Brain Tease II for Mac

From Custom Solutions of Maryland:

Brain Tease II is an application that lets you have fun while exercising your brain. Running this application daily should increase your focus, concentration and math skills. There are four levels of difficulty (Easy, Medium, Hard and Very Hard). Three numbers are picked at random for addition, subtraction and division problems. Your challenge is to do as many problems as you can in 90 seconds. Points are awarded for correct answers. Sound is supported. Sound is supported. High scores and settings for level of difficulty and sound are saved between sessions. This application is appropriate (and challenging) for all ages.