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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 539 · 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 × 24 =
  2. 2.37 × 21 =
  3. 3.12345679 × 9 =
  4. 4.37 × 18 =
  5. 5.123 × 8 + 3 =
  6. 6.12345679 × 72 =
  7. 7.12345679 × 27 =
  8. 8.1234567 × 9 + 8 =
  9. 9.37 × 12 =
  10. 10.123456789 × 8 + 9 =
  11. 11.12345679 × 18 =
  12. 12.1111 × 1111 =
  13. 13.37 × 9 =
  14. 14.12345 × 9 + 6 =
  15. 15.111 × 111 =
  16. 16.12345678 × 9 + 9 =
  17. 17.123456 × 9 + 7 =
  18. 18.12345679 × 54 =
  19. 19.123 × 9 + 4 =
  20. 20.123456 × 8 + 6 =
  21. 21.37 × 15 =
  22. 22.12345679 × 81 =
  23. 23.12345 × 8 + 5 =
  24. 24.12345679 × 45 =
  25. 25.111111 × 111111 =
  26. 26.11111 × 11111 =
  27. 27.11 × 11 =
  28. 28.12345679 × 36 =
  29. 29.37 × 3 =
  30. 30.12 × 8 + 2 =
  31. 31.37 × 6 =
  32. 32.1234567 × 8 + 7 =
  33. 33.12345679 × 63 =
  34. 34.1234567 × 8 + 7 =
  35. 35.1234 × 8 + 4 =
  36. 36.12 × 9 + 3 =
  37. 37.1234 × 9 + 5 =
  38. 38.12345678 × 8 + 8 =
  39. 39.37 × 18 =
  40. 40.11111 × 11111 =

Answer key

  1. 888
  2. 777
  3. 111111111
  4. 666
  5. 987
  6. 888888888
  7. 333333333
  8. 11111111
  9. 444
  10. 987654321
  11. 222222222
  12. 1234321
  13. 333
  14. 111111
  15. 12321
  16. 111111111
  17. 1111111
  18. 666666666
  19. 1111
  20. 987654
  21. 555
  22. 999999999
  23. 98765
  24. 555555555
  25. 12345654321
  26. 123454321
  27. 121
  28. 444444444
  29. 111
  30. 98
  31. 222
  32. 9876543
  33. 777777777
  34. 9876543
  35. 9876
  36. 111
  37. 11111
  38. 98765432
  39. 666
  40. 123454321

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