← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 663 · 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. 1.11 × 11 =
  2. 2.123456 × 8 + 6 =
  3. 3.37 × 9 =
  4. 4.1234567 × 9 + 8 =
  5. 5.123 × 8 + 3 =
  6. 6.123456789 × 8 + 9 =
  7. 7.37 × 15 =
  8. 8.1234567 × 8 + 7 =
  9. 9.1111 × 1111 =
  10. 10.1234 × 8 + 4 =
  11. 11.12345679 × 81 =
  12. 12.12345679 × 9 =
  13. 13.11111 × 11111 =
  14. 14.12 × 8 + 2 =
  15. 15.12345679 × 63 =
  16. 16.12345679 × 18 =
  17. 17.37 × 3 =
  18. 18.12345 × 8 + 5 =
  19. 19.111 × 111 =
  20. 20.37 × 18 =
  21. 21.12345679 × 45 =
  22. 22.37 × 24 =
  23. 23.12 × 9 + 3 =
  24. 24.111111 × 111111 =
  25. 25.123 × 9 + 4 =
  26. 26.12345679 × 27 =
  27. 27.37 × 6 =
  28. 28.37 × 27 =
  29. 29.12345679 × 54 =
  30. 30.12345678 × 8 + 8 =
  31. 31.1234 × 9 + 5 =
  32. 32.12345679 × 36 =
  33. 33.37 × 12 =
  34. 34.37 × 9 =
  35. 35.12345679 × 54 =
  36. 36.37 × 9 =
  37. 37.12345679 × 36 =
  38. 38.123456 × 9 + 7 =
  39. 39.12345 × 9 + 6 =
  40. 40.12345679 × 72 =

Answer key

  1. 121
  2. 987654
  3. 333
  4. 11111111
  5. 987
  6. 987654321
  7. 555
  8. 9876543
  9. 1234321
  10. 9876
  11. 999999999
  12. 111111111
  13. 123454321
  14. 98
  15. 777777777
  16. 222222222
  17. 111
  18. 98765
  19. 12321
  20. 666
  21. 555555555
  22. 888
  23. 111
  24. 12345654321
  25. 1111
  26. 333333333
  27. 222
  28. 999
  29. 666666666
  30. 98765432
  31. 11111
  32. 444444444
  33. 444
  34. 333
  35. 666666666
  36. 333
  37. 444444444
  38. 1111111
  39. 111111
  40. 888888888

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