← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 637 · 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. 1.111111 × 111111 =
  2. 2.123 × 8 + 3 =
  3. 3.12345679 × 45 =
  4. 4.12345679 × 63 =
  5. 5.12 × 8 + 2 =
  6. 6.123 × 9 + 4 =
  7. 7.12345679 × 27 =
  8. 8.12345 × 9 + 6 =
  9. 9.11111 × 11111 =
  10. 10.37 × 6 =
  11. 11.1234567 × 9 + 8 =
  12. 12.123456 × 8 + 6 =
  13. 13.12345679 × 18 =
  14. 14.12345679 × 72 =
  15. 15.11 × 11 =
  16. 16.12345679 × 54 =
  17. 17.1234567 × 8 + 7 =
  18. 18.37 × 24 =
  19. 19.37 × 9 =
  20. 20.37 × 3 =
  21. 21.12345679 × 9 =
  22. 22.12345678 × 9 + 9 =
  23. 23.37 × 27 =
  24. 24.123456789 × 8 + 9 =
  25. 25.37 × 15 =
  26. 26.37 × 18 =
  27. 27.12345 × 8 + 5 =
  28. 28.1234 × 8 + 4 =
  29. 29.12345678 × 8 + 8 =
  30. 30.1111 × 1111 =
  31. 31.37 × 21 =
  32. 32.123456 × 9 + 7 =
  33. 33.12 × 9 + 3 =
  34. 34.12 × 9 + 3 =
  35. 35.12345679 × 36 =
  36. 36.1234 × 9 + 5 =
  37. 37.12345679 × 81 =
  38. 38.111 × 111 =
  39. 39.12345679 × 36 =
  40. 40.12345679 × 81 =

Answer key

  1. 12345654321
  2. 987
  3. 555555555
  4. 777777777
  5. 98
  6. 1111
  7. 333333333
  8. 111111
  9. 123454321
  10. 222
  11. 11111111
  12. 987654
  13. 222222222
  14. 888888888
  15. 121
  16. 666666666
  17. 9876543
  18. 888
  19. 333
  20. 111
  21. 111111111
  22. 111111111
  23. 999
  24. 987654321
  25. 555
  26. 666
  27. 98765
  28. 9876
  29. 98765432
  30. 1234321
  31. 777
  32. 1111111
  33. 111
  34. 111
  35. 444444444
  36. 11111
  37. 999999999
  38. 12321
  39. 444444444
  40. 999999999

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