.But there was a third group in the study. This group of children also were told “well done, you solved 80% of the questions correctly.” But in addition, this group of kids were praised for their efforts: “You must have tried really hard to get such a high score”.
.."
Here they quote the same study, but claim you ARE supposed to make a big deal about how smart the child is for doing so good on the work and then pile on more praise about the effort too. But this summary is from a commercial website. Still, I have to wonder what the study really said.
http://mathrider.com/how-to-motivate-your-child-to-study-and-learn