← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 93 · 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. 1.12 × 8 + 2 =
  2. 2.111 × 111 =
  3. 3.12345679 × 27 =
  4. 4.11 × 11 =
  5. 5.12345679 × 18 =
  6. 6.12345679 × 36 =
  7. 7.12345679 × 63 =
  8. 8.123 × 9 + 4 =
  9. 9.12345 × 9 + 6 =
  10. 10.37 × 3 =
  11. 11.12345679 × 81 =
  12. 12.1234567 × 8 + 7 =
  13. 13.111111 × 111111 =
  14. 14.11111 × 11111 =
  15. 15.1234567 × 9 + 8 =
  16. 16.37 × 12 =
  17. 17.37 × 27 =
  18. 18.12345679 × 45 =
  19. 19.123 × 8 + 3 =
  20. 20.37 × 6 =
  21. 21.1111 × 1111 =
  22. 22.123456 × 9 + 7 =
  23. 23.12345679 × 9 =
  24. 24.12345 × 8 + 5 =
  25. 25.37 × 18 =
  26. 26.123456 × 8 + 6 =
  27. 27.1234567 × 8 + 7 =
  28. 28.1234 × 8 + 4 =
  29. 29.37 × 24 =
  30. 30.37 × 9 =
  31. 31.12 × 9 + 3 =
  32. 32.37 × 21 =
  33. 33.1234 × 9 + 5 =
  34. 34.12345678 × 8 + 8 =
  35. 35.12345678 × 9 + 9 =
  36. 36.12345679 × 54 =
  37. 37.123456789 × 8 + 9 =
  38. 38.12 × 8 + 2 =
  39. 39.37 × 15 =
  40. 40.111111 × 111111 =

Answer key

  1. 98
  2. 12321
  3. 333333333
  4. 121
  5. 222222222
  6. 444444444
  7. 777777777
  8. 1111
  9. 111111
  10. 111
  11. 999999999
  12. 9876543
  13. 12345654321
  14. 123454321
  15. 11111111
  16. 444
  17. 999
  18. 555555555
  19. 987
  20. 222
  21. 1234321
  22. 1111111
  23. 111111111
  24. 98765
  25. 666
  26. 987654
  27. 9876543
  28. 9876
  29. 888
  30. 333
  31. 111
  32. 777
  33. 11111
  34. 98765432
  35. 111111111
  36. 666666666
  37. 987654321
  38. 98
  39. 555
  40. 12345654321

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