← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 750 · 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. 2.37 × 12 =
  3. 3.111 × 111 =
  4. 4.37 × 18 =
  5. 5.1234 × 9 + 5 =
  6. 6.37 × 27 =
  7. 7.123 × 9 + 4 =
  8. 8.12345679 × 72 =
  9. 9.37 × 3 =
  10. 10.12345679 × 9 =
  11. 11.12 × 8 + 2 =
  12. 12.12345679 × 18 =
  13. 13.1234 × 8 + 4 =
  14. 14.12345678 × 8 + 8 =
  15. 15.12345679 × 27 =
  16. 16.11 × 11 =
  17. 17.37 × 21 =
  18. 18.12 × 9 + 3 =
  19. 19.12345679 × 54 =
  20. 20.123456 × 9 + 7 =
  21. 21.12345 × 8 + 5 =
  22. 22.12345679 × 36 =
  23. 23.123 × 8 + 3 =
  24. 24.111111 × 111111 =
  25. 25.1234567 × 8 + 7 =
  26. 26.12345679 × 45 =
  27. 27.12345679 × 45 =
  28. 28.11111 × 11111 =
  29. 29.1234567 × 9 + 8 =
  30. 30.37 × 6 =
  31. 31.37 × 24 =
  32. 32.12345679 × 81 =
  33. 33.123456 × 8 + 6 =
  34. 34.12345678 × 9 + 9 =
  35. 35.12345679 × 63 =
  36. 36.1111 × 1111 =
  37. 37.123456 × 8 + 6 =
  38. 38.1234567 × 8 + 7 =
  39. 39.12345679 × 72 =
  40. 40.12345679 × 72 =

Answer key

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

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