Funny, borderline crude, and so very, very British. Excellent overview of addition, subtraction, multiplication and division. Various approaches in thinking and understanding. Great graphics that illustrate and entertain.
Will be greatly enjoyed by boys, those who already love math, and those who enjoy "pictures" amongst the words. But everyone else will be pleasantly entertained, and even learn a thing or two, if not digest the whole book.
Played the games "frazzle or fish food," and "assassins," and the kids loved them.
These books are hard to find in the US. They can be found used, if you're diligent. But check out Ray at HorribleBooks.com in southern California if you want a particular title.