← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 33 · 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 × 54 =
  2. 2.12345678 × 9 + 9 =
  3. 3.12345 × 9 + 6 =
  4. 4.11111 × 11111 =
  5. 5.12345679 × 72 =
  6. 6.37 × 21 =
  7. 7.12345 × 8 + 5 =
  8. 8.12345679 × 9 =
  9. 9.12345678 × 8 + 8 =
  10. 10.12345679 × 81 =
  11. 11.1234567 × 9 + 8 =
  12. 12.1234 × 9 + 5 =
  13. 13.1234567 × 8 + 7 =
  14. 14.111 × 111 =
  15. 15.37 × 9 =
  16. 16.12345679 × 27 =
  17. 17.12 × 8 + 2 =
  18. 18.12345679 × 18 =
  19. 19.123456 × 9 + 7 =
  20. 20.1111 × 1111 =
  21. 21.123456 × 8 + 6 =
  22. 22.123 × 9 + 4 =
  23. 23.12345679 × 63 =
  24. 24.37 × 27 =
  25. 25.123456789 × 8 + 9 =
  26. 26.12 × 9 + 3 =
  27. 27.37 × 12 =
  28. 28.12345679 × 36 =
  29. 29.37 × 18 =
  30. 30.12345679 × 45 =
  31. 31.111111 × 111111 =
  32. 32.37 × 6 =
  33. 33.12 × 8 + 2 =
  34. 34.37 × 18 =
  35. 35.37 × 3 =
  36. 36.37 × 15 =
  37. 37.111 × 111 =
  38. 38.37 × 24 =
  39. 39.11 × 11 =
  40. 40.1234 × 8 + 4 =

Answer key

  1. 666666666
  2. 111111111
  3. 111111
  4. 123454321
  5. 888888888
  6. 777
  7. 98765
  8. 111111111
  9. 98765432
  10. 999999999
  11. 11111111
  12. 11111
  13. 9876543
  14. 12321
  15. 333
  16. 333333333
  17. 98
  18. 222222222
  19. 1111111
  20. 1234321
  21. 987654
  22. 1111
  23. 777777777
  24. 999
  25. 987654321
  26. 111
  27. 444
  28. 444444444
  29. 666
  30. 555555555
  31. 12345654321
  32. 222
  33. 98
  34. 666
  35. 111
  36. 555
  37. 12321
  38. 888
  39. 121
  40. 9876

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