← Magic number patterns lesson New set →

Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 99 · 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. 1.37 × 12 =
  2. 2.11111 × 11111 =
  3. 3.11 × 11 =
  4. 4.123 × 8 + 3 =
  5. 5.12345679 × 63 =
  6. 6.1111 × 1111 =
  7. 7.12345679 × 36 =
  8. 8.123456 × 9 + 7 =
  9. 9.111 × 111 =
  10. 10.12345679 × 27 =
  11. 11.12345678 × 9 + 9 =
  12. 12.37 × 24 =
  13. 13.12345678 × 8 + 8 =
  14. 14.37 × 27 =
  15. 15.12345679 × 72 =
  16. 16.12345679 × 9 =
  17. 17.1234567 × 9 + 8 =
  18. 18.123456789 × 8 + 9 =
  19. 19.37 × 6 =
  20. 20.111111 × 111111 =
  21. 21.37 × 21 =
  22. 22.37 × 18 =
  23. 23.12 × 9 + 3 =
  24. 24.12345679 × 81 =
  25. 25.12 × 8 + 2 =
  26. 26.37 × 15 =
  27. 27.37 × 3 =
  28. 28.12345679 × 54 =
  29. 29.12345679 × 18 =
  30. 30.123456 × 8 + 6 =
  31. 31.12345 × 8 + 5 =
  32. 32.123 × 9 + 4 =
  33. 33.12345679 × 45 =
  34. 34.1234567 × 8 + 7 =
  35. 35.37 × 9 =
  36. 36.11111 × 11111 =
  37. 37.12345 × 9 + 6 =
  38. 38.111111 × 111111 =
  39. 39.1234 × 9 + 5 =
  40. 40.12345678 × 9 + 9 =

Answer key

  1. 444
  2. 123454321
  3. 121
  4. 987
  5. 777777777
  6. 1234321
  7. 444444444
  8. 1111111
  9. 12321
  10. 333333333
  11. 111111111
  12. 888
  13. 98765432
  14. 999
  15. 888888888
  16. 111111111
  17. 11111111
  18. 987654321
  19. 222
  20. 12345654321
  21. 777
  22. 666
  23. 111
  24. 999999999
  25. 98
  26. 555
  27. 111
  28. 666666666
  29. 222222222
  30. 987654
  31. 98765
  32. 1111
  33. 555555555
  34. 9876543
  35. 333
  36. 123454321
  37. 111111
  38. 12345654321
  39. 11111
  40. 111111111

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