When DD5 is playing on her ipad she will do whatever is fastest to find the answer, rather than actually work out the answer. E.g. in a find-a-word she will just swipe her finger randomly along lines until a word is highlighted, in a maths question with multiple answers she will just tap quickly on all of them until she hits the right one, etc.

Does anyone have any suggestions for ipad apps for young kids, any subject area, that can't be gamed?

Most of the time, if DD5 has her ipad it's because I'm cooking or doing something else, so I'm not available to sit with her and make sure she does things the right way.