Hi, I'm looking for a good math book for a 10 year old. He's actually very gifted, as he's able to pick up things like factors and equalities pretty fast. The thing is I'm not a math teacher and I think he needs to go over basic geometry and arithmetic before moving on to algebra, basically there's holes in his knowledge. I've looked at books for his age range and they just teach method and a few that might be better are only available in the U.S. which is a problem living in England and all. I would be grateful for any recommendations.