← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 579 · 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. 1.123456789 × 8 + 9 =
  2. 2.11111 × 11111 =
  3. 3.11 × 11 =
  4. 4.12345679 × 9 =
  5. 5.12 × 8 + 2 =
  6. 6.12345679 × 45 =
  7. 7.37 × 3 =
  8. 8.12345678 × 9 + 9 =
  9. 9.12345679 × 63 =
  10. 10.12345679 × 54 =
  11. 11.37 × 15 =
  12. 12.37 × 18 =
  13. 13.37 × 21 =
  14. 14.12345 × 8 + 5 =
  15. 15.12345679 × 27 =
  16. 16.1234567 × 8 + 7 =
  17. 17.1111 × 1111 =
  18. 18.111 × 111 =
  19. 19.37 × 24 =
  20. 20.12345679 × 81 =
  21. 21.12345678 × 8 + 8 =
  22. 22.1234 × 9 + 5 =
  23. 23.123456 × 9 + 7 =
  24. 24.123 × 9 + 4 =
  25. 25.111111 × 111111 =
  26. 26.123456 × 8 + 6 =
  27. 27.12345679 × 36 =
  28. 28.12345679 × 72 =
  29. 29.37 × 27 =
  30. 30.12345679 × 18 =
  31. 31.1234567 × 9 + 8 =
  32. 32.37 × 6 =
  33. 33.12345679 × 36 =
  34. 34.37 × 12 =
  35. 35.1234 × 8 + 4 =
  36. 36.12345 × 9 + 6 =
  37. 37.37 × 9 =
  38. 38.11111 × 11111 =
  39. 39.111111 × 111111 =
  40. 40.12345679 × 27 =

Answer key

  1. 987654321
  2. 123454321
  3. 121
  4. 111111111
  5. 98
  6. 555555555
  7. 111
  8. 111111111
  9. 777777777
  10. 666666666
  11. 555
  12. 666
  13. 777
  14. 98765
  15. 333333333
  16. 9876543
  17. 1234321
  18. 12321
  19. 888
  20. 999999999
  21. 98765432
  22. 11111
  23. 1111111
  24. 1111
  25. 12345654321
  26. 987654
  27. 444444444
  28. 888888888
  29. 999
  30. 222222222
  31. 11111111
  32. 222
  33. 444444444
  34. 444
  35. 9876
  36. 111111
  37. 333
  38. 123454321
  39. 12345654321
  40. 333333333

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