← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 914 · 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. 1.11 × 11 =
  2. 2.111 × 111 =
  3. 3.123 × 9 + 4 =
  4. 4.12 × 9 + 3 =
  5. 5.12345679 × 81 =
  6. 6.12345678 × 8 + 8 =
  7. 7.12345679 × 54 =
  8. 8.37 × 9 =
  9. 9.1234 × 8 + 4 =
  10. 10.12345678 × 9 + 9 =
  11. 11.123456789 × 8 + 9 =
  12. 12.123 × 8 + 3 =
  13. 13.12345 × 8 + 5 =
  14. 14.111111 × 111111 =
  15. 15.12345679 × 9 =
  16. 16.12345 × 9 + 6 =
  17. 17.11111 × 11111 =
  18. 18.37 × 27 =
  19. 19.12 × 8 + 2 =
  20. 20.12345679 × 72 =
  21. 21.12345679 × 18 =
  22. 22.37 × 3 =
  23. 23.123456 × 9 + 7 =
  24. 24.12345679 × 36 =
  25. 25.12345679 × 63 =
  26. 26.12345679 × 27 =
  27. 27.1234567 × 8 + 7 =
  28. 28.12345 × 8 + 5 =
  29. 29.12345678 × 9 + 9 =
  30. 30.37 × 21 =
  31. 31.1234567 × 9 + 8 =
  32. 32.1111 × 1111 =
  33. 33.37 × 18 =
  34. 34.123456 × 8 + 6 =
  35. 35.37 × 12 =
  36. 36.37 × 18 =
  37. 37.11 × 11 =
  38. 38.12345679 × 45 =
  39. 39.37 × 24 =
  40. 40.12345678 × 9 + 9 =

Answer key

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

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