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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 271 · 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 × 18 =
  2. 2.123456789 × 8 + 9 =
  3. 3.12 × 8 + 2 =
  4. 4.1111 × 1111 =
  5. 5.123456 × 9 + 7 =
  6. 6.37 × 15 =
  7. 7.37 × 9 =
  8. 8.12345678 × 9 + 9 =
  9. 9.37 × 12 =
  10. 10.123 × 8 + 3 =
  11. 11.12345679 × 36 =
  12. 12.12345 × 9 + 6 =
  13. 13.12345679 × 18 =
  14. 14.123 × 9 + 4 =
  15. 15.111 × 111 =
  16. 16.1234567 × 8 + 7 =
  17. 17.11 × 11 =
  18. 18.1234 × 9 + 5 =
  19. 19.37 × 6 =
  20. 20.37 × 24 =
  21. 21.11111 × 11111 =
  22. 22.12345679 × 27 =
  23. 23.12345 × 8 + 5 =
  24. 24.12345678 × 8 + 8 =
  25. 25.111111 × 111111 =
  26. 26.37 × 21 =
  27. 27.123456 × 8 + 6 =
  28. 28.37 × 3 =
  29. 29.12345679 × 54 =
  30. 30.12345679 × 45 =
  31. 31.1234567 × 9 + 8 =
  32. 32.12345679 × 9 =
  33. 33.1234 × 8 + 4 =
  34. 34.12345679 × 72 =
  35. 35.37 × 12 =
  36. 36.11111 × 11111 =
  37. 37.12 × 9 + 3 =
  38. 38.1234 × 8 + 4 =
  39. 39.12345679 × 54 =
  40. 40.12345679 × 63 =

Answer key

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

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