← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 718 · 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 × 9 + 7 =
  2. 2.123456789 × 8 + 9 =
  3. 3.12345679 × 45 =
  4. 4.111 × 111 =
  5. 5.111111 × 111111 =
  6. 6.1234 × 8 + 4 =
  7. 7.12345679 × 9 =
  8. 8.11111 × 11111 =
  9. 9.37 × 9 =
  10. 10.11 × 11 =
  11. 11.12345679 × 18 =
  12. 12.1234567 × 9 + 8 =
  13. 13.37 × 6 =
  14. 14.123 × 8 + 3 =
  15. 15.12345 × 8 + 5 =
  16. 16.12345 × 9 + 6 =
  17. 17.12345679 × 81 =
  18. 18.12 × 8 + 2 =
  19. 19.37 × 27 =
  20. 20.12 × 9 + 3 =
  21. 21.37 × 15 =
  22. 22.123456 × 8 + 6 =
  23. 23.123 × 9 + 4 =
  24. 24.1234 × 9 + 5 =
  25. 25.37 × 21 =
  26. 26.37 × 18 =
  27. 27.1111 × 1111 =
  28. 28.1234567 × 8 + 7 =
  29. 29.12345679 × 27 =
  30. 30.37 × 12 =
  31. 31.12345679 × 36 =
  32. 32.12345679 × 63 =
  33. 33.12345679 × 54 =
  34. 34.12345678 × 8 + 8 =
  35. 35.1234567 × 9 + 8 =
  36. 36.12345678 × 9 + 9 =
  37. 37.37 × 3 =
  38. 38.37 × 24 =
  39. 39.12345679 × 72 =
  40. 40.12345679 × 81 =

Answer key

  1. 1111111
  2. 987654321
  3. 555555555
  4. 12321
  5. 12345654321
  6. 9876
  7. 111111111
  8. 123454321
  9. 333
  10. 121
  11. 222222222
  12. 11111111
  13. 222
  14. 987
  15. 98765
  16. 111111
  17. 999999999
  18. 98
  19. 999
  20. 111
  21. 555
  22. 987654
  23. 1111
  24. 11111
  25. 777
  26. 666
  27. 1234321
  28. 9876543
  29. 333333333
  30. 444
  31. 444444444
  32. 777777777
  33. 666666666
  34. 98765432
  35. 11111111
  36. 111111111
  37. 111
  38. 888
  39. 888888888
  40. 999999999

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