← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 376 · 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. 2.37 × 24 =
  3. 3.111 × 111 =
  4. 4.1234 × 8 + 4 =
  5. 5.12 × 8 + 2 =
  6. 6.37 × 27 =
  7. 7.37 × 12 =
  8. 8.123 × 8 + 3 =
  9. 9.12345679 × 81 =
  10. 10.123 × 9 + 4 =
  11. 11.12345679 × 72 =
  12. 12.12345678 × 8 + 8 =
  13. 13.12345679 × 36 =
  14. 14.12345 × 9 + 6 =
  15. 15.12345679 × 27 =
  16. 16.37 × 3 =
  17. 17.12345678 × 9 + 9 =
  18. 18.111111 × 111111 =
  19. 19.123456789 × 8 + 9 =
  20. 20.37 × 21 =
  21. 21.37 × 6 =
  22. 22.37 × 9 =
  23. 23.123456 × 9 + 7 =
  24. 24.11 × 11 =
  25. 25.123456 × 8 + 6 =
  26. 26.12345 × 8 + 5 =
  27. 27.1234 × 9 + 5 =
  28. 28.12 × 9 + 3 =
  29. 29.12345679 × 54 =
  30. 30.37 × 18 =
  31. 31.12345679 × 45 =
  32. 32.11111 × 11111 =
  33. 33.1234567 × 8 + 7 =
  34. 34.1234567 × 9 + 8 =
  35. 35.12345679 × 63 =
  36. 36.1234 × 9 + 5 =
  37. 37.1111 × 1111 =
  38. 38.12345679 × 36 =
  39. 39.37 × 15 =
  40. 40.123 × 9 + 4 =

Answer key

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

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