← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 691 · 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 × 63 =
  2. 2.12345679 × 36 =
  3. 3.12345 × 8 + 5 =
  4. 4.12345678 × 8 + 8 =
  5. 5.1234567 × 9 + 8 =
  6. 6.1234 × 9 + 5 =
  7. 7.12345679 × 27 =
  8. 8.12345679 × 81 =
  9. 9.12345678 × 9 + 9 =
  10. 10.11 × 11 =
  11. 11.37 × 9 =
  12. 12.37 × 24 =
  13. 13.1111 × 1111 =
  14. 14.12345679 × 45 =
  15. 15.37 × 15 =
  16. 16.37 × 6 =
  17. 17.1234 × 8 + 4 =
  18. 18.111 × 111 =
  19. 19.123 × 9 + 4 =
  20. 20.37 × 27 =
  21. 21.37 × 3 =
  22. 22.123 × 8 + 3 =
  23. 23.11111 × 11111 =
  24. 24.123456 × 9 + 7 =
  25. 25.1234567 × 8 + 7 =
  26. 26.37 × 21 =
  27. 27.123456789 × 8 + 9 =
  28. 28.12345679 × 9 =
  29. 29.12 × 9 + 3 =
  30. 30.12345679 × 54 =
  31. 31.123456 × 8 + 6 =
  32. 32.12345679 × 18 =
  33. 33.12 × 8 + 2 =
  34. 34.111111 × 111111 =
  35. 35.37 × 18 =
  36. 36.12345679 × 72 =
  37. 37.37 × 3 =
  38. 38.11 × 11 =
  39. 39.11 × 11 =
  40. 40.12345 × 9 + 6 =

Answer key

  1. 777777777
  2. 444444444
  3. 98765
  4. 98765432
  5. 11111111
  6. 11111
  7. 333333333
  8. 999999999
  9. 111111111
  10. 121
  11. 333
  12. 888
  13. 1234321
  14. 555555555
  15. 555
  16. 222
  17. 9876
  18. 12321
  19. 1111
  20. 999
  21. 111
  22. 987
  23. 123454321
  24. 1111111
  25. 9876543
  26. 777
  27. 987654321
  28. 111111111
  29. 111
  30. 666666666
  31. 987654
  32. 222222222
  33. 98
  34. 12345654321
  35. 666
  36. 888888888
  37. 111
  38. 121
  39. 121
  40. 111111

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