← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 54 · 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 × 81 =
  2. 2.1234567 × 9 + 8 =
  3. 3.12345679 × 45 =
  4. 4.37 × 18 =
  5. 5.12345679 × 54 =
  6. 6.12 × 9 + 3 =
  7. 7.1234 × 8 + 4 =
  8. 8.111111 × 111111 =
  9. 9.37 × 21 =
  10. 10.12345679 × 27 =
  11. 11.111 × 111 =
  12. 12.37 × 6 =
  13. 13.12345678 × 8 + 8 =
  14. 14.1111 × 1111 =
  15. 15.123456789 × 8 + 9 =
  16. 16.37 × 9 =
  17. 17.123 × 8 + 3 =
  18. 18.12345679 × 72 =
  19. 19.1234 × 9 + 5 =
  20. 20.12345679 × 63 =
  21. 21.11 × 11 =
  22. 22.12345679 × 9 =
  23. 23.11111 × 11111 =
  24. 24.37 × 27 =
  25. 25.12345 × 9 + 6 =
  26. 26.1111 × 1111 =
  27. 27.37 × 3 =
  28. 28.123456 × 8 + 6 =
  29. 29.12345679 × 36 =
  30. 30.12345679 × 18 =
  31. 31.12345 × 8 + 5 =
  32. 32.12345678 × 9 + 9 =
  33. 33.37 × 12 =
  34. 34.12345679 × 63 =
  35. 35.1234567 × 8 + 7 =
  36. 36.123456 × 9 + 7 =
  37. 37.37 × 24 =
  38. 38.111 × 111 =
  39. 39.37 × 15 =
  40. 40.12 × 8 + 2 =

Answer key

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

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