I bought the Mathshark for my 7-year-old child to practice her math skills. Opened the package, put in the batteries, and tried to use it. Half of the buttons did not work, no matter how hard I pressed. A few other buttons only worked if you pressed them REALLy hard. I was surprised given that we own several other Education Insights products with which we have had no problems. Too bad, a piece of junk.