← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 673 · 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. 2.12345678 × 9 + 9 =
  3. 3.12345679 × 27 =
  4. 4.111111 × 111111 =
  5. 5.1111 × 1111 =
  6. 6.37 × 3 =
  7. 7.123456 × 8 + 6 =
  8. 8.12345 × 8 + 5 =
  9. 9.12 × 9 + 3 =
  10. 10.12345679 × 63 =
  11. 11.12345679 × 9 =
  12. 12.123 × 8 + 3 =
  13. 13.37 × 6 =
  14. 14.12345679 × 72 =
  15. 15.12 × 8 + 2 =
  16. 16.12345 × 9 + 6 =
  17. 17.12345679 × 36 =
  18. 18.11 × 11 =
  19. 19.1234567 × 9 + 8 =
  20. 20.37 × 24 =
  21. 21.37 × 21 =
  22. 22.37 × 9 =
  23. 23.111 × 111 =
  24. 24.1234 × 9 + 5 =
  25. 25.37 × 18 =
  26. 26.123456 × 9 + 7 =
  27. 27.37 × 15 =
  28. 28.1234567 × 8 + 7 =
  29. 29.123456789 × 8 + 9 =
  30. 30.123 × 9 + 4 =
  31. 31.37 × 12 =
  32. 32.12345679 × 45 =
  33. 33.12345679 × 54 =
  34. 34.1234 × 8 + 4 =
  35. 35.11111 × 11111 =
  36. 36.12345678 × 8 + 8 =
  37. 37.12345679 × 72 =
  38. 38.12345679 × 18 =
  39. 39.12345679 × 72 =
  40. 40.37 × 27 =

Answer key

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

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