Helps keep minds active with simple but challenging math drills that test your math skills. Choose the number of math drill questions in increments of 25, 50 or 100. When the problems have all been answered, the user is given a score based upon speed and accuracy of responses. To add a competitive kick, the top three scores are stored in the calculator's memory. Great for anyone who wants to brush up on simple math skills or exercise their brain. Also provides standard calculator functions and a right shift key for easy corrections.