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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 189 · 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 × 36 =
  2. 2.12345679 × 63 =
  3. 3.37 × 15 =
  4. 4.37 × 21 =
  5. 5.12345679 × 81 =
  6. 6.12345678 × 8 + 8 =
  7. 7.37 × 3 =
  8. 8.1234567 × 9 + 8 =
  9. 9.111 × 111 =
  10. 10.123 × 8 + 3 =
  11. 11.1234567 × 8 + 7 =
  12. 12.12345679 × 18 =
  13. 13.12345 × 9 + 6 =
  14. 14.11 × 11 =
  15. 15.37 × 12 =
  16. 16.37 × 6 =
  17. 17.12345679 × 45 =
  18. 18.37 × 24 =
  19. 19.1111 × 1111 =
  20. 20.12345679 × 54 =
  21. 21.12345678 × 9 + 9 =
  22. 22.37 × 9 =
  23. 23.111111 × 111111 =
  24. 24.37 × 27 =
  25. 25.1234 × 9 + 5 =
  26. 26.123456 × 9 + 7 =
  27. 27.1234 × 8 + 4 =
  28. 28.12 × 9 + 3 =
  29. 29.37 × 18 =
  30. 30.12345679 × 27 =
  31. 31.12345 × 8 + 5 =
  32. 32.123456789 × 8 + 9 =
  33. 33.12345679 × 9 =
  34. 34.12345679 × 72 =
  35. 35.11111 × 11111 =
  36. 36.12 × 8 + 2 =
  37. 37.37 × 12 =
  38. 38.123 × 9 + 4 =
  39. 39.123456 × 8 + 6 =
  40. 40.12345679 × 63 =

Answer key

  1. 444444444
  2. 777777777
  3. 555
  4. 777
  5. 999999999
  6. 98765432
  7. 111
  8. 11111111
  9. 12321
  10. 987
  11. 9876543
  12. 222222222
  13. 111111
  14. 121
  15. 444
  16. 222
  17. 555555555
  18. 888
  19. 1234321
  20. 666666666
  21. 111111111
  22. 333
  23. 12345654321
  24. 999
  25. 11111
  26. 1111111
  27. 9876
  28. 111
  29. 666
  30. 333333333
  31. 98765
  32. 987654321
  33. 111111111
  34. 888888888
  35. 123454321
  36. 98
  37. 444
  38. 1111
  39. 987654
  40. 777777777

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