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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 179 · 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 × 27 =
  2. 2.12345 × 9 + 6 =
  3. 3.37 × 3 =
  4. 4.123 × 8 + 3 =
  5. 5.12345679 × 9 =
  6. 6.37 × 24 =
  7. 7.12 × 9 + 3 =
  8. 8.12345679 × 36 =
  9. 9.11 × 11 =
  10. 10.1111 × 1111 =
  11. 11.111111 × 111111 =
  12. 12.123456 × 9 + 7 =
  13. 13.11111 × 11111 =
  14. 14.12345678 × 8 + 8 =
  15. 15.123 × 9 + 4 =
  16. 16.37 × 21 =
  17. 17.123456 × 8 + 6 =
  18. 18.37 × 15 =
  19. 19.1234 × 8 + 4 =
  20. 20.1234567 × 8 + 7 =
  21. 21.12345679 × 54 =
  22. 22.12345679 × 18 =
  23. 23.1234 × 9 + 5 =
  24. 24.37 × 12 =
  25. 25.123456789 × 8 + 9 =
  26. 26.37 × 27 =
  27. 27.12345678 × 9 + 9 =
  28. 28.12345 × 8 + 5 =
  29. 29.12345679 × 45 =
  30. 30.1234567 × 9 + 8 =
  31. 31.12345679 × 72 =
  32. 32.12345679 × 63 =
  33. 33.111 × 111 =
  34. 34.12 × 8 + 2 =
  35. 35.37 × 9 =
  36. 36.37 × 6 =
  37. 37.37 × 21 =
  38. 38.1234 × 9 + 5 =
  39. 39.12345679 × 36 =
  40. 40.37 × 18 =

Answer key

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

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