It is loaded with 154 fun activities for students K-6. The activities include thinking, reasoning, math, language, writing, listening and remembering. I used it during my student teaching. Here's a fun activity that deals with probability . How about twenty questions.
Trivia games seem to work great.
Especially when you play boys against girls. Have one boy go against one girl. Ask the question, and the first to answer wins a point. Go to a certain number of points. When I was student teaching, we used to make our own up.