← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 517 · 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. 2.12345679 × 18 =
  3. 3.12345 × 9 + 6 =
  4. 4.37 × 27 =
  5. 5.11 × 11 =
  6. 6.37 × 18 =
  7. 7.11111 × 11111 =
  8. 8.12345679 × 54 =
  9. 9.12345679 × 72 =
  10. 10.12345678 × 8 + 8 =
  11. 11.123456 × 8 + 6 =
  12. 12.111111 × 111111 =
  13. 13.12 × 9 + 3 =
  14. 14.12345678 × 9 + 9 =
  15. 15.37 × 9 =
  16. 16.1111 × 1111 =
  17. 17.123456789 × 8 + 9 =
  18. 18.12345679 × 36 =
  19. 19.1234567 × 9 + 8 =
  20. 20.1234 × 8 + 4 =
  21. 21.37 × 12 =
  22. 22.123456 × 9 + 7 =
  23. 23.1234 × 9 + 5 =
  24. 24.12345679 × 9 =
  25. 25.123 × 8 + 3 =
  26. 26.37 × 3 =
  27. 27.1234567 × 8 + 7 =
  28. 28.12345 × 8 + 5 =
  29. 29.12345678 × 9 + 9 =
  30. 30.37 × 15 =
  31. 31.12345679 × 45 =
  32. 32.12345679 × 81 =
  33. 33.123456789 × 8 + 9 =
  34. 34.37 × 21 =
  35. 35.12 × 8 + 2 =
  36. 36.12345679 × 63 =
  37. 37.123 × 9 + 4 =
  38. 38.111 × 111 =
  39. 39.37 × 6 =
  40. 40.37 × 24 =

Answer key

  1. 333333333
  2. 222222222
  3. 111111
  4. 999
  5. 121
  6. 666
  7. 123454321
  8. 666666666
  9. 888888888
  10. 98765432
  11. 987654
  12. 12345654321
  13. 111
  14. 111111111
  15. 333
  16. 1234321
  17. 987654321
  18. 444444444
  19. 11111111
  20. 9876
  21. 444
  22. 1111111
  23. 11111
  24. 111111111
  25. 987
  26. 111
  27. 9876543
  28. 98765
  29. 111111111
  30. 555
  31. 555555555
  32. 999999999
  33. 987654321
  34. 777
  35. 98
  36. 777777777
  37. 1111
  38. 12321
  39. 222
  40. 888

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