← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 415 · 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 × 27 =
  2. 2.1234567 × 8 + 7 =
  3. 3.12345679 × 18 =
  4. 4.111111 × 111111 =
  5. 5.12345678 × 9 + 9 =
  6. 6.11 × 11 =
  7. 7.12345679 × 63 =
  8. 8.12345679 × 81 =
  9. 9.12345679 × 54 =
  10. 10.123456 × 8 + 6 =
  11. 11.37 × 6 =
  12. 12.123456789 × 8 + 9 =
  13. 13.37 × 24 =
  14. 14.11111 × 11111 =
  15. 15.1234 × 9 + 5 =
  16. 16.37 × 3 =
  17. 17.37 × 12 =
  18. 18.12345679 × 45 =
  19. 19.123 × 8 + 3 =
  20. 20.12 × 9 + 3 =
  21. 21.123456 × 9 + 7 =
  22. 22.12345679 × 9 =
  23. 23.111 × 111 =
  24. 24.123 × 9 + 4 =
  25. 25.1111 × 1111 =
  26. 26.37 × 21 =
  27. 27.12345679 × 36 =
  28. 28.1234 × 8 + 4 =
  29. 29.37 × 15 =
  30. 30.37 × 27 =
  31. 31.123 × 8 + 3 =
  32. 32.1234567 × 9 + 8 =
  33. 33.12345 × 9 + 6 =
  34. 34.37 × 18 =
  35. 35.12345678 × 8 + 8 =
  36. 36.12345679 × 72 =
  37. 37.12345 × 8 + 5 =
  38. 38.123456789 × 8 + 9 =
  39. 39.111111 × 111111 =
  40. 40.37 × 9 =

Answer key

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

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