Free Learn Addition contains eight lessons on basic addition and you learn them on board the Orbital One space station. To ensure you have grasped the subject 27 tests have been included. Free Learn Addition is the addition topic of Learn Math 3D on Orbital One made in to a fully functional stand alone program. A handy feature is the ability to pick up the 3D numbers and place them onto the board where the answer can be checked automatically. A great feature are the workout lessons these are randomly created sums the student can either answer or watch the computer answer.The tests results can be checked and printed out using the results software included. The programs 3D help section is included but does not contain sound. A large HTML help file and easy to use controls should help the student get up to speed quickly.