← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 725 · 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. 2.37 × 3 =
  3. 3.1111 × 1111 =
  4. 4.123 × 8 + 3 =
  5. 5.37 × 18 =
  6. 6.37 × 9 =
  7. 7.37 × 6 =
  8. 8.1234 × 9 + 5 =
  9. 9.12345679 × 81 =
  10. 10.12 × 8 + 2 =
  11. 11.12345679 × 36 =
  12. 12.12345 × 8 + 5 =
  13. 13.37 × 15 =
  14. 14.12345679 × 54 =
  15. 15.123 × 9 + 4 =
  16. 16.12 × 9 + 3 =
  17. 17.12345678 × 8 + 8 =
  18. 18.111 × 111 =
  19. 19.12345679 × 63 =
  20. 20.37 × 27 =
  21. 21.12345 × 9 + 6 =
  22. 22.1234 × 8 + 4 =
  23. 23.12345679 × 18 =
  24. 24.11111 × 11111 =
  25. 25.12345679 × 9 =
  26. 26.37 × 12 =
  27. 27.11 × 11 =
  28. 28.37 × 24 =
  29. 29.123456 × 8 + 6 =
  30. 30.123456789 × 8 + 9 =
  31. 31.12345679 × 72 =
  32. 32.12345679 × 45 =
  33. 33.37 × 21 =
  34. 34.1234567 × 8 + 7 =
  35. 35.37 × 9 =
  36. 36.12345678 × 9 + 9 =
  37. 37.1234567 × 9 + 8 =
  38. 38.11111 × 11111 =
  39. 39.123456 × 9 + 7 =
  40. 40.12345679 × 27 =

Answer key

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

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