← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 654 · 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. 1.111111 × 111111 =
  2. 2.123 × 8 + 3 =
  3. 3.37 × 9 =
  4. 4.12 × 9 + 3 =
  5. 5.1234 × 9 + 5 =
  6. 6.12345678 × 8 + 8 =
  7. 7.37 × 18 =
  8. 8.1111 × 1111 =
  9. 9.12345679 × 36 =
  10. 10.12 × 8 + 2 =
  11. 11.37 × 6 =
  12. 12.12345679 × 18 =
  13. 13.1234 × 8 + 4 =
  14. 14.12345679 × 45 =
  15. 15.12345 × 8 + 5 =
  16. 16.37 × 27 =
  17. 17.123456789 × 8 + 9 =
  18. 18.1234567 × 9 + 8 =
  19. 19.12345679 × 63 =
  20. 20.123456 × 8 + 6 =
  21. 21.12345679 × 81 =
  22. 22.12345678 × 9 + 9 =
  23. 23.12345 × 9 + 6 =
  24. 24.37 × 12 =
  25. 25.123456 × 9 + 7 =
  26. 26.12345679 × 9 =
  27. 27.12345679 × 54 =
  28. 28.12345679 × 72 =
  29. 29.1234567 × 8 + 7 =
  30. 30.37 × 24 =
  31. 31.11 × 11 =
  32. 32.111 × 111 =
  33. 33.11111 × 11111 =
  34. 34.37 × 15 =
  35. 35.123 × 9 + 4 =
  36. 36.12345679 × 27 =
  37. 37.37 × 21 =
  38. 38.11111 × 11111 =
  39. 39.1234567 × 9 + 8 =
  40. 40.12345 × 9 + 6 =

Answer key

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

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