typing games are a genre that's being renewed and explored - from their origins as learning tools they're moving into a more traditional challenge role - i.e. without the pedagogical component, just a way to provide a mastery barrier to the player.
But, other pedagogical game designs haven't made that leap - no one is solving math problems to get ammo, or word problems to progress in adventure games. Is it because mastery of difficult button combos/dexterity is already an accepted part of game design, e.g. fighting games? Is it because more people played Mavis Beacon growing up than Math Blaster or Search for the Secret Stone? Or is it just that math sucks and isn't ever fun?