FreeRice is a great way to keep your kids' brains sharp over the summer months. The quizzes are very easy to use and I like how they return to questions you previously answered wrong to make sure the word or concept has stuck. Lots of subjects to choose from - vocabulary, science, geography, and math.
Looking for other ways to keep kids' minds active this summer? Check out this article -Summer Amnesia: Avoid the Brain Drain.