When my Kinder GT class learns about “Scientist Thinking” and classification, I like to use a PBS Cyberchase Game called, “Logic Zoo,” which helps them to understand Venn Diagrams. You can find that game, and other fun math problem solving interactives for elementary and middle school students on this page. (You need Flash to play these games, so they probably don’t work on mobile devices.) In addition to “Logic Zoo,” I love, “Pour to Score,” and, “Cyberchase Squares.”
The games are many different levels, so make sure you test them out before assigning them to your students!