← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 347 · 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 × 9 =
  2. 2.37 × 27 =
  3. 3.123 × 9 + 4 =
  4. 4.1234 × 9 + 5 =
  5. 5.12 × 9 + 3 =
  6. 6.123456 × 8 + 6 =
  7. 7.37 × 21 =
  8. 8.123456 × 9 + 7 =
  9. 9.1234 × 8 + 4 =
  10. 10.123 × 8 + 3 =
  11. 11.123456789 × 8 + 9 =
  12. 12.37 × 3 =
  13. 13.12345679 × 45 =
  14. 14.37 × 15 =
  15. 15.11111 × 11111 =
  16. 16.12345679 × 81 =
  17. 17.12345679 × 36 =
  18. 18.111111 × 111111 =
  19. 19.111 × 111 =
  20. 20.37 × 18 =
  21. 21.12345 × 8 + 5 =
  22. 22.37 × 24 =
  23. 23.12345679 × 18 =
  24. 24.12345679 × 54 =
  25. 25.37 × 9 =
  26. 26.11 × 11 =
  27. 27.12345679 × 72 =
  28. 28.12345679 × 27 =
  29. 29.1111 × 1111 =
  30. 30.12345679 × 63 =
  31. 31.37 × 12 =
  32. 32.12345 × 9 + 6 =
  33. 33.1234567 × 9 + 8 =
  34. 34.37 × 6 =
  35. 35.12 × 8 + 2 =
  36. 36.1234567 × 8 + 7 =
  37. 37.12345678 × 9 + 9 =
  38. 38.37 × 24 =
  39. 39.12345678 × 8 + 8 =
  40. 40.123456 × 8 + 6 =

Answer key

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

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