← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 597 · 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. 1.12345678 × 8 + 8 =
  2. 2.12345679 × 45 =
  3. 3.111 × 111 =
  4. 4.12 × 8 + 2 =
  5. 5.1234567 × 9 + 8 =
  6. 6.37 × 15 =
  7. 7.1234 × 9 + 5 =
  8. 8.123456789 × 8 + 9 =
  9. 9.12345679 × 9 =
  10. 10.1234567 × 8 + 7 =
  11. 11.123 × 8 + 3 =
  12. 12.12345 × 9 + 6 =
  13. 13.12345 × 8 + 5 =
  14. 14.11111 × 11111 =
  15. 15.12345679 × 27 =
  16. 16.12345679 × 54 =
  17. 17.12345678 × 9 + 9 =
  18. 18.37 × 24 =
  19. 19.37 × 21 =
  20. 20.37 × 6 =
  21. 21.123 × 9 + 4 =
  22. 22.12345679 × 81 =
  23. 23.123456 × 8 + 6 =
  24. 24.12345679 × 18 =
  25. 25.37 × 3 =
  26. 26.111111 × 111111 =
  27. 27.12345679 × 72 =
  28. 28.1234 × 8 + 4 =
  29. 29.123456 × 9 + 7 =
  30. 30.11 × 11 =
  31. 31.1111 × 1111 =
  32. 32.37 × 9 =
  33. 33.12 × 9 + 3 =
  34. 34.12345679 × 63 =
  35. 35.37 × 27 =
  36. 36.12345679 × 36 =
  37. 37.111111 × 111111 =
  38. 38.12345679 × 63 =
  39. 39.1234 × 8 + 4 =
  40. 40.37 × 18 =

Answer key

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

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