← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 884 · 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. 1.12345678 × 9 + 9 =
  2. 2.37 × 15 =
  3. 3.12345679 × 36 =
  4. 4.123456 × 9 + 7 =
  5. 5.37 × 27 =
  6. 6.123 × 9 + 4 =
  7. 7.12345679 × 18 =
  8. 8.11 × 11 =
  9. 9.37 × 24 =
  10. 10.12345679 × 9 =
  11. 11.12345679 × 45 =
  12. 12.37 × 3 =
  13. 13.37 × 21 =
  14. 14.37 × 6 =
  15. 15.1234567 × 8 + 7 =
  16. 16.111 × 111 =
  17. 17.37 × 12 =
  18. 18.11111 × 11111 =
  19. 19.123 × 8 + 3 =
  20. 20.12345 × 8 + 5 =
  21. 21.1234 × 9 + 5 =
  22. 22.12345678 × 8 + 8 =
  23. 23.111111 × 111111 =
  24. 24.12 × 9 + 3 =
  25. 25.123456789 × 8 + 9 =
  26. 26.1234567 × 9 + 8 =
  27. 27.12345 × 9 + 6 =
  28. 28.1234 × 8 + 4 =
  29. 29.12345679 × 72 =
  30. 30.12345679 × 54 =
  31. 31.12345679 × 27 =
  32. 32.1111 × 1111 =
  33. 33.12345679 × 63 =
  34. 34.12 × 8 + 2 =
  35. 35.123456 × 8 + 6 =
  36. 36.12345679 × 81 =
  37. 37.37 × 9 =
  38. 38.37 × 27 =
  39. 39.37 × 18 =
  40. 40.11111 × 11111 =

Answer key

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

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