← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 251 · 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. 1.37 × 9 =
  2. 2.12345679 × 54 =
  3. 3.1234 × 8 + 4 =
  4. 4.37 × 18 =
  5. 5.37 × 12 =
  6. 6.123 × 9 + 4 =
  7. 7.123 × 8 + 3 =
  8. 8.12345679 × 27 =
  9. 9.11 × 11 =
  10. 10.37 × 15 =
  11. 11.1234 × 9 + 5 =
  12. 12.37 × 27 =
  13. 13.12345679 × 45 =
  14. 14.12345678 × 9 + 9 =
  15. 15.11111 × 11111 =
  16. 16.12345679 × 36 =
  17. 17.12345679 × 72 =
  18. 18.12345679 × 18 =
  19. 19.1111 × 1111 =
  20. 20.111111 × 111111 =
  21. 21.37 × 24 =
  22. 22.12345679 × 9 =
  23. 23.12 × 9 + 3 =
  24. 24.123456789 × 8 + 9 =
  25. 25.111 × 111 =
  26. 26.1234567 × 8 + 7 =
  27. 27.1234567 × 9 + 8 =
  28. 28.12345679 × 81 =
  29. 29.37 × 3 =
  30. 30.12345 × 8 + 5 =
  31. 31.123456 × 8 + 6 =
  32. 32.37 × 6 =
  33. 33.12345679 × 63 =
  34. 34.11 × 11 =
  35. 35.37 × 3 =
  36. 36.12345678 × 8 + 8 =
  37. 37.123456 × 9 + 7 =
  38. 38.12345 × 9 + 6 =
  39. 39.123 × 8 + 3 =
  40. 40.12 × 8 + 2 =

Answer key

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

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