Nice and cute little game with a pleasant presentation. The audio FX for getting "candy" felt like a nice little reward for correctly solving the presented problems.
To gamify things a little more it would be interesting to have some kind of time pressure added to each of the questions from the houses. Somethin akin to a burning rope countdown from Hearthstone to force faster mental math responses from players and the faster you correctly respond the more candy reward you're able to get. Right now it feels a little too forgiving with infinite time to respond to the prompts.