← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 723 · 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. 2.12345679 × 27 =
  3. 3.11 × 11 =
  4. 4.123456 × 8 + 6 =
  5. 5.37 × 12 =
  6. 6.111111 × 111111 =
  7. 7.37 × 9 =
  8. 8.111 × 111 =
  9. 9.37 × 24 =
  10. 10.12345 × 9 + 6 =
  11. 11.12 × 9 + 3 =
  12. 12.37 × 21 =
  13. 13.12 × 8 + 2 =
  14. 14.37 × 3 =
  15. 15.37 × 6 =
  16. 16.11111 × 11111 =
  17. 17.1234567 × 8 + 7 =
  18. 18.1234 × 8 + 4 =
  19. 19.12345678 × 8 + 8 =
  20. 20.12345679 × 81 =
  21. 21.123 × 9 + 4 =
  22. 22.12345679 × 36 =
  23. 23.1111 × 1111 =
  24. 24.123456789 × 8 + 9 =
  25. 25.12345678 × 9 + 9 =
  26. 26.1234567 × 9 + 8 =
  27. 27.37 × 27 =
  28. 28.12345679 × 72 =
  29. 29.123456 × 9 + 7 =
  30. 30.1234 × 9 + 5 =
  31. 31.37 × 18 =
  32. 32.12345 × 8 + 5 =
  33. 33.12345679 × 54 =
  34. 34.123 × 8 + 3 =
  35. 35.12345679 × 18 =
  36. 36.12345679 × 45 =
  37. 37.12345679 × 63 =
  38. 38.37 × 15 =
  39. 39.1234 × 8 + 4 =
  40. 40.12 × 8 + 2 =

Answer key

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

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