Was amazed watching my five-year-old son figure out the problems. And while it would be a stretch to say he "knows the basics of algebra," he certainly has a grasp of how numbers interact. Would like to see them add more problems where you are truly solving for X where the answer is an integer, rather than problems that end up with groupings of letters and numbers. Also, if you end up on one side of the equation with something like 5.3, that it comes up 15. Showing the product like it does with addition and subtraction. On to DragonBox Elements...