← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 461 · 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 × 18 =
  2. 2.123 × 9 + 4 =
  3. 3.123 × 8 + 3 =
  4. 4.37 × 24 =
  5. 5.11 × 11 =
  6. 6.12345679 × 36 =
  7. 7.12345679 × 45 =
  8. 8.12345679 × 72 =
  9. 9.37 × 9 =
  10. 10.12345679 × 9 =
  11. 11.12345678 × 9 + 9 =
  12. 12.11111 × 11111 =
  13. 13.12 × 8 + 2 =
  14. 14.37 × 15 =
  15. 15.37 × 3 =
  16. 16.123456789 × 8 + 9 =
  17. 17.1234567 × 9 + 8 =
  18. 18.12345 × 8 + 5 =
  19. 19.12345678 × 8 + 8 =
  20. 20.37 × 12 =
  21. 21.1234567 × 8 + 7 =
  22. 22.37 × 21 =
  23. 23.12345 × 9 + 6 =
  24. 24.111111 × 111111 =
  25. 25.37 × 6 =
  26. 26.123456 × 9 + 7 =
  27. 27.111 × 111 =
  28. 28.1111 × 1111 =
  29. 29.12345679 × 63 =
  30. 30.12345679 × 81 =
  31. 31.12 × 9 + 3 =
  32. 32.123456 × 8 + 6 =
  33. 33.12345679 × 27 =
  34. 34.1234 × 8 + 4 =
  35. 35.37 × 18 =
  36. 36.111111 × 111111 =
  37. 37.123456 × 8 + 6 =
  38. 38.37 × 27 =
  39. 39.1234567 × 9 + 8 =
  40. 40.1234 × 9 + 5 =

Answer key

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

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