I tried LOF fractions with my son last year and he simply wasn’t ready. He LOVED the stories and we both loved the idea of it, but it was just too difficult. Well, now we see the younger books and are definitely getting them. We use Singapore as our main math program, and we are loving it, and also he is doing SCM’s Pet Store math, and he’ll do the younger LOF books for fun and for all the great things they teach besides math.