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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 162 · 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 × 12 =
  2. 2.37 × 6 =
  3. 3.12 × 9 + 3 =
  4. 4.12345 × 8 + 5 =
  5. 5.123456 × 9 + 7 =
  6. 6.37 × 9 =
  7. 7.123456 × 8 + 6 =
  8. 8.1234567 × 9 + 8 =
  9. 9.12345679 × 27 =
  10. 10.12345679 × 36 =
  11. 11.12345679 × 18 =
  12. 12.37 × 21 =
  13. 13.12345679 × 81 =
  14. 14.12345679 × 54 =
  15. 15.12345679 × 72 =
  16. 16.37 × 27 =
  17. 17.11111 × 11111 =
  18. 18.12 × 8 + 2 =
  19. 19.1111 × 1111 =
  20. 20.111 × 111 =
  21. 21.12345678 × 9 + 9 =
  22. 22.37 × 3 =
  23. 23.11 × 11 =
  24. 24.1234 × 9 + 5 =
  25. 25.123 × 9 + 4 =
  26. 26.12345679 × 9 =
  27. 27.123 × 8 + 3 =
  28. 28.12345 × 9 + 6 =
  29. 29.37 × 18 =
  30. 30.111111 × 111111 =
  31. 31.37 × 15 =
  32. 32.1234567 × 8 + 7 =
  33. 33.12345678 × 8 + 8 =
  34. 34.123456789 × 8 + 9 =
  35. 35.12345679 × 63 =
  36. 36.12345679 × 45 =
  37. 37.37 × 24 =
  38. 38.1111 × 1111 =
  39. 39.12345679 × 18 =
  40. 40.1234 × 9 + 5 =

Answer key

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

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