1234567 × 8 + 7 =
  27. 27.12345679 × 36 =
  28. 28.1111 × 1111 =
  29. 29.37 × 24 =
  30. 30.1234 × 9 + 5 =
  31. 31.37 × 18 =
  32. 32.111 × 111 =
  33. 33.12345679 × 9 =
  34. 34.12345679 × 72 =
  35. 35.111111 × 111111 =
  36. 36.1234 × 8 + 4 =
  37. 37.37 × 15 =
  38. 38.12345679 × 63 =
  39. 39.123 × 8 + 3 =
  40. 40.37 × 12 =

Answer key

  1. 11111111
  2. 999999999
  3. 222222222
  4. 12321
  5. 222
  6. 333333333
  7. 123454321
  8. 121
  9. 111
  10. 1111111
  11. 111111111
  12. 777777777
  13. 777
  14. 111111111
  15. 444
  16. 111
  17. 999
  18. 98765
  19. 1111
  20. 987654
  21. 666666666
  22. 333
  23. 555555555
  24. 987654321
  25. 111111
  26. 9876543
  27. 444444444
  28. 1234321
  29. 888
  30. 11111
  31. 666
  32. 12321
  33. 111111111
  34. 888888888
  35. 12345654321
  36. 9876
  37. 555
  38. 777777777
  39. 987
  40. 444

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