← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 611 · 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. 1.37 × 9 =
  2. 2.11111 × 11111 =
  3. 3.111 × 111 =
  4. 4.123456 × 9 + 7 =
  5. 5.1234 × 9 + 5 =
  6. 6.37 × 12 =
  7. 7.12345 × 9 + 6 =
  8. 8.12345679 × 9 =
  9. 9.12345679 × 72 =
  10. 10.12345679 × 63 =
  11. 11.37 × 24 =
  12. 12.123 × 8 + 3 =
  13. 13.111111 × 111111 =
  14. 14.12 × 9 + 3 =
  15. 15.12345679 × 27 =
  16. 16.12345679 × 18 =
  17. 17.37 × 3 =
  18. 18.123456 × 8 + 6 =
  19. 19.37 × 21 =
  20. 20.37 × 18 =
  21. 21.12345679 × 45 =
  22. 22.37 × 15 =
  23. 23.12345679 × 81 =
  24. 24.12345678 × 9 + 9 =
  25. 25.12345679 × 36 =
  26. 26.11 × 11 =
  27. 27.123 × 9 + 4 =
  28. 28.12 × 8 + 2 =
  29. 29.1234 × 8 + 4 =
  30. 30.1234567 × 9 + 8 =
  31. 31.12345678 × 8 + 8 =
  32. 32.12345679 × 54 =
  33. 33.1111 × 1111 =
  34. 34.123456789 × 8 + 9 =
  35. 35.12345 × 8 + 5 =
  36. 36.12345679 × 72 =
  37. 37.12345679 × 81 =
  38. 38.37 × 15 =
  39. 39.111111 × 111111 =
  40. 40.37 × 6 =

Answer key

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

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