Funny, I could have written the earlier post. My 10 yo, who also still believes in Santa, is doing SM5 with supplementation from Key to Series. SM seems to have worked for her, but we are part of the CC community and Challenge uses Saxon. I was afraid of the transition from Singapore to Saxon, so I have pondered seriously TT pre-Alegrebra for next year with supplemenatation from SM IP or SM Word Problems. Saxon seems incredibly boring to me so I do not know how I would get my 10 yo to sit still for it. What is AoPS? I too, feel like next year -6th grade is pivotal, due to the fact that it is the last step before she approaches much more in depth math. I am still deciding....