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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 603 · 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 × 15 =
  2. 2.12345 × 9 + 6 =
  3. 3.11 × 11 =
  4. 4.12 × 9 + 3 =
  5. 5.12345679 × 36 =
  6. 6.12345679 × 81 =
  7. 7.111111 × 111111 =
  8. 8.12 × 8 + 2 =
  9. 9.1234567 × 8 + 7 =
  10. 10.37 × 3 =
  11. 11.123456 × 8 + 6 =
  12. 12.11111 × 11111 =
  13. 13.1234567 × 9 + 8 =
  14. 14.12345678 × 9 + 9 =
  15. 15.37 × 6 =
  16. 16.123 × 8 + 3 =
  17. 17.12345678 × 8 + 8 =
  18. 18.1234 × 9 + 5 =
  19. 19.12345679 × 45 =
  20. 20.12345679 × 54 =
  21. 21.12345679 × 72 =
  22. 22.1234 × 8 + 4 =
  23. 23.123456 × 9 + 7 =
  24. 24.123456789 × 8 + 9 =
  25. 25.111 × 111 =
  26. 26.37 × 27 =
  27. 27.12345679 × 18 =
  28. 28.123 × 9 + 4 =
  29. 29.12345679 × 9 =
  30. 30.1111 × 1111 =
  31. 31.12345679 × 27 =
  32. 32.37 × 9 =
  33. 33.37 × 24 =
  34. 34.12345 × 8 + 5 =
  35. 35.1234 × 8 + 4 =
  36. 36.12345679 × 63 =
  37. 37.123456 × 8 + 6 =
  38. 38.37 × 21 =
  39. 39.12345679 × 54 =
  40. 40.37 × 12 =

Answer key

  1. 555
  2. 111111
  3. 121
  4. 111
  5. 444444444
  6. 999999999
  7. 12345654321
  8. 98
  9. 9876543
  10. 111
  11. 987654
  12. 123454321
  13. 11111111
  14. 111111111
  15. 222
  16. 987
  17. 98765432
  18. 11111
  19. 555555555
  20. 666666666
  21. 888888888
  22. 9876
  23. 1111111
  24. 987654321
  25. 12321
  26. 999
  27. 222222222
  28. 1111
  29. 111111111
  30. 1234321
  31. 333333333
  32. 333
  33. 888
  34. 98765
  35. 9876
  36. 777777777
  37. 987654
  38. 777
  39. 666666666
  40. 444

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