Can anyone recommend a good 'numbers' website for DS to play with?

[Barmymummy]

DS is 4 and resisting doing his letters, sigh. We are working on this and he is making progress but he is much much more inclined and happier to play around with numbers. Can often hear him counting his wall chart thing up to a hundred and is forever pointing numbers out wherever we go.

He is only 4.8 so wondered if there were any good websites that play with basic number skills ie basic addition, subtraction, finding the missing number in a very simple sequence - that sort of thing.

Thanks

Playing number games may appeal to him and teach without him realising.

The 5 year old I nanny likes: Number Twins which is on the Cool Math Games site.

Also look at ICT Games

Cool Math is brilliant and exactly what I had been looking for! UpToTen.com has been brilliant from 2 but DD1 has really grown out of it but keeps playing it anyway. Thanks for the link, nannynick!