Gifted Issues Discussion homepage Forums Recommended Resources AOPS Books - Which to buy?

My son is 11 and is finishing chapter 12 of 15 in Number Theory. I also bought the other two sets. He will begin Counting next and then Geometry.

Number Theory started pretty easy for him but as he got into it he was definitely challenged. He covered a 2+ chapters a week at first but it has slowed down now to one chapter per week.

From a brief glance at the other sets I think they will challenge him too.

I just got the books. I didn't realize that the Counting & Probability and the Number Theory books are so thin although I supposed it makes sense since the course is only a couple of months long.

As for the challenge issue, I figured that we would be safe since DS can always do the Alcumus problems set at the difficult levels even if the books turn out easier than I expected. In any event, the books would be a good reference.