← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 991 · 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 × 63 =
  2. 2.12345679 × 9 =
  3. 3.37 × 21 =
  4. 4.11 × 11 =
  5. 5.1234 × 8 + 4 =
  6. 6.12 × 8 + 2 =
  7. 7.123 × 9 + 4 =
  8. 8.37 × 12 =
  9. 9.1234567 × 8 + 7 =
  10. 10.37 × 18 =
  11. 11.12345 × 8 + 5 =
  12. 12.111 × 111 =
  13. 13.123 × 8 + 3 =
  14. 14.12345678 × 9 + 9 =
  15. 15.111111 × 111111 =
  16. 16.1111 × 1111 =
  17. 17.123456789 × 8 + 9 =
  18. 18.12345679 × 36 =
  19. 19.12345679 × 18 =
  20. 20.37 × 6 =
  21. 21.12345679 × 27 =
  22. 22.37 × 9 =
  23. 23.12345 × 9 + 6 =
  24. 24.123456 × 8 + 6 =
  25. 25.37 × 3 =
  26. 26.12345679 × 54 =
  27. 27.1234 × 9 + 5 =
  28. 28.12345678 × 8 + 8 =
  29. 29.1234567 × 9 + 8 =
  30. 30.12345679 × 72 =
  31. 31.123456 × 9 + 7 =
  32. 32.11111 × 11111 =
  33. 33.1234567 × 9 + 8 =
  34. 34.12345679 × 81 =
  35. 35.12 × 9 + 3 =
  36. 36.12 × 8 + 2 =
  37. 37.12345679 × 36 =
  38. 38.12345679 × 45 =
  39. 39.12345678 × 9 + 9 =
  40. 40.12 × 9 + 3 =

Answer key

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

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