← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 370 · 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 × 27 =
  2. 2.37 × 27 =
  3. 3.12345679 × 81 =
  4. 4.1234 × 8 + 4 =
  5. 5.12345679 × 9 =
  6. 6.12345 × 8 + 5 =
  7. 7.1111 × 1111 =
  8. 8.1234567 × 9 + 8 =
  9. 9.111111 × 111111 =
  10. 10.37 × 18 =
  11. 11.12345679 × 45 =
  12. 12.111 × 111 =
  13. 13.123456 × 9 + 7 =
  14. 14.37 × 21 =
  15. 15.12345679 × 54 =
  16. 16.123 × 9 + 4 =
  17. 17.37 × 3 =
  18. 18.37 × 6 =
  19. 19.37 × 12 =
  20. 20.12345 × 9 + 6 =
  21. 21.12345679 × 72 =
  22. 22.123456 × 8 + 6 =
  23. 23.12345678 × 9 + 9 =
  24. 24.12345678 × 8 + 8 =
  25. 25.12 × 8 + 2 =
  26. 26.1234567 × 8 + 7 =
  27. 27.12345679 × 63 =
  28. 28.37 × 15 =
  29. 29.11 × 11 =
  30. 30.123 × 8 + 3 =
  31. 31.12345679 × 9 =
  32. 32.37 × 24 =
  33. 33.12345679 × 36 =
  34. 34.11111 × 11111 =
  35. 35.123456789 × 8 + 9 =
  36. 36.12345679 × 27 =
  37. 37.12345679 × 81 =
  38. 38.12 × 9 + 3 =
  39. 39.1234 × 9 + 5 =
  40. 40.12345679 × 18 =

Answer key

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

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