← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 522 · 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. 2.12345679 × 45 =
  3. 3.123456789 × 8 + 9 =
  4. 4.12345679 × 18 =
  5. 5.37 × 3 =
  6. 6.12345679 × 27 =
  7. 7.123456 × 8 + 6 =
  8. 8.12345679 × 72 =
  9. 9.37 × 6 =
  10. 10.123 × 9 + 4 =
  11. 11.37 × 12 =
  12. 12.123456 × 9 + 7 =
  13. 13.37 × 24 =
  14. 14.111 × 111 =
  15. 15.12345678 × 9 + 9 =
  16. 16.12345678 × 8 + 8 =
  17. 17.1234567 × 9 + 8 =
  18. 18.111111 × 111111 =
  19. 19.12345 × 9 + 6 =
  20. 20.11 × 11 =
  21. 21.12345679 × 54 =
  22. 22.1234 × 9 + 5 =
  23. 23.123 × 8 + 3 =
  24. 24.12345679 × 63 =
  25. 25.37 × 9 =
  26. 26.1234567 × 8 + 7 =
  27. 27.12345679 × 9 =
  28. 28.12 × 8 + 2 =
  29. 29.1111 × 1111 =
  30. 30.12 × 9 + 3 =
  31. 31.12345679 × 81 =
  32. 32.37 × 21 =
  33. 33.37 × 15 =
  34. 34.11 × 11 =
  35. 35.37 × 18 =
  36. 36.37 × 27 =
  37. 37.12345679 × 27 =
  38. 38.37 × 12 =
  39. 39.12345679 × 72 =
  40. 40.1234 × 8 + 4 =

Answer key

  1. 444444444
  2. 555555555
  3. 987654321
  4. 222222222
  5. 111
  6. 333333333
  7. 987654
  8. 888888888
  9. 222
  10. 1111
  11. 444
  12. 1111111
  13. 888
  14. 12321
  15. 111111111
  16. 98765432
  17. 11111111
  18. 12345654321
  19. 111111
  20. 121
  21. 666666666
  22. 11111
  23. 987
  24. 777777777
  25. 333
  26. 9876543
  27. 111111111
  28. 98
  29. 1234321
  30. 111
  31. 999999999
  32. 777
  33. 555
  34. 121
  35. 666
  36. 999
  37. 333333333
  38. 444
  39. 888888888
  40. 9876

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