← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 28 · 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 × 81 =
  2. 2.37 × 6 =
  3. 3.11 × 11 =
  4. 4.12345679 × 72 =
  5. 5.12345679 × 18 =
  6. 6.12345678 × 8 + 8 =
  7. 7.37 × 3 =
  8. 8.12345679 × 45 =
  9. 9.11111 × 11111 =
  10. 10.1234567 × 9 + 8 =
  11. 11.12345679 × 27 =
  12. 12.1111 × 1111 =
  13. 13.37 × 12 =
  14. 14.12345679 × 36 =
  15. 15.37 × 18 =
  16. 16.12 × 8 + 2 =
  17. 17.1234 × 8 + 4 =
  18. 18.37 × 24 =
  19. 19.37 × 21 =
  20. 20.37 × 9 =
  21. 21.12345679 × 54 =
  22. 22.1234 × 9 + 5 =
  23. 23.12345 × 9 + 6 =
  24. 24.37 × 15 =
  25. 25.12345678 × 9 + 9 =
  26. 26.12345679 × 9 =
  27. 27.123 × 9 + 4 =
  28. 28.12345679 × 63 =
  29. 29.123456 × 8 + 6 =
  30. 30.37 × 27 =
  31. 31.111111 × 111111 =
  32. 32.12 × 9 + 3 =
  33. 33.123456789 × 8 + 9 =
  34. 34.123 × 8 + 3 =
  35. 35.12345 × 9 + 6 =
  36. 36.11111 × 11111 =
  37. 37.1234 × 9 + 5 =
  38. 38.12345 × 8 + 5 =
  39. 39.1234567 × 8 + 7 =
  40. 40.12345679 × 81 =

Answer key

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

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