← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 739 · 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. 1.12 × 8 + 2 =
  2. 2.12345 × 9 + 6 =
  3. 3.37 × 21 =
  4. 4.11 × 11 =
  5. 5.12345679 × 63 =
  6. 6.123456 × 9 + 7 =
  7. 7.12345678 × 9 + 9 =
  8. 8.123456 × 8 + 6 =
  9. 9.123 × 8 + 3 =
  10. 10.37 × 15 =
  11. 11.111 × 111 =
  12. 12.111111 × 111111 =
  13. 13.12345679 × 18 =
  14. 14.12345679 × 45 =
  15. 15.11111 × 11111 =
  16. 16.12345679 × 81 =
  17. 17.12345679 × 54 =
  18. 18.37 × 24 =
  19. 19.37 × 6 =
  20. 20.12345679 × 36 =
  21. 21.1234567 × 9 + 8 =
  22. 22.12345 × 8 + 5 =
  23. 23.12345678 × 8 + 8 =
  24. 24.37 × 12 =
  25. 25.1234 × 8 + 4 =
  26. 26.1234567 × 8 + 7 =
  27. 27.37 × 27 =
  28. 28.123456789 × 8 + 9 =
  29. 29.1234 × 9 + 5 =
  30. 30.37 × 9 =
  31. 31.12 × 9 + 3 =
  32. 32.37 × 18 =
  33. 33.12345678 × 8 + 8 =
  34. 34.37 × 3 =
  35. 35.12345679 × 72 =
  36. 36.12345679 × 27 =
  37. 37.1111 × 1111 =
  38. 38.123 × 9 + 4 =
  39. 39.12345678 × 9 + 9 =
  40. 40.37 × 15 =

Answer key

  1. 98
  2. 111111
  3. 777
  4. 121
  5. 777777777
  6. 1111111
  7. 111111111
  8. 987654
  9. 987
  10. 555
  11. 12321
  12. 12345654321
  13. 222222222
  14. 555555555
  15. 123454321
  16. 999999999
  17. 666666666
  18. 888
  19. 222
  20. 444444444
  21. 11111111
  22. 98765
  23. 98765432
  24. 444
  25. 9876
  26. 9876543
  27. 999
  28. 987654321
  29. 11111
  30. 333
  31. 111
  32. 666
  33. 98765432
  34. 111
  35. 888888888
  36. 333333333
  37. 1234321
  38. 1111
  39. 111111111
  40. 555

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