D18992: Kbruch exercise mode improvement

[Christoph Feck]

cfeck added a comment.


  Are you sure a 6th grader can factorize 247? I believe only prime factors 2,3,5,7 should be used, and additionally allowing only a single higher prime factor that is less than 100. E.g. 2*2*2*3*17 is okay, while 17*19 is not.
  
  My students already have a hard time telling that 91 is not prime, because none of the simple divisor rules (2, 3, 5, 4, 9, 10, etc.) leads to the factorization.

REVISION DETAIL
  https://phabricator.kde.org/D18992

To: khanaasif, #kde_edu
Cc: cfeck, narvaez, apol
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