← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 856 · 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. 2.12345 × 8 + 5 =
  3. 3.37 × 6 =
  4. 4.12345678 × 9 + 9 =
  5. 5.111111 × 111111 =
  6. 6.37 × 15 =
  7. 7.12345678 × 8 + 8 =
  8. 8.11111 × 11111 =
  9. 9.123 × 8 + 3 =
  10. 10.37 × 21 =
  11. 11.12 × 9 + 3 =
  12. 12.11 × 11 =
  13. 13.1234 × 9 + 5 =
  14. 14.111 × 111 =
  15. 15.1111 × 1111 =
  16. 16.123456 × 8 + 6 =
  17. 17.123 × 9 + 4 =
  18. 18.12345679 × 45 =
  19. 19.12345679 × 9 =
  20. 20.12345679 × 27 =
  21. 21.12345679 × 36 =
  22. 22.123456789 × 8 + 9 =
  23. 23.12345 × 9 + 6 =
  24. 24.37 × 9 =
  25. 25.12345679 × 54 =
  26. 26.1234567 × 8 + 7 =
  27. 27.37 × 18 =
  28. 28.123456 × 9 + 7 =
  29. 29.12 × 8 + 2 =
  30. 30.123456 × 9 + 7 =
  31. 31.37 × 3 =
  32. 32.1234 × 8 + 4 =
  33. 33.12345679 × 81 =
  34. 34.1234567 × 9 + 8 =
  35. 35.12345679 × 63 =
  36. 36.12345679 × 72 =
  37. 37.37 × 12 =
  38. 38.111111 × 111111 =
  39. 39.37 × 24 =
  40. 40.12345679 × 54 =

Answer key

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

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