Few things:

• the src/activities/activities.txt file was not added
• can you also add the alphabetical_order activity (from here: https://github.com/gcompris/GCompris-qt/pull/172/files) along with this diff?

No need to delete the alphabetical_order activity. What I meant was: everything in pull/172 + a GCText element containing the hints (which is there) + the hint bar button will only be available for alphabetical ordering activity only.

Had a quick look at the overall working of the activities, few thoughts:

• The hints should only be for the alphabetical ordering activity and not for the ascending order activity (to be confirmed with @jjazeix ) (since the numbers can be infinite, and the numbers can be > 9).
• The hints should be turned off by default (when the activity starts) so that the user only views it when they are stuck

Looks good, I made few inline comments for some minor changes.

Yes, that will be simpler. I was thinking of creating a generalised function for calculating
the output for any given equations in string format. But I guess it is indeed too complicated
for this problem, thank you.

Fixed in: https://commits.kde.org/gcompris/c18c60e035d0a586561136df160cc3dc6478ed9d

Fixed in: https://commits.kde.org/gcompris/c18c60e035d0a586561136df160cc3dc6478ed9d

Fixed in https://phabricator.kde.org/R2:2c6f55032fa22934941e9b8cce1bcdc14df70840