← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 693 · 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. 2.1234567 × 9 + 8 =
  3. 3.12345 × 9 + 6 =
  4. 4.37 × 24 =
  5. 5.111111 × 111111 =
  6. 6.12345678 × 9 + 9 =
  7. 7.123 × 8 + 3 =
  8. 8.12345 × 8 + 5 =
  9. 9.123456789 × 8 + 9 =
  10. 10.1234567 × 8 + 7 =
  11. 11.11 × 11 =
  12. 12.123 × 9 + 4 =
  13. 13.123456 × 8 + 6 =
  14. 14.37 × 21 =
  15. 15.12345679 × 27 =
  16. 16.12345679 × 81 =
  17. 17.37 × 12 =
  18. 18.37 × 15 =
  19. 19.12345679 × 18 =
  20. 20.37 × 9 =
  21. 21.123456 × 9 + 7 =
  22. 22.37 × 3 =
  23. 23.1111 × 1111 =
  24. 24.12345678 × 8 + 8 =
  25. 25.37 × 6 =
  26. 26.12345679 × 72 =
  27. 27.37 × 27 =
  28. 28.12345679 × 45 =
  29. 29.37 × 18 =
  30. 30.1234 × 9 + 5 =
  31. 31.12345679 × 63 =
  32. 32.12 × 8 + 2 =
  33. 33.11111 × 11111 =
  34. 34.111 × 111 =
  35. 35.12345679 × 54 =
  36. 36.12 × 9 + 3 =
  37. 37.12345679 × 9 =
  38. 38.1234 × 8 + 4 =
  39. 39.12 × 8 + 2 =
  40. 40.37 × 3 =

Answer key

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

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