← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 193 · 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. 3.12 × 8 + 2 =
  4. 4.37 × 12 =
  5. 5.37 × 18 =
  6. 6.1234 × 9 + 5 =
  7. 7.11111 × 11111 =
  8. 8.111111 × 111111 =
  9. 9.111 × 111 =
  10. 10.12345679 × 72 =
  11. 11.12345678 × 9 + 9 =
  12. 12.12345 × 8 + 5 =
  13. 13.12345679 × 63 =
  14. 14.12 × 9 + 3 =
  15. 15.1111 × 1111 =
  16. 16.12345678 × 8 + 8 =
  17. 17.12345679 × 45 =
  18. 18.37 × 27 =
  19. 19.12345679 × 54 =
  20. 20.12345679 × 9 =
  21. 21.37 × 9 =
  22. 22.12345679 × 81 =
  23. 23.11 × 11 =
  24. 24.1234 × 8 + 4 =
  25. 25.123456 × 9 + 7 =
  26. 26.37 × 21 =
  27. 27.123 × 8 + 3 =
  28. 28.1234567 × 8 + 7 =
  29. 29.12345679 × 27 =
  30. 30.123456 × 8 + 6 =
  31. 31.123456789 × 8 + 9 =
  32. 32.12345 × 9 + 6 =
  33. 33.37 × 6 =
  34. 34.37 × 24 =
  35. 35.37 × 3 =
  36. 36.37 × 15 =
  37. 37.12345679 × 27 =
  38. 38.1234567 × 9 + 8 =
  39. 39.123456 × 9 + 7 =
  40. 40.37 × 12 =

Answer key

  1. 222222222
  2. 1111
  3. 98
  4. 444
  5. 666
  6. 11111
  7. 123454321
  8. 12345654321
  9. 12321
  10. 888888888
  11. 111111111
  12. 98765
  13. 777777777
  14. 111
  15. 1234321
  16. 98765432
  17. 555555555
  18. 999
  19. 666666666
  20. 111111111
  21. 333
  22. 999999999
  23. 121
  24. 9876
  25. 1111111
  26. 777
  27. 987
  28. 9876543
  29. 333333333
  30. 987654
  31. 987654321
  32. 111111
  33. 222
  34. 888
  35. 111
  36. 555
  37. 333333333
  38. 11111111
  39. 1111111
  40. 444

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