SCHOOL ZONE Flash Action -- Addition/Subtraction (Windows/Macintosh) For children ages 6-8, learning proper addition and subtraction skills is very important, because it is the foundation for all mathematics that follow Your child will play games that test their accuracy in adding and subtracting They can compete against the clock to see how many problems they can solve They can even challenge another player The built-in teacher adjusts the difficulty of problems, to keep the challenges hard, and your child's skills sharp