← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 86 · 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. 1.123 × 8 + 3 =
  2. 2.12 × 8 + 2 =
  3. 3.123456 × 9 + 7 =
  4. 4.123456789 × 8 + 9 =
  5. 5.37 × 18 =
  6. 6.12345679 × 27 =
  7. 7.12 × 9 + 3 =
  8. 8.1234 × 8 + 4 =
  9. 9.12345 × 9 + 6 =
  10. 10.11 × 11 =
  11. 11.12345679 × 72 =
  12. 12.12345679 × 63 =
  13. 13.12345679 × 36 =
  14. 14.12345 × 8 + 5 =
  15. 15.111111 × 111111 =
  16. 16.1234567 × 9 + 8 =
  17. 17.12345678 × 8 + 8 =
  18. 18.12345679 × 81 =
  19. 19.111 × 111 =
  20. 20.37 × 12 =
  21. 21.12345679 × 54 =
  22. 22.123 × 9 + 4 =
  23. 23.37 × 6 =
  24. 24.12345679 × 45 =
  25. 25.12345678 × 9 + 9 =
  26. 26.37 × 24 =
  27. 27.37 × 9 =
  28. 28.37 × 21 =
  29. 29.1234567 × 8 + 7 =
  30. 30.12345679 × 9 =
  31. 31.11111 × 11111 =
  32. 32.1234 × 9 + 5 =
  33. 33.1234 × 9 + 5 =
  34. 34.37 × 3 =
  35. 35.12345679 × 9 =
  36. 36.37 × 15 =
  37. 37.37 × 24 =
  38. 38.1111 × 1111 =
  39. 39.12345679 × 18 =
  40. 40.37 × 9 =

Answer key

  1. 987
  2. 98
  3. 1111111
  4. 987654321
  5. 666
  6. 333333333
  7. 111
  8. 9876
  9. 111111
  10. 121
  11. 888888888
  12. 777777777
  13. 444444444
  14. 98765
  15. 12345654321
  16. 11111111
  17. 98765432
  18. 999999999
  19. 12321
  20. 444
  21. 666666666
  22. 1111
  23. 222
  24. 555555555
  25. 111111111
  26. 888
  27. 333
  28. 777
  29. 9876543
  30. 111111111
  31. 123454321
  32. 11111
  33. 11111
  34. 111
  35. 111111111
  36. 555
  37. 888
  38. 1234321
  39. 222222222
  40. 333

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