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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 720 · 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. 2.1234 × 9 + 5 =
  3. 3.37 × 12 =
  4. 4.37 × 3 =
  5. 5.12345678 × 8 + 8 =
  6. 6.12345679 × 45 =
  7. 7.37 × 21 =
  8. 8.12 × 9 + 3 =
  9. 9.12345679 × 36 =
  10. 10.123 × 9 + 4 =
  11. 11.12345679 × 81 =
  12. 12.1111 × 1111 =
  13. 13.11 × 11 =
  14. 14.37 × 9 =
  15. 15.12345679 × 54 =
  16. 16.12345679 × 63 =
  17. 17.1234567 × 9 + 8 =
  18. 18.123456 × 9 + 7 =
  19. 19.1234567 × 8 + 7 =
  20. 20.111111 × 111111 =
  21. 21.123456789 × 8 + 9 =
  22. 22.11111 × 11111 =
  23. 23.12345679 × 27 =
  24. 24.37 × 6 =
  25. 25.111 × 111 =
  26. 26.37 × 15 =
  27. 27.12345679 × 9 =
  28. 28.12345679 × 72 =
  29. 29.1234 × 8 + 4 =
  30. 30.123 × 8 + 3 =
  31. 31.12345 × 8 + 5 =
  32. 32.12 × 8 + 2 =
  33. 33.12345678 × 9 + 9 =
  34. 34.12345 × 8 + 5 =
  35. 35.1234 × 8 + 4 =
  36. 36.12345 × 9 + 6 =
  37. 37.12345679 × 27 =
  38. 38.1111 × 1111 =
  39. 39.1234567 × 8 + 7 =
  40. 40.12345679 × 18 =

Answer key

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

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