← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 286 · 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. 1.123456 × 8 + 6 =
  2. 2.11111 × 11111 =
  3. 3.12345679 × 81 =
  4. 4.111 × 111 =
  5. 5.12345679 × 27 =
  6. 6.37 × 15 =
  7. 7.12345679 × 18 =
  8. 8.111111 × 111111 =
  9. 9.1234 × 8 + 4 =
  10. 10.12345678 × 9 + 9 =
  11. 11.12 × 8 + 2 =
  12. 12.37 × 12 =
  13. 13.12345679 × 9 =
  14. 14.37 × 6 =
  15. 15.12345 × 8 + 5 =
  16. 16.123456 × 9 + 7 =
  17. 17.12345678 × 8 + 8 =
  18. 18.11 × 11 =
  19. 19.12345679 × 63 =
  20. 20.12 × 9 + 3 =
  21. 21.1234567 × 9 + 8 =
  22. 22.12345679 × 45 =
  23. 23.37 × 24 =
  24. 24.123 × 8 + 3 =
  25. 25.37 × 18 =
  26. 26.12345679 × 36 =
  27. 27.12345679 × 54 =
  28. 28.37 × 9 =
  29. 29.1111 × 1111 =
  30. 30.12345678 × 9 + 9 =
  31. 31.37 × 21 =
  32. 32.12 × 9 + 3 =
  33. 33.12345678 × 8 + 8 =
  34. 34.123 × 9 + 4 =
  35. 35.1234567 × 8 + 7 =
  36. 36.37 × 12 =
  37. 37.37 × 27 =
  38. 38.37 × 3 =
  39. 39.1234 × 9 + 5 =
  40. 40.12345 × 9 + 6 =

Answer key

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

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