← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 705 · 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 × 36 =
  2. 2.37 × 21 =
  3. 3.111 × 111 =
  4. 4.123 × 8 + 3 =
  5. 5.1234 × 8 + 4 =
  6. 6.37 × 18 =
  7. 7.12345679 × 63 =
  8. 8.12 × 8 + 2 =
  9. 9.12345678 × 8 + 8 =
  10. 10.12 × 9 + 3 =
  11. 11.123456789 × 8 + 9 =
  12. 12.12345679 × 54 =
  13. 13.12345679 × 45 =
  14. 14.37 × 6 =
  15. 15.37 × 24 =
  16. 16.1234 × 9 + 5 =
  17. 17.37 × 12 =
  18. 18.123 × 9 + 4 =
  19. 19.12345679 × 72 =
  20. 20.12345679 × 18 =
  21. 21.123456 × 8 + 6 =
  22. 22.37 × 27 =
  23. 23.12345678 × 9 + 9 =
  24. 24.12345 × 9 + 6 =
  25. 25.37 × 9 =
  26. 26.12345679 × 27 =
  27. 27.11 × 11 =
  28. 28.12345679 × 81 =
  29. 29.11111 × 11111 =
  30. 30.1234567 × 9 + 8 =
  31. 31.12345679 × 9 =
  32. 32.111111 × 111111 =
  33. 33.37 × 3 =
  34. 34.123456 × 9 + 7 =
  35. 35.12345 × 8 + 5 =
  36. 36.12345679 × 18 =
  37. 37.11 × 11 =
  38. 38.1234567 × 9 + 8 =
  39. 39.37 × 15 =
  40. 40.1111 × 1111 =

Answer key

  1. 444444444
  2. 777
  3. 12321
  4. 987
  5. 9876
  6. 666
  7. 777777777
  8. 98
  9. 98765432
  10. 111
  11. 987654321
  12. 666666666
  13. 555555555
  14. 222
  15. 888
  16. 11111
  17. 444
  18. 1111
  19. 888888888
  20. 222222222
  21. 987654
  22. 999
  23. 111111111
  24. 111111
  25. 333
  26. 333333333
  27. 121
  28. 999999999
  29. 123454321
  30. 11111111
  31. 111111111
  32. 12345654321
  33. 111
  34. 1111111
  35. 98765
  36. 222222222
  37. 121
  38. 11111111
  39. 555
  40. 1234321

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