Hi DumbledoresGirl
I've just found this thread. Like Dino says my DS1 sounds very like your DS2.
We always say that he was born understanding everything mathematical and that you just seem to need to remind him of things and he understands them instantly.
DS1 is very fortunate though because he has me at school, and I'm the Maths coordinator, and we have a regular G&T maths teacher.
Things that we have in place for DS1 at school that you could suggest to you school are:
Elevation to another year's maths group. DS1 is in the top set in Y5, he should be in the top set in Y6 but our Y6 are not an easy year group this year. I also teach the top set in Year 5 and i'm confident of my own ability to stretch him and keep him interested. There are also a couple of other children in my set who have very similar abilities to him.
We have teacher who works with our able mathematicians in groups once a week on puzzles and problem solving. DS1 also sees him individually once a fortnight and they work on ongoing projects. They keep in touch by email and are working on a project on fractals at the moment.
We have made contact with one of our local secondary schools who support DS1 by doing some individual work with him and by liaising with us with suitable work for him. Because this is the secondary school that he will hopefully attend they will be aware of what his needs will be later on.
It would be useful for the school to contact the borough G&T advisor, they may have some useful suggestions and know of other children in other schools who could share some sort of provision.
Does the school have membership of the Mathematical Association or the Association of Maths Teachers? They are good sources of extension activities and advice.
Does the school take part in the Primary Maths Challenge or the World Class tests? These are not long term fixes for the problem but are at least interesting activities to attempt.
There are excellent courses for teachers run by BEAM on extending higher achievers. They also sell a lot of excellent resources.
I'm now just typing things as they come into my head!
If I think of anything else I'll add it later, but feel free to CAT me.