← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 316 · 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. 1.12345 × 9 + 6 =
  2. 2.1234567 × 9 + 8 =
  3. 3.12345679 × 81 =
  4. 4.123456 × 8 + 6 =
  5. 5.123 × 9 + 4 =
  6. 6.111 × 111 =
  7. 7.12345679 × 45 =
  8. 8.12345679 × 18 =
  9. 9.123456 × 9 + 7 =
  10. 10.12345679 × 72 =
  11. 11.1111 × 1111 =
  12. 12.12 × 8 + 2 =
  13. 13.11 × 11 =
  14. 14.37 × 6 =
  15. 15.11111 × 11111 =
  16. 16.12345679 × 36 =
  17. 17.12345679 × 27 =
  18. 18.12 × 9 + 3 =
  19. 19.12345678 × 9 + 9 =
  20. 20.37 × 3 =
  21. 21.37 × 12 =
  22. 22.12345 × 8 + 5 =
  23. 23.12345679 × 9 =
  24. 24.123 × 8 + 3 =
  25. 25.1234567 × 8 + 7 =
  26. 26.37 × 18 =
  27. 27.37 × 24 =
  28. 28.1234 × 9 + 5 =
  29. 29.123456789 × 8 + 9 =
  30. 30.111111 × 111111 =
  31. 31.37 × 9 =
  32. 32.37 × 21 =
  33. 33.12345679 × 36 =
  34. 34.12345679 × 54 =
  35. 35.37 × 27 =
  36. 36.37 × 27 =
  37. 37.37 × 12 =
  38. 38.37 × 15 =
  39. 39.37 × 24 =
  40. 40.1234 × 9 + 5 =

Answer key

  1. 111111
  2. 11111111
  3. 999999999
  4. 987654
  5. 1111
  6. 12321
  7. 555555555
  8. 222222222
  9. 1111111
  10. 888888888
  11. 1234321
  12. 98
  13. 121
  14. 222
  15. 123454321
  16. 444444444
  17. 333333333
  18. 111
  19. 111111111
  20. 111
  21. 444
  22. 98765
  23. 111111111
  24. 987
  25. 9876543
  26. 666
  27. 888
  28. 11111
  29. 987654321
  30. 12345654321
  31. 333
  32. 777
  33. 444444444
  34. 666666666
  35. 999
  36. 999
  37. 444
  38. 555
  39. 888
  40. 11111

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