← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 685 · 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. 1.1111 × 1111 =
  2. 2.111111 × 111111 =
  3. 3.12 × 9 + 3 =
  4. 4.123456 × 9 + 7 =
  5. 5.37 × 3 =
  6. 6.12345679 × 54 =
  7. 7.37 × 6 =
  8. 8.12345678 × 9 + 9 =
  9. 9.12345679 × 81 =
  10. 10.12345679 × 9 =
  11. 11.111 × 111 =
  12. 12.123 × 8 + 3 =
  13. 13.123 × 9 + 4 =
  14. 14.1234567 × 8 + 7 =
  15. 15.37 × 9 =
  16. 16.12 × 8 + 2 =
  17. 17.123456789 × 8 + 9 =
  18. 18.37 × 27 =
  19. 19.12345 × 9 + 6 =
  20. 20.123456 × 8 + 6 =
  21. 21.37 × 12 =
  22. 22.12345679 × 36 =
  23. 23.12345679 × 27 =
  24. 24.37 × 18 =
  25. 25.37 × 24 =
  26. 26.12345679 × 45 =
  27. 27.12345678 × 8 + 8 =
  28. 28.11 × 11 =
  29. 29.1234 × 9 + 5 =
  30. 30.1234 × 8 + 4 =
  31. 31.37 × 6 =
  32. 32.12345 × 8 + 5 =
  33. 33.12345679 × 18 =
  34. 34.37 × 21 =
  35. 35.1234567 × 9 + 8 =
  36. 36.12345679 × 63 =
  37. 37.12345679 × 72 =
  38. 38.12345679 × 45 =
  39. 39.12345679 × 36 =
  40. 40.11111 × 11111 =

Answer key

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

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