← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 259 · 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. 1.123 × 8 + 3 =
  2. 2.12345678 × 8 + 8 =
  3. 3.12345679 × 81 =
  4. 4.111 × 111 =
  5. 5.37 × 27 =
  6. 6.123456789 × 8 + 9 =
  7. 7.123456 × 9 + 7 =
  8. 8.37 × 21 =
  9. 9.37 × 18 =
  10. 10.12 × 9 + 3 =
  11. 11.12345679 × 45 =
  12. 12.111111 × 111111 =
  13. 13.37 × 24 =
  14. 14.1111 × 1111 =
  15. 15.12345679 × 36 =
  16. 16.11111 × 11111 =
  17. 17.11 × 11 =
  18. 18.12345678 × 9 + 9 =
  19. 19.123 × 9 + 4 =
  20. 20.37 × 6 =
  21. 21.12345 × 9 + 6 =
  22. 22.1234567 × 9 + 8 =
  23. 23.37 × 9 =
  24. 24.12345679 × 27 =
  25. 25.1234 × 9 + 5 =
  26. 26.12345 × 8 + 5 =
  27. 27.12 × 8 + 2 =
  28. 28.12345679 × 9 =
  29. 29.12345679 × 18 =
  30. 30.37 × 3 =
  31. 31.37 × 15 =
  32. 32.1234567 × 8 + 7 =
  33. 33.12345679 × 45 =
  34. 34.12345679 × 54 =
  35. 35.37 × 12 =
  36. 36.12345679 × 72 =
  37. 37.1234 × 8 + 4 =
  38. 38.12345679 × 63 =
  39. 39.123456789 × 8 + 9 =
  40. 40.11111 × 11111 =

Answer key

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

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