← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 469 · 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. 1.123456789 × 8 + 9 =
  2. 2.11111 × 11111 =
  3. 3.37 × 27 =
  4. 4.37 × 15 =
  5. 5.12345679 × 72 =
  6. 6.37 × 9 =
  7. 7.12345679 × 27 =
  8. 8.37 × 18 =
  9. 9.12 × 8 + 2 =
  10. 10.1234567 × 9 + 8 =
  11. 11.1111 × 1111 =
  12. 12.1234 × 9 + 5 =
  13. 13.111 × 111 =
  14. 14.12345679 × 36 =
  15. 15.123456 × 8 + 6 =
  16. 16.1234 × 8 + 4 =
  17. 17.123 × 8 + 3 =
  18. 18.12345679 × 54 =
  19. 19.37 × 21 =
  20. 20.12345679 × 9 =
  21. 21.12345678 × 8 + 8 =
  22. 22.12345679 × 18 =
  23. 23.12 × 9 + 3 =
  24. 24.12345679 × 63 =
  25. 25.12345679 × 81 =
  26. 26.111111 × 111111 =
  27. 27.37 × 12 =
  28. 28.123456 × 9 + 7 =
  29. 29.11 × 11 =
  30. 30.12345679 × 9 =
  31. 31.37 × 3 =
  32. 32.12345678 × 9 + 9 =
  33. 33.123 × 9 + 4 =
  34. 34.1234567 × 8 + 7 =
  35. 35.111111 × 111111 =
  36. 36.12345679 × 45 =
  37. 37.37 × 6 =
  38. 38.37 × 24 =
  39. 39.12 × 8 + 2 =
  40. 40.12345 × 8 + 5 =

Answer key

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

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