← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 446 · 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 × 81 =
  2. 2.12345 × 9 + 6 =
  3. 3.37 × 21 =
  4. 4.37 × 6 =
  5. 5.123456789 × 8 + 9 =
  6. 6.1234 × 9 + 5 =
  7. 7.11111 × 11111 =
  8. 8.37 × 27 =
  9. 9.12 × 8 + 2 =
  10. 10.37 × 18 =
  11. 11.12345679 × 18 =
  12. 12.37 × 24 =
  13. 13.1234 × 8 + 4 =
  14. 14.111 × 111 =
  15. 15.12345679 × 27 =
  16. 16.12345679 × 54 =
  17. 17.37 × 9 =
  18. 18.123 × 8 + 3 =
  19. 19.123456 × 9 + 7 =
  20. 20.1111 × 1111 =
  21. 21.12 × 9 + 3 =
  22. 22.123456 × 8 + 6 =
  23. 23.12345678 × 8 + 8 =
  24. 24.11 × 11 =
  25. 25.12345679 × 9 =
  26. 26.123 × 9 + 4 =
  27. 27.12345679 × 45 =
  28. 28.37 × 15 =
  29. 29.12345 × 8 + 5 =
  30. 30.111111 × 111111 =
  31. 31.12345678 × 9 + 9 =
  32. 32.37 × 3 =
  33. 33.12345679 × 63 =
  34. 34.12345679 × 36 =
  35. 35.11111 × 11111 =
  36. 36.1234567 × 8 + 7 =
  37. 37.12 × 9 + 3 =
  38. 38.111 × 111 =
  39. 39.12 × 9 + 3 =
  40. 40.1111 × 1111 =

Answer key

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

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