My DS loves maths and likes to do sums for fun. No, I don't get it either. He likes suduko, and I've bought him a book of these. I seem to remember doing something called maths investigations at school in which the aim was to figure stuff out. I'm sure he'd love something like that.
His reading isn't great so ideally I am looking for something that will satisfy his maths love whilst helping him with his reading.
I'm not planning to force him into anything. I am well aware the school hols are coming up. He just loves doing this kind of thing. He also loves gardening, sport and building stuff. We play chess too.