"Das Kind geht auf einem Fuß."

[rowan.a.peter]

"The child walks on a toe." how is that a correct solution?

[olimo]

Does it mean he is limping or what?

[LB_StorM]

Probably not. It's sort of like this http://goo.gl/tNd1v but now pretend one of his feet is raised up and he's walking (I guess jumping really) on the other, perhaps playfully.

There's a children's game called hopscotch where you need to do that. http://goo.gl/A0osH

[Danmoller]

Have you never jumped along on one foot just for fun?