I also wonder if it might be time to look into EPGY for math. (Would go through an open enrollment group so you don't have to get testing and because I hear it is much much cheaper.). Honestly if you have a 4 year old happily doing double digit addition, I doubt holding him back is the way to go. You might be postponing a battle best fought now. He might be happier & by the time he is in regular school, you will have documentation from Stanford of where he is and why regular unaccelerated math won't cut it.
Just a thought. Fwiw my kiddo is way younger and not tested.
I think this pov makes a lot of sense. I've lost track of what you've said about where he is now, but I did see "probably end of 1st grade maths" a while back, which seems consistent. I've said before and doubtless will say again :-) that IMO/E if they need acceleration, it makes sense that it's a lot easier if they
obviously need acceleration. And it sounds as though you may be in that position - even if your DS learns no more maths between now and when he starts school (you put him in a math deprivation chamber, in DeeDee's wonderful phrase) he's likely still to need special maths, isn't he?
My one slight wondering is related to a thread you started a while back about your DD seeming to be stronger on calculation than conceptually. If you think the same might be true of your DS - he may be able to do things algorithmically, but perhaps not be crazy fast at really grokking them? - then it might make sense to slow him down.
