← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 385 · 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. 2.37 × 24 =
  3. 3.11111 × 11111 =
  4. 4.37 × 6 =
  5. 5.12345679 × 72 =
  6. 6.12345679 × 9 =
  7. 7.12345679 × 45 =
  8. 8.123456 × 8 + 6 =
  9. 9.12345679 × 54 =
  10. 10.123456 × 9 + 7 =
  11. 11.1234567 × 9 + 8 =
  12. 12.111 × 111 =
  13. 13.1234 × 8 + 4 =
  14. 14.123456789 × 8 + 9 =
  15. 15.1111 × 1111 =
  16. 16.111111 × 111111 =
  17. 17.37 × 27 =
  18. 18.37 × 15 =
  19. 19.123 × 9 + 4 =
  20. 20.37 × 18 =
  21. 21.12 × 9 + 3 =
  22. 22.12 × 8 + 2 =
  23. 23.12345679 × 63 =
  24. 24.37 × 3 =
  25. 25.11 × 11 =
  26. 26.12345679 × 36 =
  27. 27.12345678 × 9 + 9 =
  28. 28.1234567 × 8 + 7 =
  29. 29.37 × 12 =
  30. 30.12345 × 9 + 6 =
  31. 31.12345678 × 8 + 8 =
  32. 32.37 × 21 =
  33. 33.12345679 × 81 =
  34. 34.12345679 × 27 =
  35. 35.1234 × 9 + 5 =
  36. 36.37 × 9 =
  37. 37.123 × 8 + 3 =
  38. 38.37 × 27 =
  39. 39.12345679 × 63 =
  40. 40.12345679 × 72 =

Answer key

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

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