We used Saxon math 5/4 (for 4th grade) for our oldest child. We ordered these books for our second child this time. In comparison to Saxon Math 3 it was about two grades up in some ways. In other ways it is comparable to what students used to learn for the first time in 9th grade. Saxon Math 5 is more that way. The student is learning the different concepts before they have mastered the basics. Sometimes there seems to be too much given to the student at one time. The reason that I gave a high star review is because it appears that most math curriculum has advanced concepts. I am comparing to the average or common curriculum. Because of this comparison I can say that Saxon Math is well done and better than some others. One of the good parts of the lessons each week is that the student must practice their counting by 3's, 4's, etc.. It takes time and repetition but our children memorize each counting pattern.