← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 975 · 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 × 45 =
  2. 2.1111 × 1111 =
  3. 3.12 × 8 + 2 =
  4. 4.123456 × 9 + 7 =
  5. 5.37 × 21 =
  6. 6.12345679 × 72 =
  7. 7.37 × 27 =
  8. 8.12 × 9 + 3 =
  9. 9.1234 × 9 + 5 =
  10. 10.37 × 9 =
  11. 11.123456789 × 8 + 9 =
  12. 12.12345679 × 27 =
  13. 13.12345679 × 18 =
  14. 14.12345 × 8 + 5 =
  15. 15.12345679 × 63 =
  16. 16.12345679 × 9 =
  17. 17.1234567 × 8 + 7 =
  18. 18.123 × 9 + 4 =
  19. 19.37 × 3 =
  20. 20.11 × 11 =
  21. 21.123456 × 8 + 6 =
  22. 22.12345 × 9 + 6 =
  23. 23.12345678 × 8 + 8 =
  24. 24.1234567 × 9 + 8 =
  25. 25.12345679 × 54 =
  26. 26.111111 × 111111 =
  27. 27.12345679 × 36 =
  28. 28.37 × 15 =
  29. 29.37 × 24 =
  30. 30.37 × 18 =
  31. 31.11111 × 11111 =
  32. 32.1234 × 8 + 4 =
  33. 33.123 × 8 + 3 =
  34. 34.37 × 6 =
  35. 35.111 × 111 =
  36. 36.12345679 × 63 =
  37. 37.12345678 × 9 + 9 =
  38. 38.37 × 12 =
  39. 39.123456789 × 8 + 9 =
  40. 40.123456 × 8 + 6 =

Answer key

  1. 555555555
  2. 1234321
  3. 98
  4. 1111111
  5. 777
  6. 888888888
  7. 999
  8. 111
  9. 11111
  10. 333
  11. 987654321
  12. 333333333
  13. 222222222
  14. 98765
  15. 777777777
  16. 111111111
  17. 9876543
  18. 1111
  19. 111
  20. 121
  21. 987654
  22. 111111
  23. 98765432
  24. 11111111
  25. 666666666
  26. 12345654321
  27. 444444444
  28. 555
  29. 888
  30. 666
  31. 123454321
  32. 9876
  33. 987
  34. 222
  35. 12321
  36. 777777777
  37. 111111111
  38. 444
  39. 987654321
  40. 987654

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