← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 176 · 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 × 72 =
  2. 2.12345679 × 9 =
  3. 3.37 × 12 =
  4. 4.12345679 × 45 =
  5. 5.123456 × 9 + 7 =
  6. 6.12345679 × 18 =
  7. 7.12345678 × 8 + 8 =
  8. 8.12345 × 8 + 5 =
  9. 9.12345678 × 9 + 9 =
  10. 10.37 × 21 =
  11. 11.111 × 111 =
  12. 12.11111 × 11111 =
  13. 13.12345 × 9 + 6 =
  14. 14.1234567 × 9 + 8 =
  15. 15.111111 × 111111 =
  16. 16.37 × 18 =
  17. 17.12345679 × 36 =
  18. 18.12345679 × 63 =
  19. 19.37 × 24 =
  20. 20.1234 × 8 + 4 =
  21. 21.12345679 × 81 =
  22. 22.1111 × 1111 =
  23. 23.37 × 3 =
  24. 24.12345679 × 54 =
  25. 25.37 × 27 =
  26. 26.123 × 9 + 4 =
  27. 27.12 × 9 + 3 =
  28. 28.123 × 8 + 3 =
  29. 29.12 × 8 + 2 =
  30. 30.11 × 11 =
  31. 31.1234 × 9 + 5 =
  32. 32.37 × 6 =
  33. 33.123456 × 8 + 6 =
  34. 34.37 × 9 =
  35. 35.12345679 × 27 =
  36. 36.1234567 × 8 + 7 =
  37. 37.12345679 × 72 =
  38. 38.1234 × 9 + 5 =
  39. 39.1111 × 1111 =
  40. 40.12 × 9 + 3 =

Answer key

  1. 888888888
  2. 111111111
  3. 444
  4. 555555555
  5. 1111111
  6. 222222222
  7. 98765432
  8. 98765
  9. 111111111
  10. 777
  11. 12321
  12. 123454321
  13. 111111
  14. 11111111
  15. 12345654321
  16. 666
  17. 444444444
  18. 777777777
  19. 888
  20. 9876
  21. 999999999
  22. 1234321
  23. 111
  24. 666666666
  25. 999
  26. 1111
  27. 111
  28. 987
  29. 98
  30. 121
  31. 11111
  32. 222
  33. 987654
  34. 333
  35. 333333333
  36. 9876543
  37. 888888888
  38. 11111
  39. 1234321
  40. 111

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