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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 994 · 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 × 18 =
  2. 2.37 × 9 =
  3. 3.12345679 × 27 =
  4. 4.37 × 6 =
  5. 5.12345 × 9 + 6 =
  6. 6.12345679 × 9 =
  7. 7.1111 × 1111 =
  8. 8.123 × 9 + 4 =
  9. 9.12345679 × 63 =
  10. 10.111111 × 111111 =
  11. 11.12345678 × 8 + 8 =
  12. 12.123456 × 8 + 6 =
  13. 13.37 × 15 =
  14. 14.12345679 × 72 =
  15. 15.12345 × 8 + 5 =
  16. 16.1234567 × 9 + 8 =
  17. 17.12345679 × 54 =
  18. 18.11 × 11 =
  19. 19.37 × 3 =
  20. 20.123456789 × 8 + 9 =
  21. 21.12345678 × 9 + 9 =
  22. 22.37 × 12 =
  23. 23.12345679 × 45 =
  24. 24.12345679 × 36 =
  25. 25.11111 × 11111 =
  26. 26.123456 × 9 + 7 =
  27. 27.111 × 111 =
  28. 28.37 × 24 =
  29. 29.37 × 18 =
  30. 30.1234 × 8 + 4 =
  31. 31.12345679 × 72 =
  32. 32.12 × 9 + 3 =
  33. 33.12 × 8 + 2 =
  34. 34.1234 × 9 + 5 =
  35. 35.123 × 8 + 3 =
  36. 36.37 × 24 =
  37. 37.1234567 × 9 + 8 =
  38. 38.123456 × 8 + 6 =
  39. 39.37 × 27 =
  40. 40.12 × 8 + 2 =

Answer key

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

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