← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 818 · 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 × 9 =
  2. 2.1234567 × 9 + 8 =
  3. 3.123 × 8 + 3 =
  4. 4.12345679 × 36 =
  5. 5.12 × 9 + 3 =
  6. 6.123456 × 8 + 6 =
  7. 7.12345678 × 9 + 9 =
  8. 8.1234 × 8 + 4 =
  9. 9.12345678 × 8 + 8 =
  10. 10.12345679 × 54 =
  11. 11.37 × 15 =
  12. 12.37 × 3 =
  13. 13.12345679 × 72 =
  14. 14.37 × 12 =
  15. 15.12345679 × 45 =
  16. 16.37 × 18 =
  17. 17.12 × 8 + 2 =
  18. 18.1234567 × 8 + 7 =
  19. 19.123456 × 9 + 7 =
  20. 20.12345679 × 18 =
  21. 21.11 × 11 =
  22. 22.12345679 × 63 =
  23. 23.12345 × 9 + 6 =
  24. 24.37 × 27 =
  25. 25.37 × 24 =
  26. 26.11111 × 11111 =
  27. 27.12345679 × 27 =
  28. 28.37 × 9 =
  29. 29.111111 × 111111 =
  30. 30.37 × 6 =
  31. 31.12345 × 8 + 5 =
  32. 32.12345 × 8 + 5 =
  33. 33.111 × 111 =
  34. 34.1111 × 1111 =
  35. 35.123456789 × 8 + 9 =
  36. 36.37 × 12 =
  37. 37.123 × 9 + 4 =
  38. 38.11 × 11 =
  39. 39.1234 × 9 + 5 =
  40. 40.12345679 × 9 =

Answer key

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

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